Workshop Manuals Factory service & repair Ford
Ford Taurus Factory Service Manual (2007)17 · Body
17 · Body & interior

Seats

Make
Ford
Model
Taurus Factory Service Manual
Year
2007
Section
501-10 Seating › Diagnosis and testing › Seats
BodySeats

Seats

Section 501-10 · Diagnosis and testing · revised 03/28/2006

Special Tool(s)
Restraint System Diagnostic Tool (2 required) 418-133 (40-009) Restraint System Diagnostic Tool (2 required)
418-133 (40-009)
Restraint System Diagnostic Tool (2 required) 418-F395 (014-R1079) Restraint System Diagnostic Tool (2 required)
418-F395 (014-R1079)

Restraint System Diagnostic Tool Warning

WARNING: This tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards.

Inspection and Verification

  1. Verify the customer concern by operating the power seat.
  2. Visually inspect for obvious signs of mechanical and electrical damage.
Visual Inspection Chart
Mechanical Electrical
  • Seat mounting hardware
  • Seat track
  • Smart junction box (SJB) fuse 10 (30A)
  • Wiring harness
  • Loose or corroded connectors(s)
  • Seat control switch
  • Seat track motor assembly
  1. If a obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
  2. If the cause is not visually evident, verify the symptom and GO to Symptom Chart.

Symptom Chart

Symptom Chart
Condition Possible Sources Action
  • The power seat is inoperative — driver seat
  • Fuse.
  • Circuit.
  • Seat control switch.
  • The power seat is inoperative — passenger seat
  • Fuse.
  • Circuit.
  • Seat control switch.
  • The power seat moves but is noisy
  • Seat track.
  • The power seat moves but is loose
  • Fastening hardware.
  • Seat track.
  • The power seat does not make full travel
  • Seat track obstructed.
  • The power seat does not move horizontally — driver seat
  • Circuit.
  • Seat control switch.
  • Seat track.
  • The power seat does not move horizontally — passenger seat
  • Circuit.
  • Seat control switch.
  • Seat track.
  • The power seat does not move vertically — driver seat, front height
  • Circuit.
  • Seat control switch.
  • Seat track.
  • The power seat does not move vertically — passenger seat, front height
  • Circuit.
  • Seat control switch.
  • Seat track.
  • The power seat does not move vertically — driver seat, rear height
  • Circuit.
  • Seat control switch.
  • Seat track.
  • The power seat does not move vertically — passenger seat, rear height
  • Circuit.
  • Seat control switch.
  • Seat track.

Pinpoint Tests

WARNING: Always wear safety glasses when repairing an air bag supplemental restraint system (SRS) vehicle and when handling an airbag module. This will reduce the risk of injury in the event of an accidental deployment.

WARNING: Never probe the connectors on the air bag module. Doing so can result in air bag deployment, which can result in personal injury.

Refer to Inspection and Verification and the Symptom Chart for direction to the appropriate Pinpoint Test.

Pinpoint Test A: The Power Seat Is Inoperative — Driver Seat

Refer to Wiring Diagrams Cell 120, Power Seats for schematic and connector information.

Refer to Wiring Diagrams Cell 149, Component Testing for schematic and connector information.

Normal Operation

The seat control switch is powered by battery voltage to circuit 490 (RD) and is supplied ground on circuit 57 (BK). The seat control switch applies battery power and ground directly to one of 3 bi-directional seat track motors, respectively, to move the seat. Toggling the seat control switch to the opposite position reverses the voltage polarity applied to the respective seat motor and moves the seat in the opposite direction.

Possible Causes

An inoperative driver power seat can be caused by:

  • fuse.
  • circuit 490 (RD) open.
  • circuit 57 (BK) open.
  • a faulty seat control switch.

PINPOINT TEST A: THE POWER SEAT IS INOPERATIVE — DRIVER SEAT

Test Step Result / Action to Take
A1 CHECK FOR VOLTAGE AT THE SEAT CONTROL SWITCH
    WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.
  • For vehicles equipped with seat side air bags, carry out the following:
    • Disconnect driver seat side air bag C314.
    • Connect restraint system diagnostic tool 418-133 to driver seat side air bag C314.
    • Disconnect the driver seat safety belt buckle pretensioner electrical connector at the pretensioner.
    • Connect restraint system diagnostic tool 418-F395 to the driver seat safety belt buckle pretensioner electrical connector.
  • WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
  • Connect the battery ground cable.
  • Disconnect: Seat Control Switch C360.
  • Measure the voltage between seat control switch C360-7, circuit 490 (RD), harness side and ground.
    • Yes GO to A2 . No VERIFY the smart junction box (SJB) fuse 10 (30A) is OK. If OK
  • Is the voltage greater than 10 volts?
 Yes
GO to A2.

No
VERIFY the smart junction box (SJB) fuse 10 (30A) is OK. If OK, REPAIR circuit 490 (RD). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the driver seat safety belt buckle pretensioner electrical connector. CONNECT the driver seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C314. CONNECT driver seat side air bag module C314.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.
A2 CHECK CIRCUIT 57 (BK) FOR AN OPEN
  • Measure the resistance between seat control switch C360-1, circuit 57 (BK), harness side and ground.
    • Yes GO to A3 . No REPAIR circuit 57 (BK). TEST the system for normal operation.
  • Is the resistance less than 5 ohms?
 Yes
GO to A3.

No
REPAIR circuit 57 (BK). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the driver seat safety belt buckle pretensioner electrical connector. CONNECT the driver seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C314. CONNECT driver seat side air bag module C314.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.
A3 CHECK THE SEAT CONTROL SWITCH
  • Carry out the seat control switch component test.

    Refer to Wiring Diagrams Cell 149 for schematic and connector information.

  • Did the seat control switch pass the component test?
 Yes
CHECK for an obstructed or binding seat track. If no obstruction or binding is found, INSTALL a new seat track. REFER to Seat Track — Power in this section. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the driver seat safety belt buckle pretensioner electrical connector. CONNECT the driver seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C314. CONNECT driver seat side air bag module C314.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.

No
INSTALL a new seat control switch. TEST the system for normal operation. For all vehicles, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the driver seat safety belt buckle pretensioner electrical connector. CONNECT the driver seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C314. CONNECT driver seat side air bag module C314.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.

Pinpoint Test B: The Power Seat Is Inoperative — Passenger Seat

Refer to Wiring Diagrams Cell 120, Power Seats for schematic and connector information.

Refer to Wiring Diagrams Cell 149, Component Testing for schematic and connector information.

Normal Operation

The seat control switch is powered by battery voltage to circuit 490 (RD) and is supplied ground on circuit 57 (BK). The seat control switch applies battery power and ground directly to one of 3 bi-directional seat track motors, respectively, to move the seat. Toggling the seat control switch to the opposite position reverses the voltage polarity applied to the respective seat motor and moves the seat in the opposite direction.

Possible Causes

An inoperative passenger power seat can be caused by:

  • fuse.
  • circuit 490 (RD) open.
  • circuit 57 (BK) open.
  • a faulty seat control switch.

PINPOINT TEST B: THE POWER SEAT IS INOPERATIVE — PASSENGER SEAT

Test Step Result / Action to Take
B1 CHECK FOR VOLTAGE AT THE SEAT CONTROL SWITCH
    WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.
  • For vehicles equipped with seat side air bags, carry out the following:
    • Disconnect passenger seat side air bag C316.
    • Connect restraint system diagnostic tool 418-133 to passenger seat side air bag C316.
    • Disconnect passenger seat safety belt buckle pretensioner electrical connector at the pretensioner.
    • Connect restraint system diagnostic tool 418-F395 to passenger seat safety belt buckle pretensioner electrical connector.
  • WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
  • Connect the battery ground cable.
  • Disconnect: Seat Control Switch C330.
  • Measure the voltage between seat control switch C330-7, circuit 490 (RD), harness side and ground.
    • Yes GO to B2 . No VERIFY the smart junction box (SJB) fuse 10 (30A) is OK. If OK
  • Is the voltage greater than 10 volts?
 Yes
GO to B2.

No
VERIFY the smart junction box (SJB) fuse 10 (30A) is OK. If OK, REPAIR circuit 490 (RD). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the passenger seat safety belt buckle pretensioner electrical connector. CONNECT the passenger seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.
B2 CHECK CIRCUIT 57 (BK) FOR AN OPEN
  • Measure the resistance between seat control switch C330-1, circuit 57 (BK), harness side and ground.
    • Yes GO to B3 . No REPAIR circuit 57 (BK). TEST the system for normal operation.
  • Is the resistance less than 5 ohms?
 Yes
GO to B3.

No
REPAIR circuit 57 (BK). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the passenger seat safety belt buckle pretensioner electrical connector. CONNECT the passenger seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.
B3 CHECK THE SEAT CONTROL SWITCH
  • Carry out the seat control switch component test.

    Refer to Wiring Diagrams Cell 149 for schematic and connector information.

  • Did the seat control switch pass the component test?
 Yes
CHECK for an obstructed or binding seat track. If no obstruction or binding is found, INSTALL a new seat track. REFER to Seat Track — Power in this section. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the passenger seat safety belt buckle pretensioner electrical connector. CONNECT the passenger seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.

No
INSTALL a new seat control switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the passenger seat safety belt buckle pretensioner electrical connector. CONNECT the passenger seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.

Pinpoint Test C: The Power Seat Moves But Is Noisy

Normal Operation

The power seat should move quietly during operation. Some noise is acceptable.

Possible Causes

A noisy power seat can be caused by:

  • a misaligned seat track.
  • a faulty seat track component.
  • an object obstructing seat movement.

PINPOINT TEST C: THE POWER SEAT MOVES BUT IS NOISY

Test Step Result / Action to Take
C1 CHECK THE TRACK ALIGNMENT
    WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.
  • For vehicles equipped with seat side air bags, carry out the following:
    • Disconnect affected seat side air bag C314 (driver) or C316 (passenger).
    • Connect restraint system diagnostic tool 418-133 to affected seat side air bag C314 (driver) or C316 (passenger).
    • Disconnect the affected seat driver or passenger safety belt buckle pretensioner electrical connector at the pretensioner.
    • Connect restraint system diagnostic tool 418-F395 to the affected seat driver or passenger safety belt buckle pretensioner electrical connector.
  • WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
  • Connect the battery ground cable.
  • Check the alignment of the track to the floor and the track to the seat.
  • Is the track out of alignment?
 Yes
ALIGN the track to the seat and the floor. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the driver or passenger seat safety belt buckle pretensioner electrical connector. CONNECT the driver or passenger seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C314 or passenger seat side air bag module C316. CONNECT driver seat side air bag module C314 or passenger seat side air bag module C316.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.

No
INSTALL a new power seat track. REFER to Seat Track — Power in this section. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the driver or passenger seat safety belt buckle pretensioner electrical connector. CONNECT the driver or passenger seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C314 or passenger seat side air bag module C316. CONNECT driver seat side air bag module C314 or passenger seat side air bag module C316.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.

Pinpoint Test D: The Power Seat Moves But Is Loose

Normal Operation

The power seat movement should be smooth and the seat cushion should not rock during or after operation.

Possible Causes

A loose power seat can be caused by:

  • loose seat fastening hardware.
  • a faulty seat track component.

PINPOINT TEST D: THE POWER SEAT MOVES BUT IS LOOSE

Test Step Result / Action to Take
D1 CHECK THE FASTENING HARDWARE
    WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.
  • For vehicles equipped with seat side air bags, carry out the following:
    • Disconnect affected seat side air bag C314 (driver) or C316 (passenger).
    • Connect restraint system diagnostic tool 418-133 to affected seat side air bag C314 (driver) or C316 (passenger).
    • Disconnect the affected seat driver or passenger safety belt buckle pretensioner electrical connector at the pretensioner.
    • Connect restraint system diagnostic tool 418-F395 to the affected seat driver or passenger safety belt buckle pretensioner electrical connector.
  • WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
  • Connect the battery ground cable.
  • Check the seat fastening hardware.
  • Is the fastening hardware loose?
 Yes
TIGHTEN all fastening hardware to specification. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the driver or passenger seat safety belt buckle pretensioner electrical connector. CONNECT the driver or passenger seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C314 or passenger seat side air bag module C316. CONNECT driver seat side air bag module C314 or passenger seat side air bag module C316.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.

No
INSTALL a new seat track. REFER to Seat Track — Power in this section. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the driver or passenger seat safety belt buckle pretensioner electrical connector. CONNECT the driver or passenger seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C314 or passenger seat side air bag module C316. CONNECT driver seat side air bag module C314 or passenger seat side air bag module C316.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.

Pinpoint Test E: The Power Seat Does Not Make Full Travel

Normal Operation

The driver power seat should travel fully horizontal (FORWARD/REARWARD) and vertical (front UP/DOWN and rear UP/DOWN). The passenger power seat should travel fully horizontal (FORWARD/REARWARD).

Possible Causes

A power seat that does not make full travel can be caused by:

  • an obstructed seat track.
  • a faulty seat track component.

PINPOINT TEST E: THE POWER SEAT DOES NOT MAKE FULL TRAVEL

Test Step Result / Action to Take
E1 CHECK FOR AN OBSTRUCTION IN THE SEAT TRACK
    WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.
  • For vehicles equipped with seat side air bags, carry out the following:
    • Disconnect affected seat side air bag C314 (driver) or C316 (passenger).
    • Connect restraint system diagnostic tool 418-133 to affected seat side air bag C314 (driver) or C316 (passenger).
    • Disconnect the affected seat driver or passenger safety belt buckle pretensioner electrical connector at the pretensioner.
    • Connect restraint system diagnostic tool 418-F395 to the affected seat driver or passenger safety belt buckle pretensioner electrical connector.
  • WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
  • Connect the battery ground cable.
  • Remove the driver seat. Refer to Seat — Front in this section.
  • Is there any obstruction in the seat track?
 Yes
REMOVE the obstruction(s) and grease the track(s). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the driver or passenger seat safety belt buckle pretensioner electrical connector. CONNECT the driver or passenger seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C314 or passenger seat side air bag module C316. CONNECT driver seat side air bag module C314 or passenger seat side air bag module C316.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.

No
INSTALL a new seat track. REFER to Seat Track — Power in this section. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the driver or passenger seat safety belt buckle pretensioner electrical connector. CONNECT the driver or passenger seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C314 or passenger seat side air bag module C316. CONNECT driver seat side air bag module C314 or passenger seat side air bag module C316.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.

Pinpoint Test F: The Power Seat Does Not Move Horizontally — Driver Seat

Refer to Wiring Diagrams Cell 120, Power Seats for schematic and connector information.

Normal Operation

The seat control switch is powered by battery voltage to circuit 490 (RD) and is supplied ground on circuit 57 (BK). When either the FORWARD or REARWARD position is selected on the seat control switch, power and ground is applied to circuits 980 (YE/WH) and 981 (RD/WH) powering the horizontal motor to move the seat FORWARD or REARWARD. When the opposite switch position is selected, the seat control switch reverses the voltage polarity to the horizontal motor to move the seat in the opposite direction.

Possible Causes

An inoperative driver power seat can be caused by:

  • circuit 980 (YE/WH) open or short to ground.
  • circuit 981 (RD/WH) open or short to ground.
  • a faulty seat control switch.
  • a faulty seat track.

PINPOINT TEST F: THE POWER SEAT DOES NOT MOVE HORIZONTALLY — DRIVER SEAT

Test Step Result / Action to Take
F1 CHECK MOTOR SUPPLY CIRCUITS 980 (YE/WH) AND 981 (RD/WH) FOR A SHORT TO GROUND
    WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.
  • For vehicles equipped with seat side air bags, carry out the following:
    • Disconnect driver seat side air bag C314.
    • Connect restraint system diagnostic tool 418-133 to driver seat side air bag C314.
    • Disconnect the driver seat safety belt buckle pretensioner electrical connector at the pretensioner.
    • Connect restraint system diagnostic tool 418-F395 to the driver seat safety belt buckle pretensioner electrical connector.
  • WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
  • Connect the battery ground cable.
  • Disconnect: Seat Track Motor Assembly C357.
  • Measure the resistance between seat track motor assembly C357-1, circuit 981 (RD/WH), harness side and ground; and between seat track motor assembly C357-2, circuit 980 (YE/WH), harness side and ground.
    • Yes GO to F3 . No GO to F2 .
  • Are the resistances less than 5 ohms?
 Yes
GO to F3.

No
GO to F2.
F2 CHECK CIRCUITS 981 (RD/WH) AND 980 (YE/WH) FOR AN OPEN
  • Disconnect: Seat Control Switch C360.
  • Measure the resistance between seat track motor assembly C357-1, circuit 981 (RD/WH), harness side and seat control switch C360-5, circuit 981 (RD/WH), harness side; and between seat track motor assembly C357-2, circuit 980 (YE/WH), harness side and seat control switch C360-3, circuit 980 (YE/WH), harness side.
    • Yes INSTALL a new seat control switch. TEST the system for normal operation. DIS
  • Are the resistances less than 5 ohms?
 Yes
INSTALL a new seat control switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the driver seat safety belt buckle pretensioner electrical connector. CONNECT the driver seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C314. CONNECT driver seat side air bag module C314.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.

No
REPAIR the affected circuit(s). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the driver seat safety belt buckle pretensioner electrical connector. CONNECT the driver seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C314. CONNECT driver seat side air bag module C314.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.
F3 CHECK CIRCUIT 981 (RD/WH) FOR VOLTAGE TO THE SEAT TRACK MOTOR ASSEMBLY
  • Connect: Seat Control Switch C360.
  • Measure the voltage between seat track motor assembly C357-1, circuit 981 (RD/WH), harness side and ground while selecting the REARWARD position on the seat control switch.
    • Yes GO to F4 . No INSTALL a new seat control switch. TEST the system for normal
  • Is the voltage greater than 10 volts?
 Yes
GO to F4.

No
INSTALL a new seat control switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the driver seat safety belt buckle pretensioner electrical connector. CONNECT the driver seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C314. CONNECT driver seat side air bag module C314.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.
F4 CHECK CIRCUIT 980 (YE/WH) FOR VOLTAGE TO THE SEAT TRACK MOTOR ASSEMBLY
  • Measure the voltage between seat track motor assembly C357-2, circuit 980 (YE/WH), harness side and ground while selecting the FORWARD position on the seat control switch.
    • Yes INSTALL a new seat track. REFER to Seat Track — Power in this section. TEST
  • Is the voltage greater than 10 volts?
 Yes
INSTALL a new seat track. REFER to Seat Track — Power in this section. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the driver seat safety belt buckle pretensioner electrical connector. CONNECT the driver seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C314. CONNECT driver seat side air bag module C314.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.

No
INSTALL a new seat control switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the driver seat safety belt buckle pretensioner electrical connector. CONNECT the driver seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C314. CONNECT driver seat side air bag module C314.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.

Pinpoint Test G: The Power Seat Does Not Move Horizontally — Passenger Seat

Refer to Wiring Diagrams Cell 120, Power Seats for schematic and connector information.

Normal Operation

The seat control switch is powered by battery voltage to circuit 490 (RD) and is supplied ground on circuit 57 (BK). When either the FORWARD or REARWARD position is selected on the seat control switch, power and ground is applied to circuits 980 (YE/WH) and 981 (RD/WH) powering the horizontal motor to move the seat FORWARD or REARWARD. When the opposite switch position is selected, the seat control switch reverses the voltage polarity to the horizontal motor to move the seat in the opposite direction.

Possible Causes

An inoperative passenger power seat can be caused by:

  • circuit 980 (YE/WH) open or short to ground.
  • circuit 981 (RD/WH) open or short to ground.
  • a faulty seat control switch.
  • a faulty seat track.

PINPOINT TEST G: THE POWER SEAT DOES NOT MOVE HORIZONTALLY — PASSENGER SEAT

Test Step Result / Action to Take
G1 CHECK MOTOR SUPPLY CIRCUITS 980 (YE/WH) AND 981 (RD/WH) FOR A SHORT TO GROUND
    WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.
  • For vehicles equipped with seat side air bags, carry out the following:
    • Disconnect passenger seat side air bag C316.
    • Connect restraint system diagnostic tool 418-133 to passenger seat side air bag C316.
    • Disconnect the passenger seat safety belt buckle pretensioner electrical connector at the pretensioner.
    • Connect restraint system diagnostic tool 418-F395 to the passenger seat safety belt buckle pretensioner electrical connector.
  • WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
  • Connect the battery ground cable.
  • Disconnect: Seat Track Motor Assembly C332.
  • Measure the resistance between seat track motor assembly C332-2, circuit 981 (RD/WH) and ground; and between seat track motor assembly C332-1, circuit 980 (YE/WH) and ground.
    • Yes GO to G3 . No GO to G2 .
  • Are the resistances less than 5 ohms?
 Yes
GO to G3.

No
GO to G2.
G2 CHECK CIRCUITS 981 (RD/WH) AND 980 (YE/WH) FOR OPEN
  • Disconnect: Seat Control Switch C330.
  • Measure the resistance between seat track motor assembly C332-2, circuit 981 (RD/WH), harness side and seat control switch C330-5, circuit 981 (RD/WH), harness side; and between seat track motor assembly C332-1, circuit 980 (YE/WH), harness side and seat control switch C330-3, circuit 980 (YE/WH), harness side.
    • Yes INSTALL a new seat control switch. TEST the system for normal operation. DIS
  • Are the resistances less than 5 ohms?
 Yes
INSTALL a new seat control switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the passenger seat safety belt buckle pretensioner electrical connector. CONNECT the passenger seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.

No
REPAIR the affected circuit(s). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the passenger seat safety belt buckle pretensioner electrical connector. CONNECT the passenger seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.
G3 CHECK CIRCUIT 981 (RD/WH) FOR VOLTAGE TO THE SEAT TRACK MOTOR ASSEMBLY
  • Connect: Seat Control Switch C330.
  • Measure the voltage between seat track motor assembly C332-2, circuit 981 (RD/WH), harness side and ground while selecting the REARWARD position on the seat control switch.
    • Yes GO to G4 . No INSTALL a new seat control switch. TEST the system for normal
  • Is the voltage greater than 10 volts?
 Yes
GO to G4.

No
INSTALL a new seat control switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the passenger seat safety belt buckle pretensioner electrical connector. CONNECT the passenger seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.
G4 CHECK CIRCUIT 980 (YE/WH) FOR VOLTAGE TO THE SEAT TRACK MOTOR ASSEMBLY
  • Measure the voltage between seat track motor assembly C332-1, circuit 980 (YE/WH), harness side and ground while selecting the FORWARD position of the seat control switch.
    • Yes INSTALL a new seat track. REFER to Seat Track — Power in this section. TEST
  • Is the voltage greater than 10 volts?
 Yes
INSTALL a new seat track. REFER to Seat Track — Power in this section. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the passenger seat safety belt buckle pretensioner electrical connector. CONNECT the passenger seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.

No
INSTALL a new seat control switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the passenger seat safety belt buckle pretensioner electrical connector. CONNECT the passenger seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.

Pinpoint Test H: The Power Seat Does Not Move Vertically — Driver Seat, Front Height

Refer to Wiring Diagrams Cell 120, Power Seats for schematic and connector information.

Normal Operation

The seat control switch is powered by battery voltage to circuit 490 (RD) and is supplied ground on circuit 57 (BK). When either the FRONT UP or FRONT DOWN position is selected on the seat control switch, power and ground is applied to circuits 979 (RD/LB) and 990 (YE/LB) powering the front height motor to move the seat UP or DOWN. When the opposite switch position is selected, the seat control switch reverses the voltage polarity to the front height motor to move the seat in the opposite direction.

Possible Causes

A driver power seat front height motor that does not move the seat vertically can be caused by:

  • circuit 979 (RD/LB) open or short to ground.
  • circuit 990 (YE/LB) open or short to ground.
  • a faulty seat control switch.
  • a faulty seat track.

PINPOINT TEST H: THE POWER SEAT DOES NOT MOVE VERTICALLY — DRIVER SEAT, FRONT HEIGHT

Test Step Result / Action to Take
H1 CHECK MOTOR SUPPLY CIRCUITS 979 (RD/LB) AND 990 (YE/LB) FOR A SHORT TO GROUND
    WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.
  • For vehicles equipped with seat side air bags, carry out the following:
    • Disconnect driver seat side air bag C314.
    • Connect restraint system diagnostic tool 418-133 to driver seat side air bag C314.
    • Disconnect the driver seat safety belt buckle pretensioner electrical connector at the pretensioner.
    • Connect restraint system diagnostic tool 418-F395 to the driver seat safety belt buckle pretensioner electrical connector.
  • WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
  • Connect the battery ground cable.
  • Disconnect: Seat Track Motor Assembly C357.
  • Measure the resistance between seat track motor assembly C357-5, circuit 979 (RD/LB), harness side and ground; and between seat track motor assembly C357-3, circuit 990 (YE/LB), harness side and ground.
    • Yes GO to H3 . No GO to H2 .
  • Are the resistances less than 5 ohms?
 Yes
GO to H3.

No
GO to H2.
H2 CHECK CIRCUITS 979 (RD/LB) AND 990 (YE/LB) FOR OPEN
  • Disconnect: Seat Control Switch C360.
  • Measure the resistance between seat track motor assembly C357-5, circuit 979 (RD/LB), harness side and seat control switch C360-2, circuit 979 (RD/LB), harness side; and between seat track motor assembly C357-3, circuit 990 (YE/LB), harness side and seat control switch C360-8, circuit 990 (YE/LB).
    • Yes INSTALL a new seat control switch. TEST the system for normal operation. DIS
  • Are the resistances less than 5 ohms?
 Yes
INSTALL a new seat control switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the driver seat safety belt buckle pretensioner electrical connector. CONNECT the driver seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C314. CONNECT driver seat side air bag module C314.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.

No
REPAIR the affected circuit(s). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the driver seat safety belt buckle pretensioner electrical connector. CONNECT the driver seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C314. CONNECT driver seat side air bag module C314.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.
H3 CHECK CIRCUIT 979 (RD/LB) FOR VOLTAGE TO THE SEAT TRACK MOTOR ASSEMBLY
  • Connect: Seat Control Switch C360.
  • Measure the voltage between seat track motor assembly C357-5, circuit 979 (RD/LB), harness side and ground while selecting the REARWARD position on the seat control switch.
    • Yes GO to H4 . No INSTALL a new seat control switch. TEST the system for normal
  • Is the voltage greater than 10 volts?
 Yes
GO to H4.

No
INSTALL a new seat control switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the driver seat safety belt buckle pretensioner electrical connector. CONNECT the driver seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C314. CONNECT driver seat side air bag module C314.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.
H4 CHECK CIRCUIT 990 (YE/LB) FOR VOLTAGE TO THE SEAT TRACK MOTOR ASSEMBLY
  • Measure the voltage between seat track motor assembly C357-3, circuit 990 (YE/LB), harness side and ground, while selecting the FORWARD position on the seat control switch.
    • Yes INSTALL a new seat track. REFER to Seat Track — Power in this section. TEST
  • Is the voltage greater than 10 volts?
 Yes
INSTALL a new seat track. REFER to Seat Track — Power in this section. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the driver seat safety belt buckle pretensioner electrical connector. CONNECT the driver seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C314. CONNECT driver seat side air bag module C314.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.

No
INSTALL a new seat control switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the driver seat safety belt buckle pretensioner electrical connector. CONNECT the driver seat safety belt buckle pretensioner electrical connector. For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C314. CONNECT driver seat side air bag module C314.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.

Pinpoint Test I: The Power Seat Does Not Move Vertically — Passenger Seat, Front Height

Refer to Wiring Diagrams Cell 120, Power Seats for schematic and connector information.

Normal Operation

The seat control switch is powered by battery voltage to circuit 490 (RD) and is supplied ground on circuit 57 (BK). When either the FRONT UP or FRONT DOWN position is selected on the seat control switch, power and ground is applied to circuits 979 (RD/LB) and 990 (YE/LB) powering the front height motor to move the seat UP or DOWN. When the opposite switch position is selected, the seat control switch reverses the voltage polarity to the front height motor to move the seat in the opposite direction.

Possible Causes

A passenger power seat front height motor that does not move the seat vertically can be caused by:

  • circuit 979 (RD/LB) open or short to ground.
  • circuit 990 (YE/LB) open or short to ground.
  • a faulty seat control switch.
  • a faulty seat track.

PINPOINT TEST I: THE POWER SEAT DOES NOT MOVE VERTICALLY — PASSENGER SEAT, FRONT HEIGHT

Test Step Result / Action to Take
I1 CHECK MOTOR SUPPLY CIRCUITS 979 (RD/LB) AND 990 (YE/LB) FOR A SHORT TO GROUND
    WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.
  • For vehicles equipped with seat side air bags, carry out the following:
    • Disconnect passenger seat side air bag C316.
    • Connect restraint system diagnostic tool 418-133 to passenger seat side air bag C316.
    • Disconnect the passenger seat safety belt buckle pretensioner electrical connector at the pretensioner.
    • Connect restraint system diagnostic tool 418-F395 to the passenger seat safety belt buckle pretensioner electrical connector.
  • WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
  • Connect the battery ground cable.
  • Disconnect: Seat Track Motor Assembly C332.
  • Measure the resistance between seat track motor assembly C332-4, circuit 979 (RD/LB), harness side and ground; and between seat track motor assembly C332-6, circuit 990 (YE/LB), harness side and ground.
    • Yes GO to I3 . No GO to I2 .
  • Are the resistances less than 5 ohms?
 Yes
GO to I3.

No
GO to I2.
I2 CHECK CIRCUITS 979 (RD/LB) AND 990 (YE/LB) FOR AN OPEN
  • Disconnect: Seat Control Switch C330.
  • Measure the resistance between seat track motor assembly C332-4, circuit 979 (RD/LB), harness side and seat control switch C330-2, circuit 979 (RD/LB), harness side; and between seat track motor assembly C332-6, circuit 990 (YE/LB), harness side and seat control switch C330-8, circuit 990 (YE/LB), harness side.
    • Yes INSTALL a new seat control switch. TEST the system for normal operation. DIS
  • Are the resistances less than 5 ohms?
 Yes
INSTALL a new seat control switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the passenger seat safety belt buckle pretensioner electrical connector. CONNECT the passenger seat safety belt buckle pretensioner electrical connector. For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.

No
REPAIR the affected circuit(s). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the passenger seat safety belt buckle pretensioner electrical connector. CONNECT the passenger seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.
I3 CHECK CIRCUIT 979 (RD/LB) FOR VOLTAGE TO THE SEAT TRACK MOTOR ASSEMBLY
  • Connect: Seat Control Switch C330.
  • Measure the voltage between seat track motor assembly C332-4, circuit 979 (RD/LB), harness side and ground while selecting the REARWARD position on the seat control switch.
    • Yes GO to I4 . No INSTALL a new seat control switch. TEST the system for normal
  • Is the voltage greater than 10 volts?
 Yes
GO to I4.

No
INSTALL a new seat control switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the passenger seat safety belt buckle pretensioner electrical connector. CONNECT the passenger seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.
I4 CHECK CIRCUIT 990 (YE/LB) FOR VOLTAGE TO THE SEAT TRACK MOTOR ASSEMBLY
  • Measure the voltage between seat track motor assembly C332-6, circuit 990 (YE/LB), harness side and ground, while selecting the FORWARD position on the seat control switch.
    • Yes INSTALL a new seat track. REFER to Seat Track — Power in this section. TEST
  • Is the voltage greater than 10 volts?
 Yes
INSTALL a new seat track. REFER to Seat Track — Power in this section. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the passenger seat safety belt buckle pretensioner electrical connector. CONNECT the passenger seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.

No
INSTALL a new seat control switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the passenger seat safety belt buckle pretensioner electrical connector. CONNECT the passenger seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.

Pinpoint Test J: The Power Seat Does Not Move Vertically — Driver Seat, Rear Height

Refer to Wiring Diagrams Cell 120, Power Seats for schematic and connector information.

Normal Operation

The seat control switch is powered by battery voltage to circuit 490 (RD) and is supplied ground on circuit 57 (BK). When either the REAR UP or REAR DOWN position is selected on the seat control switch, power and ground is applied to circuits 982 (YE/LG) and 983 (RD/LG) powering the rear height motor to move the seat UP or DOWN. When the opposite switch position is selected, the seat control switch reverses the voltage polarity to the rear height motor to move the seat in the opposite direction.

Possible Causes

A driver power seat rear height motor that does not move the seat vertically can be caused by:

  • circuit 982 (YE/LG) open or short to ground.
  • circuit 983 (RD/LG) open or short to ground.
  • a faulty seat control switch.
  • a faulty seat track.

PINPOINT TEST J: THE POWER SEAT DOES NOT MOVE VERTICALLY — DRIVER SEAT, REAR HEIGHT

Test Step Result / Action to Take
J1 CHECK MOTOR SUPPLY CIRCUITS 982 (YE/LG) AND 983 (RD/LG) FOR A SHORT TO GROUND
    WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.
  • For vehicles equipped with seat side air bags, carry out the following:
    • Disconnect driver seat side air bag C314.
    • Connect restraint system diagnostic tool 418-133 to driver seat side air bag C314.
    • Disconnect the driver seat safety belt buckle pretensioner electrical connector at the pretensioner.
    • Connect restraint system diagnostic tool 418-F395 to the driver seat safety belt buckle pretensioner electrical connector.
  • WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
  • Connect the battery ground cable.
  • Disconnect: Seat Track Motor Assembly C357.
  • Measure the resistance between seat track motor assembly C357-4, circuit 983 (RD/LG), harness side and ground; and between seat track motor assembly C357-6, circuit 982 (YE/LG), harness side and ground.
    • Yes GO to J3 . No GO to J2 .
  • Are the resistances less than 5 ohms?
 Yes
GO to J3.

No
GO to J2.
J2 CHECK CIRCUITS 983 (RD/LG) AND 982 (YE/LG) FOR AN OPEN
  • Disconnect: Seat Control Switch C360.
  • Measure the resistance between seat track motor assembly C357-4, circuit 983 (RD/LG), harness side and seat control switch C360-6, circuit 983 (RD/LG), harness side; and between seat track motor assembly C357-6, circuit 982 (YE/LG), harness side and seat control switch C360-4, circuit 982 (YE/LG), harness side.
    • Yes INSTALL a new seat control switch. TEST the system for normal operation. DIS
  • Are the resistances less than 5 ohms?
 Yes
INSTALL a new seat control switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the driver seat safety belt buckle pretensioner electrical connector. CONNECT the driver seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C314. CONNECT driver seat side air bag module C314.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.

No
REPAIR the affected circuit(s). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the driver seat safety belt buckle pretensioner electrical connector. CONNECT the driver seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C314. CONNECT driver seat side air bag module C314.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.
J3 CHECK CIRCUIT 983 (RD/LG) FOR VOLTAGE TO THE SEAT TRACK MOTOR ASSEMBLY
  • Connect: Seat Control Switch C360.
  • Measure the voltage between seat track motor assembly C357-4, circuit 983 (RD/LG), harness side and ground, while selecting the REARWARD position on the seat control switch.
    • Yes GO to J4 . No INSTALL a new seat control switch. TEST the system for normal
  • Is the voltage greater than 10 volts?
 Yes
GO to J4.

No
INSTALL a new seat control switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the driver seat safety belt buckle pretensioner electrical connector. CONNECT the driver seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C314. CONNECT driver seat side air bag module C314.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.
J4 CHECK CIRCUIT 982 (YE/LG) FOR VOLTAGE TO THE SEAT TRACK MOTOR ASSEMBLY
  • Measure the voltage between seat track motor assembly C357-6, circuit 982 (YE/LG), harness side and ground, while selecting the FORWARD position on the seat control switch.
    • Yes INSTALL a new seat track. REFER to Seat Track — Power in this section. TEST
  • Is the voltage greater than 10 volts?
 Yes
INSTALL a new seat track. REFER to Seat Track — Power in this section. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the driver seat safety belt buckle pretensioner electrical connector. CONNECT the driver seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C314. CONNECT driver seat side air bag module C314.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.

No
INSTALL a new seat control switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the driver seat safety belt buckle pretensioner electrical connector. CONNECT the driver seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C314. CONNECT driver seat side air bag module C314.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.

Pinpoint Test K: The Power Seat Does Not Move Vertically — Passenger Seat, Rear Height

Refer to Wiring Diagrams Cell 120, Power Seats for schematic and connector information.

Normal Operation

The seat control switch is powered by battery voltage to circuit 490 (RD) and is supplied ground on circuit 57 (BK). When either the REAR UP or REAR DOWN position is selected on the seat control switch, power and ground is applied to circuits 982 (YE/LG) and 983 (RD/LG) powering the rear height motor assembly to move the seat UP or DOWN. When the opposite switch position is selected, the seat control switch reverses the voltage polarity to the rear height motor to move the seat in the opposite direction.

Possible Causes

A passenger power seat rear height motor that does not move the seat vertically can be caused by:

  • circuit 982 (YE/LG) open or short to ground.
  • circuit 983 (RD/LG) open or short to ground.
  • a faulty seat control switch.
  • a faulty seat track.

PINPOINT TEST K: THE POWER SEAT DOES NOT MOVE VERTICALLY — PASSENGER SEAT, REAR HEIGHT

Test Step Result / Action to Take
K1 CHECK MOTOR SUPPLY CIRCUITS 982 (YE/LG) AND 983 (RD/LG) FOR A SHORT TO GROUND
    WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.
  • For vehicles equipped with seat side air bags, carry out the following:
    • Disconnect passenger seat side air bag C316.
    • Connect restraint system diagnostic tool 418-133 to passenger seat side air bag C316.
    • Disconnect the passenger seat safety belt buckle pretensioner electrical connector at the pretensioner.
    • Connect restraint system diagnostic tool 418-F395 to the passenger seat safety belt buckle pretensioner electrical connector.
  • WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
  • Connect the battery ground cable.
  • Disconnect: Seat Track Motor Assembly C332.
  • Measure the resistance between seat track motor assembly C332-5, circuit 983 (RD/LG), harness side and ground; and between seat track motor assembly C332-3, circuit 982 (YE/LG), harness side and ground.
    • Yes GO to K3 . No GO to K2 .
  • Are the resistances less than 5 ohms?
 Yes
GO to K3.

No
GO to K2.
K2 CHECK CIRCUITS 982 (YE/LG) AND 983 (RD/LG) FOR AN OPEN
  • Disconnect: Seat Control Switch C330.
  • Measure the resistance between seat track motor assembly C332-5, circuit 983 (RD/LG), harness side and seat control switch C330-6, circuit 983 (RD/LG), harness side; and between seat track motor assembly C332-3, circuit 982 (YE/LG), harness side and seat control switch C330-4, circuit 982 (YE/LG), harness side.
    • Yes INSTALL a new seat control switch. TEST the system for normal operation. DIS
  • Are the resistances less than 5 ohms?
 Yes
INSTALL a new seat control switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the passenger seat safety belt buckle pretensioner electrical connector. CONNECT the passenger seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.

No
REPAIR the affected circuit(s). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the passenger seat safety belt buckle pretensioner electrical connector. CONNECT the passenger seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.
K3 CHECK CIRCUIT 983 (RD/LG) FOR VOLTAGE TO THE SEAT TRACK MOTOR ASSEMBLY
  • Connect: Seat Control Switch C330.
  • Measure the voltage between seat track motor assembly C332-5, circuit 983 (RD/LG), harness side and ground, while selecting the REARWARD position on the seat control switch.
    • Yes GO to K4 . No INSTALL a new seat control switch. TEST the system for normal
  • Is the voltage greater than 10 volts?
 Yes
GO to K4.

No
INSTALL a new seat control switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the passenger seat safety belt buckle pretensioner electrical connector. CONNECT the passenger seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.
K4 CHECK CIRCUIT 982 (YE/LG) FOR VOLTAGE TO THE SEAT TRACK MOTOR ASSEMBLY
  • Measure the voltage between seat track motor assembly C332-3, circuit 982 (YE/LG), harness side and ground, while selecting the FORWARD position on the seat control switch.
    • Yes INSTALL a new seat track. REFER to Seat Track — Power in this section. TEST
  • Is the voltage greater than 10 volts?
 Yes
INSTALL a new seat track. REFER to Seat Track — Power in this section. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the passenger seat safety belt buckle pretensioner electrical connector. CONNECT the passenger seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.

No
INSTALL a new seat control switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from the passenger seat safety belt buckle pretensioner electrical connector. CONNECT the passenger seat safety belt buckle pretensioner electrical connector.

For vehicles equipped with seat side air bags, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316.

For all vehicles, REPOWER the supplemental restraint system (SRS). REFER to Section 501-20B.

Parts & tools for this job For 2007 Ford Taurus

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