| Diagnosis and Testing Special Tool(s) | | 73III Automotive Meter 105-R0057 or equivalent | | | Diagnostic Tool, Restraint System (2 required) 418-133 | Principles of Operation Power Seat (Driver Only) The 6-way power seat feature moves the seat in 6 possible directions. The base of the seat can be moved forward or rearward and the front or back of the base cushion can be moved up or down independently. The power seat feature operates independent of the position of the key. The power seat motors are hard-wired to the seat control switch. The seat control switch circuits are normally closed. Each circuit is switched to voltage or ground (depending on which direction is commanded) when an adjustment position is selected. Heated Seats The driver and passenger heated seats share a common ignition feed via the heated seat relay. The heated seat relay is energized when the ignition is ON. A shared ground source supplies the heated seat control switches and the heated seat elements. The heated seat control switches are a latching-type switch; continuity through the switch will remain, regardless if voltage is supplied to the switch or not, until the switch is pressed to place it in the OFF setting. When the heated seat control switch is pressed with the ignition switch in RUN or START, voltage is supplied to the bi-metallic thermostat that is part of the seat cushion element. The seat cushion element and seat backrest element are wired in series and powered by the same output of the bi-metallic thermostat that is part of the seat cushion element. The cushion element and seat backrest element are wired in series and powered by the same output. The heated seat will remain on until the heated seat control switch is pressed and voltage is no longer supplied to the bi-metallic thermostat. If the ignition source is removed from the heated seat, the heated seat system will return to ON with the ignition switch in the RUN state until the switch is pressed. The heated seat system is designed to maintain the temperature by the opening (no voltage to the heated seat elements) and closing (voltage supplied to the heated seat elements) of the bi-metallic thermostat. Inspection and Verification - Verify the customer concern.
- Visually inspect for the following obvious signs of mechanical and electrical damage.
Visual Inspection Chart | Mechanical | Electrical | - Switch(es)
- Seat tracks obstructed or damaged
| - Battery junction box (BJB) fuse 10 (30A)
- Smart junction box (SJB) fuses:
- Circuitry
- Loose or corroded connections
- Seat control switch
- Power seat motor(s)
- Heated seat switch(es)
- Heated seat relay
- Heated seat element(s)
| - If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
- If the cause is not visually evident, verify that symptom and GO to Symptom Chart.
Symptom Chart Symptom Chart | Symptom | Possible Sources | Action | | The power seat is inoperative — seats without heat | * Smart junction box (SJB) fuse 9 (30A) * Circuitry * Seat control switch | * | | The power seat is inoperative — seats with heat | * Smart junction box (SJB) fuse 9 (30A) * Circuitry * Seat control switch | * | | The power seat moves but is noisy | * Obstruction or foreign material * Seat track | * | | The power seat moves but is loose | * Fastening hardware * Seat track | * | | The power seat does not make full travel | * Seat track obstructed * Seat track | * | | The power seat does not move horizontally/vertically — seats without heat | * Circuitry * Seat control switch * Seat track | * | | The power seat does not move horizontally/vertically — seats with heat | * Circuitry * Seat control switch * Seat track | * | | The heated seat is inoperative | * Fuse * Circuitry * Heated seat relay * Heated seat switch | * | | The heated seat does not operate correctly — seat does not heat but the heated seat indicator illuminates when pressed | * Circuitry * Heated seat switch * Cushion heated seat element and bi-metallic thermostat * Backrest heated seat element | * | | The heated seat does not operate correctly — seat does heat but the heated seat indicator does not illuminate when pressed | * Circuitry * Heated seat switch | * CHECK circuit 57 (BK) for an open. If no problem is found, INSTALL a new heated seat switch. | Pinpoint Tests Pinpoint Test A: The Power Seat Is Inoperative — Seats Without Heat Refer to Wiring Diagrams Cell 120, for schematic and connector information. Normal Operation The seat control switch is powered by battery voltage through circuit 171 (BK/WH) and is grounded by circuit 57 (BK). The seat control switch then routes power and ground to the appropriate circuits to operate the seat motors. Possible Causes - Fuse
- Circuit 171 (BK/WH) open
- Circuit 57 (BK) open
- Seat control switch
| PINPOINT TEST A : THE POWER SEAT IS INOPERATIVE — SEATS WITHOUT HEAT | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | A1: CHECK THE GROUND CIRCUIT FOR AN OPEN | WARNING:The restraint system diagnostic tool is for restraint system repair only. Remove from the vehicle prior to road use. Failure to remove could result in personal injury and possible violation of vehicle safety standards. Failure to follow these instructions may result in personal injury. | | | NOTE:The air bag warning lamp illuminates when the restraint control module (RCM) fuse is removed and the key is in the ON position. This is normal operation and does not indicate an SRS fault. | NOTE:The SRS must be fully operational and free of faults before releasing the vehicle to the customer. | | | 1 Ignition switch in position 0. | | | 2 | | | 3 For vehicles equipped with seat side air bags, carry out the following: - Disconnect driver seat side air bag C367. Connect restraint system diagnostic tool 418-133.
| | | 4 Disconnect the driver safety belt pretensioner electrical connector at the pretensioner. | | | 5 Disconnect Seat Control Switch C352. | | | WARNING:Make certain no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in personal injury. 6 | | | 7 Measure the resistance between seat control switch C352-2, circuit 57 (BK) harness side and ground. | | | Is the resistance less than 5 ohms? Yes No REPAIR the circuit. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. | | A2: CHECK THE VOLTAGE TO THE SEAT CONTROL SWITCH | | | 1 Measure the voltage between seat control switch C352-4, circuit 171 (BK/WH) harness side and ground. | | | Is the voltage greater than 10 volts? Yes INSTALL a new seat control switch. REFER to Seat Control Switch in this section. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. No VERIFY smart junction box (SJB) fuse 9 (30A) is OK. If OK, REPAIR the circuit. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. | Pinpoint Test B: The Power Seat Is Inoperative — Seats With Heat Refer to Wiring Diagrams Cell 120, for schematic and connector information. Normal Operation The seat control switch is powered by battery voltage through circuit 171 (BK/WH) and is grounded by circuit 57 (BK). The seat control switch then routes power and ground to the appropriate circuits to operate the seat motors. Possible Causes - Fuse
- Circuit 171 (BK/WH) open
- Circuit 57 (BK) open
- Seat control switch
| PINPOINT TEST B : THE POWER SEAT IS INOPERATIVE — SEATS WITH HEAT | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | B1: CHECK THE GROUND CIRCUIT FOR AN OPEN | WARNING:The restraint system diagnostic tool is for restraint system repair only. Remove from the vehicle prior to road use. Failure to remove could result in personal injury and possible violation of vehicle safety standards. Failure to follow these instructions may result in personal injury. | | | NOTE:The air bag warning lamp illuminates when the restraint control module (RCM) fuse is removed and the key is in the ON position. This is normal operation and does not indicate an SRS fault. | NOTE:The SRS must be fully operational and free of faults before releasing the vehicle to the customer. | | | 1 Ignition switch in position 0. | | | 2 | | | 3 For vehicles equipped with seat side air bags, carry out the following: - Disconnect driver seat side air bag C367. Connect the restraint system diagnostic tool 418-133.
| | | 4 Disconnect the driver safety belt pretensioner electrical connector at the pretensioner. | | | 5 Disconnect Seat Control Switch C352. | | | WARNING:Make certain no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in personal injury. 6 | | | 7 Measure the resistance between seat control switch C352-E, circuit 57 (BK) harness side and ground. | | | Is the resistance less than 5 ohms? Yes No REPAIR the circuit. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. | | B2: CHECK THE VOLTAGE TO THE SEAT CONTROL SWITCH | | | 1 Measure the voltage between seat control switch C352-H, circuit 171 (BK/WH) harness side and ground. | | | Is the voltage greater than 10 volts? Yes INSTALL a new seat control switch. REFER to Seat Control Switch in this section. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. No VERIFY smart junction box (SJB) fuse 9 (30A) is OK. If OK, REPAIR the circuit. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. | Pinpoint Test C: The Power Seat Moves But Is Noisy Normal Operation The power seat should move quietly in the forward, rearward, front up/down and rear up/down directions during operation. Some noise is acceptable. Compare the noise to a similar vehicle for reference. Possible Causes - Misaligned seat track
- Seat track component
- Object obstructing seat movement
- Seat track
| PINPOINT TEST C : THE POWER SEAT MOVES BUT IS NOISY | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | C1: CHECK THE TRACK ALIGNMENT | WARNING:The restraint system diagnostic tool is for restraint system repair only. Remove from the vehicle prior to road use. Failure to remove could result in personal injury and possible violation of vehicle safety standards. Failure to follow these instructions may result in personal injury. | | | NOTE:The air bag warning lamp illuminates when the restraint control module (RCM) fuse is removed and the key is in the ON position. This is normal operation and does not indicate an SRS fault. | NOTE:The SRS must be fully operational and free of faults before releasing the vehicle to the customer. | | | 1 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 to the floor. TEST the system for normal operation. No | | C2: CHECK THE SEAT TRACK INTEGRITY | | | 1 While operating the seat, inspect the seat track for binding and/or damage. | | | Does the seat track appear to be free from damage/binding? Yes No INSTALL a new front seat track. REFER to Seat Track in this section. TEST the system for normal operation. | | C3: CHECK THE SEAT MOTOR INTEGRITY | | | 1 While operating the seat, listen for excessive seat motor noise. Compare the noise to a similar vehicle for reference. | | | Is the seat motor noise excessive? Yes INSTALL a new front seat track. REFER to Seat Track in this section. TEST the system for normal operation. No Allow the customer to compare to a similar vehicle to determine the amount of motor noise is product characteristic. TEST the system for normal operation. | 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 - Loose fastening hardware
- Seat track component
| PINPOINT TEST D : THE POWER SEAT MOVES BUT IS LOOSE | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | D1: CHECK THE FASTENING HARDWARE | WARNING:The restraint system diagnostic tool is for restraint system repair only. Remove from the vehicle prior to road use. Failure to remove could result in personal injury and possible violation of vehicle safety standards. Failure to follow these instructions may result in personal injury. | | | NOTE:The air bag warning lamp illuminates when the restraint control module (RCM) fuse is removed and the key is in the ON position. This is normal operation and does not indicate an SRS fault. | NOTE:The SRS must be fully operational and free of faults before releasing the vehicle to the customer. | | | 1 Check the fastening hardware and the condition of the seat track. | | | Is the fastening hardware and/or seat track loose? Yes TIGHTEN all fastening hardware to specification. INSTALL new seat track components as necessary. TEST the system for normal operation. No COMPARE the movement to a similar vehicle for reference. TEST the system for normal operation. | Pinpoint Test E: The Power Seat Does Not Make Full Travel Normal Operation The power seat should travel fully horizontal (forward/rearward) and vertical (front up/down and rear up/down). Possible Causes - Obstructed seat track
- Seat track
| PINPOINT TEST E : THE POWER SEAT DOES NOT MAKE FULL TRAVEL | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | E1: CHECK FOR AN OBSTRUCTION IN THE SEAT TRACK | WARNING:The restraint system diagnostic tool is for restraint system repair only. Remove from the vehicle prior to road use. Failure to remove could result in personal injury and possible violation of vehicle safety standards. Failure to follow these instructions may result in personal injury. | | | NOTE:The air bag warning lamp illuminates when the restraint control module (RCM) fuse is removed and the key is in the ON position. This is normal operation and does not indicate an SRS fault. | NOTE:The SRS must be fully operational and free of faults before releasing the vehicle to the customer. | | | 1 | | | 2 | | | 3 Check the seat track for obstructions or damage/misalignment of the seat track. | | | Is the seat track free of obstructions and in good condition? Yes No | Pinpoint Test F: The Power Seat Does Not Move Horizontally/Vertically — Seats Without Heat Refer to Wiring Diagrams Cell 120, for schematic and connector information. Normal Operation The seat control switch is powered by battery voltage on circuit 171 (BK/WH) and is grounded by circuit 57 (BK). When pressed in one of the 6 available directions, the seat control switch supplies voltage to the desired seat motor on the desired direction circuit. The seat control switch is normally closed to ground on all 6 of the seat motor circuits, so if one circuit becomes closed to power, the circuit on the opposite side of the same motor is still closed to ground. The seat motor will then operate, moving the seat track in the desired direction. Moving the seat control switch in the opposite direction reverses polarity to the seat motor, which causes the seat motor to move the seat track in the opposite direction. There are 3 seat motors integrated to the seat track assembly: one to move the seat horizontally (forward/rearward), one for front vertical (up/down) operation and one for rear vertical (up/down) operation. Possible Causes - Circuit 1469 (RD/LB) open
- Circuit 1470 (YE/LB) open
- Circuit 1471 (RD/WH) open
- Circuit 1472 (YE/WH) open
- Circuit 1473 (YE/LG) open
- Circuit 1474 (RD/LG) open
- Seat control switch
- Seat track motor and transmission assembly
| PINPOINT TEST F : THE POWER SEAT DOES NOT MOVE HORIZONTALLY/VERTICALLY — SEATS WITHOUT HEAT | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | F1: CHECK THE SEAT OPERATION | WARNING:The restraint system diagnostic tool is for restraint system repair only. Remove from the vehicle prior to road use. Failure to remove could result in personal injury and possible violation of vehicle safety standards. Failure to follow these instructions may result in personal injury. | | | NOTE:The air bag warning lamp illuminates when the restraint control module (RCM) fuse is removed and the key is in the ON position. This is normal operation and does not indicate an SRS fault. | NOTE:The SRS must be fully operational and free of faults before releasing the vehicle to the customer. | | | 1 Operate the seat control switch in the forward and rearward (horizontal) directions. | | | Does the seat move forward and rearward? Yes No | | F2: CHECK THE VERTICAL OPERATION | | | 1 Operate the seat control switch in the front tilt and rear tilt (vertical) directions. | | | Does the seat operate in the front tilt (vertical) direction? Yes No | | F3: CHECK THE VOLTAGE TO CIRCUIT 1474 (RD/LG) | | | 1 | | | 2 For vehicles equipped with seat side air bags, carry out the following: - Disconnect driver seat side air bag C367. Connect restraint system diagnostic tool 418-133.
| | | 3 Disconnect the driver safety belt pretensioner electrical connector at the pretensioner. | | | 4 Ignition switch in position 0. | | | 5 Disconnect Seat Motor C353. | | | WARNING:Make certain no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in personal injury. 6 | | | 7 While operating the seat control switch to the rear up position, measure the voltage between seat motor C353-2 circuit 1474 (RD/LG), harness side and ground. | | | Is the voltage greater than 10 volts? Yes No | | F4: CHECK CIRCUIT 1474 (RD/LG) FOR AN OPEN | | | 1 Disconnect Seat Control Switch C352. | | | 2 Measure the resistance between seat control switch C352-5 circuit 1474 (RD/LG), harness side and seat motor C353-2 circuit 1474 (RD/LG), harness side. | | | Is the resistance less than 5 ohms? Yes INSTALL a new seat control switch. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. No REPAIR the circuit. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. | | F5: CHECK THE VOLTAGE TO CIRCUIT 1473 (YE/LG) | | | 1 While operating the seat to the rear down position, measure the voltage between seat motor C353-3 circuit 1473 (YE/LG), harness and ground. | | | Is the voltage greater than 10 volts? Yes INSTALL a new front seat track. REFER to Seat Track in this section. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. No | | F6: CHECK CIRCUIT 1473 (YE/LG) FOR AN OPEN | | | 1 Disconnect Seat Control Switch C352. | | | 2 Measure the resistance between seat control switch C352-7 circuit 1473 (YE/LG), harness side and seat motor C353-3 circuit 1473 (YE/LG), harness side. | | | Is the resistance less than 5 ohms? Yes INSTALL a new seat control switch. REFER to Seat Control Switch in this section. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. No REPAIR the circuit. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. | | F7: CHECK THE VOLTAGE TO CIRCUIT 1469 (RD/LB) | | | 1 | | | 2 For vehicles equipped with seat side air bags, carry out the following: - Disconnect driver seat side air bag C367. Connect restraint system diagnostic tool 418-133.
| | | 3 Disconnect the driver safety belt pretensioner electrical connector at the pretensioner. | | | 4 Ignition switch in position 0. | | | 5 Disconnect Seat Motor C353. | | | WARNING:Make certain no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in personal injury. 6 | | | 7 While operating the seat to the front up position, measure the voltage between seat motor C353-6 circuit 1469 (RD/LB), harness side and ground. | | | Is the voltage greater than 10 volts? Yes No | | F8: CHECK CIRCUIT 1469 (RD/LB) FOR AN OPEN | | | 1 Disconnect Seat Control Switch C352. | | | 2 Measure the resistance between seat control switch C352-1 circuit 1469 (RD/LB), harness side and seat motor C353-6 circuit 1469 (RD/LB), harness side. | | | Is the resistance less than 5 ohms? Yes No REPAIR the circuit. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. | | F9: CHECK THE VOLTAGE TO CIRCUIT 1470 (YE/LB) | | | 1 While operating the seat control switch to the front down position, measure the voltage between seat control switch C352-8 circuit 1470 (YE/LB), harness side and ground. | | | Is the voltage greater than 10 volts? Yes INSTALL a new front seat track. REFER to Seat Track in this section. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. No | | F10: CHECK CIRCUIT 1470 (YE/LB) FOR AN OPEN | | | 1 Disconnect Seat Control Switch C352. | | | 2 Measure the resistance between seat control switch C352-8 circuit 1470 (YE/LB), harness side and seat motor C353-5 circuit 1470 (YE/LB), harness side. | | | Is the resistance less than 5 ohms? Yes INSTALL a new seat control switch. REFER to Seat Control Switch in this section. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. No REPAIR the circuit. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. | | F11: CHECK THE VOLTAGE TO CIRCUIT 1471 (RD/WH) | | | 1 | | | 2 For vehicles equipped with seat side air bags, carry out the following: - Disconnect driver seat side air bag C367. Connect restraint system diagnostic tool 418-133.
| | | 3 Disconnect the driver safety belt pretensioner electrical connector at the pretensioner. | | | 4 Ignition switch in position 0. | | | 5 Disconnect Seat Motor C353. | | | WARNING:Make certain no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in personal injury. 6 | | | 7 While operating the seat control switch to the forward position, measure the voltage between seat motor C353-4 circuit 1471 (RD/WH), harness side and ground. | | | Is the voltage greater than 10 volts? Yes No | | F12: CHECK CIRCUIT 1471 (RD/WH) FOR AN OPEN | | | 1 Disconnect Seat Control Switch C352. | | | 2 Measure the resistance between seat control switch C352-3 circuit 1471 (RD/WH), harness side and seat motor C353-4 circuit 1471 (RD/WH), harness side. | | | Is the resistance less than 5 ohms? Yes INSTALL a new seat control switch. REFER to Seat Control Switch in this section. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. No REPAIR the circuit. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. | | F13: CHECK THE VOLTAGE TO CIRCUIT 1472 (YE/WH) | | | 1 While operating the seat to the rearward position, measure the voltage between seat motor C353-1 circuit 1472 (YE/WH), harness and ground. | | | Is the voltage greater than 10 volts? Yes INSTALL a new front seat track. REFER to Seat Track in this section. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. No | | F14: CHECK CIRCUIT 1472 (YE/WH) FOR AN OPEN | | | 1 Disconnect Seat Control Switch C352. | | | 2 Measure the resistance between seat control switch C352-6 circuit 1472 (YE/WH), harness side and seat motor C353-1 circuit 1472 (YE/WH), harness side. | | | Is the resistance less than 5 ohms? Yes INSTALL a new seat control switch. REFER to Seat Control Switch in this section. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. No REPAIR the circuit. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. | Pinpoint Test G: The Power Seat Does Not Move Horizontally/Vertically — Seats With Heat Refer to Wiring Diagrams Cell 120, for schematic and connector information. Normal Operation The seat control switch is powered by battery voltage on circuit 171 (BK/WH) and is grounded by circuit 57 (BK). When pressed in one of the 6 available directions, the seat control switch supplies voltage to the desired seat motor on the desired direction circuit. The seat control switch is normally closed to ground on all 6 of the seat motor circuits, so if one circuit becomes closed to power, the circuit on the opposite side of the same motor is still closed to ground. The seat motor will then operate, moving the seat track in the desired direction. Moving the seat control switch in the opposite direction reverses polarity to the seat motor, which causes the seat motor to move the seat track in the opposite direction. There are 3 seat motors integrated to the seat track assembly: one to move the seat horizontally (forward/rearward), one for front vertical (up/down) operation and one for rear vertical (up/down) operation. Possible Causes - Circuit 1469 (RD/LB) open
- Circuit 1470 (YE/LB) open
- Circuit 1471 (RD/WH) open
- Circuit 1472 (YE/WH) open
- Circuit 1473 (YE/LG) open
- Circuit 1474 (RD/LG) open
- Seat control switch
- Seat track motor and transmission assembly
| PINPOINT TEST G : THE POWER SEAT DOES NOT MOVE HORIZONTALLY/VERTICALLY — SEATS WITH HEAT | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | G1: CHECK THE SEAT OPERATION | WARNING:The restraint system diagnostic tool is for restraint system repair only. Remove from the vehicle prior to road use. Failure to remove could result in personal injury and possible violation of vehicle safety standards. Failure to follow these instructions may result in personal injury. | | | NOTE:The air bag warning lamp illuminates when the restraint control module (RCM) fuse is removed and the key is in the ON position. This is normal operation and does not indicate an SRS fault. | NOTE:The SRS must be fully operational and free of faults before releasing the vehicle to the customer. | | | 1 Operate the seat control switch in the forward and rearward (horizontal) directions. | | | Does the seat move forward and rearward? Yes No | | G2: CHECK THE VERTICAL OPERATION | | | 1 Operate the seat control switch in the front tilt and rear tilt (vertical) directions. | | | Does the seat operate in the front tilt (vertical) direction? Yes No | | G3: CHECK THE VOLTAGE TO CIRCUIT 1474 (RD/LG) | | | 1 | | | 2 For vehicles equipped with seat side air bags, carry out the following: - Disconnect driver seat side air bag C367. Connect restraint system diagnostic tool 418-133.
| | | 3 Disconnect the driver safety belt pretensioner electrical connector at the pretensioner. | | | 4 Ignition switch in position 0. | | | 5 Disconnect Seat Motor C353. | | | WARNING:Make certain no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in personal injury. 6 | | | 7 While operating the seat control switch to the rear up position, measure the voltage between seat motor C353-2 circuit 1474 (RD/LG), harness side and ground. | | | Is the voltage greater than 10 volts? Yes No | | G4: CHECK CIRCUIT 1474 (RD/LG) FOR AN OPEN | | | 1 Disconnect Seat Control Switch C352. | | | 2 Measure the resistance between seat control switch C352-C circuit 1474 (RD/LG), harness side and seat motor C353-2 circuit 1474 (RD/LG), harness side. | | | Is the resistance less than 5 ohms? Yes INSTALL a new seat control switch. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. No REPAIR the circuit. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. | | G5: CHECK THE VOLTAGE TO CIRCUIT 1473 (YE/LG) | | | 1 While operating the seat to the rear down position, measure the voltage between seat motor C353-3 circuit 1473 (YE/LG), harness and ground. | | | Is the voltage greater than 10 volts? Yes INSTALL a new front seat track. REFER to Seat Track in this section. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. No | | G6: CHECK CIRCUIT 1473 (YE/LG) FOR AN OPEN | | | 1 Disconnect Seat Control Switch C352. | | | 2 Measure the resistance between seat control switch C352-D circuit 1473 (YE/LG), harness side and seat motor C353-3 circuit 1473 (YE/LG), harness side. | | | Is the resistance less than 5 ohms? Yes INSTALL a new seat control switch. REFER to Seat Control Switch in this section. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. No REPAIR the circuit. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. | | G7: CHECK THE VOLTAGE TO CIRCUIT 1469 (RD/LB) | | | 1 | | | 2 For vehicles equipped with seat side air bags, carry out the following: - Disconnect driver seat side air bag C367. Connect restraint system diagnostic tool 418-133.
| | | 3 Disconnect the driver safety belt pretensioner electrical connector at the pretensioner. | | | 4 Ignition switch in position 0. | | | 5 Disconnect Seat Motor C353. | | | WARNING:Make certain no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in personal injury. 6 | | | 7 While operating the seat to the front up position, measure the voltage between seat motor C353-6 circuit 1469 (RD/LB), harness side and ground. | | | Is the voltage greater than 10 volts? Yes No | | G8: CHECK CIRCUIT 1469 (RD/LB) FOR AN OPEN | | | 1 Disconnect Seat Control Switch C352. | | | 2 Measure the resistance between seat control switch C352-A circuit 1469 (RD/LB), harness side and seat motor C353-6 circuit 1469 (RD/LB), harness side. | | | Is the resistance less than 5 ohms? Yes No REPAIR the circuit. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. | | G9: CHECK THE VOLTAGE TO CIRCUIT 1470 (YE/LB) | | | 1 While operating the seat control switch to the front down position, measure the voltage between seat control switch C352-B circuit 1470 (YE/LB), harness side and ground. | | | Is the voltage greater than 10 volts? Yes INSTALL a new front seat track. REFER to Seat Track in this section. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. No | | G10: CHECK CIRCUIT 1470 (YE/LB) FOR AN OPEN | | | 1 Disconnect Seat Control Switch C352. | | | 2 Measure the resistance between seat control switch C352-B circuit 1470 (YE/LB), harness side and seat motor C353-5 circuit 1470 (YE/LB), harness side. | | | Is the resistance less than 5 ohms? Yes INSTALL a new seat control switch. REFER to Seat Control Switch in this section. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. No REPAIR the circuit. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. | | G11: CHECK THE VOLTAGE TO CIRCUIT 1471 (RD/WH) | | | 1 | | | 2 For vehicles equipped with seat side air bags, carry out the following: - Disconnect driver seat side air bag C367. Connect restraint system diagnostic tool 418-133.
| | | 3 Disconnect the driver safety belt pretensioner electrical connector at the pretensioner. | | | 4 Ignition switch in position 0. | | | 5 Disconnect Seat Motor C353. | | | WARNING:Make certain no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in personal injury. 6 | | | 7 While operating the seat control switch to the forward position, measure the voltage between seat motor C353-4 circuit 1471 (RD/WH), harness side and ground. | | | Is the voltage greater than 10 volts? Yes No | | G12: CHECK CIRCUIT 1471 (RD/WH) FOR AN OPEN | | | 1 Disconnect Seat Control Switch C352. | | | 2 Measure the resistance between seat control switch C352-G circuit 1471 (RD/WH), harness side and seat motor C353-4 circuit 1471 (RD/WH), harness side. | | | Is the resistance less than 5 ohms? Yes INSTALL a new seat control switch. REFER to Seat Control Switch in this section. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. No REPAIR the circuit. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. | | G13: CHECK THE VOLTAGE TO CIRCUIT 1472 (YE/WH) | | | 1 While operating the seat to the rearward position, measure the voltage between seat motor C353-1 circuit 1472 (YE/WH), harness and ground. | | | Is the voltage greater than 10 volts? Yes INSTALL a new front seat track. REFER to Seat Track in this section. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. No | | G14: CHECK CIRCUIT 1472 (YE/WH) FOR AN OPEN | | | 1 Disconnect Seat Control Switch C352. | | | 2 Measure the resistance between seat control switch C352-F circuit 1472 (YE/WH), harness side and seat motor C353-1 circuit 1472 (YE/WH), harness side. | | | Is the resistance less than 5 ohms? Yes INSTALL a new seat control switch. REFER to Seat Control Switch in this section. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. No REPAIR the circuit. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the driver seat side air bag connector. CONNECT the driver safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. | Pinpoint Test H: The Heated Seat Is Inoperative Refer to Wiring Diagrams Cell 119, for schematic and connector information. Normal Operation The driver and passenger heated seats share a common ignition feed via the heated seat relay. The heated seat relay is energized when the ignition is ON. A shared ground source supplies the heated seat control switches and the heated seat elements. The heated seat control switches are a latching-type switch; continuity through the switch will remain, regardless if voltage is supplied to the switch or not, until the switch is pressed to place it in the OFF setting. When the heated seat control switch is pressed with the ignition switch in RUN or START, voltage is supplied to the bi-metallic thermostat that is part of the seat cushion element. The seat cushion element and seat backrest element are wired in series and powered by the same output of the bi-metallic thermostat that is part of the seat cushion element. The cushion element and seat backrest element are wired in series and powered by the same output. The heated seat will remain on until the heated seat control switch is pressed and voltage is no longer supplied to the bi-metallic thermostat. If the ignition source is removed from the heated seat, the heated seat system will return to ON with the ignition switch in the RUN state until the switch is pressed. The heated seat system is designed to maintain the temperature by the opening (no voltage to the heated seat elements) and closing (voltage supplied to the heated seat elements) of the bi-metallic thermostat. Possible Causes An inoperative heated seat can be caused by: - fuse(s).
- circuit 1003 (GY/YE) open or short to ground.
- circuit 1153 (RD/BK) open or short to ground.
- circuit 581 (RD) open or short to ground.
- circuit 57 (BK) open.
- heated seat relay.
- heated seat switch.
| PINPOINT TEST H : THE HEATED SEAT IS INOPERATIVE | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | H1: CHECK HEATED SEAT SWITCH OPERATION | WARNING:The restraint system diagnostic tool is for restraint system repair only. Remove from the vehicle prior to road use. Failure to remove could result in personal injury and possible violation of vehicle safety standards. Failure to follow these instructions may result in personal injury. | | | NOTE:The air bag warning lamp illuminates when the restraint control module (RCM) fuse is removed and the key is in the ON position. This is normal operation and does not indicate an SRS fault. | NOTE:The SRS must be fully operational and free of faults before releasing the vehicle to the customer. | | | 1 Ignition switch in position II. | | | 2 Press the heated seat switch on the driver and passenger seats. | | | Do both heated switch indicators illuminate? Yes No | | H2: CHECK THE HEATED SEAT RELAY CIRCUITS | | | 1 | | | 2 For vehicles equipped with seat side air bags, carry out the following: - Disconnect driver seat side air bag C367 or passenger seat side air bag C337. Connect restraint system diagnostic tool 418-133.
| | | 3 Disconnect the driver or passenger safety belt pretensioner electrical connector at the pretensioner. | | | 4 Disconnect Heated Seat Relay C3250. | | | WARNING:Make certain that no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in personal injury. 5 | | | 6 Ignition switch in position II. | | | 7 Measure the voltage at heated seat relay C3250-86, circuit 1003 (GY/YE), harness side and ground; and between C3250-30, circuit 1153 (RD/BK), harness side and ground. | | | Are the voltages greater than 10 volts? Yes No VERIFY smart junction box (SJB) fuse 35 (5A) and battery junction box (BJB) fuse 10 (30A) are OK. If OK, REPAIR circuit 1003 (GY/YE) or circuit 1153 (RD/BK). DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the seat side air bag electrical connector. CONNECT the safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. | | H3: CHECK HEATED SEAT RELAY GROUND CIRCUIT | | | 1 Ignition switch in position 0. | | | 2 Measure the resistance between heated seat relay C3250-85, circuit 57 (BK), harness side and ground. | | | Is the resistance less than 5 ohms? Yes No REPAIR circuit 57 (BK). DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the seat side air bag electrical connector. CONNECT the safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. | | H4: CHECK THE HEATED SEAT RELAY | | | 1 Install a fused jumper lead between heat seat relay C3250-30, circuit 1153 (RD/BK), harness side and C3250-87, circuit 581 (RD) harness side. | | | Do both heated seat indicators illuminate when pressed? Yes INSTALL a new heated seat relay. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the seat side air bag electrical connector. CONNECT the safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. No REPAIR circuit 581 (RD). DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the seat side air bag electrical connector. CONNECT the safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. | | H5: CHECK INOPERATIVE HEATED SEAT SWITCH INPUT | | | 1 | | | 2 For vehicles equipped with seat side air bags, carry out the following: - Disconnect driver seat side air bag C367 or passenger seat side air bag C337. Connect restraint system diagnostic tool 418-133.
| | | 3 Disconnect the driver or passenger safety belt pretensioner electrical connector at the pretensioner. | | | 4 Disconnect Heated Seat Switch C320 (Driver) or C321 (Passenger). | | | WARNING:Make certain that no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in personal injury. 5 | | | 6 Ignition switch in position II. | | | 7 Measure the voltage between driver heated seat switch C320-2 (passenger C321), circuit 581 (RD), harness side and ground. | | | Is the voltage greater than 10 volts? Yes No REPAIR circuit 581 (RD). DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the seat side air bag electrical connector. CONNECT the safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. | | H6: CHECK CIRCUIT 57 (BK) FOR AN OPEN | | | 1 Measure the resistance between heated seat switch C320-4 (passenger C321), circuit 57 (BK), harness side and ground. | | | Is the resistance less than 5 ohms? Yes INSTALL a new heated seat switch. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the seat side air bag electrical connector. CONNECT the safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. No REPAIR circuit 57 (BK). DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the seat side air bag electrical connector. CONNECT the safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. | Pinpoint Test I: The Heated Seat Does Not Operate Correctly — Seat Does Not Heat But The Heated Seat Indicator Illuminates When Pressed Refer to Wiring Diagrams Cell 119, for schematic and connector information. Normal Operation The driver and passenger heated seats share a common ignition feed via the heated seat relay. The heated seat relay is energized when the ignition is ON. A shared ground source supplies the heated seat control switches and the heated seat elements. The heated seat control switches are a latching-type switch; continuity through the switch will remain, regardless if voltage is supplied to the switch or not, until the switch is pressed to place it in the OFF setting. When the heated seat control switch is pressed with the ignition switch in RUN or START, voltage is supplied to the bi-metallic thermostat that is part of the seat cushion element. The seat cushion element and seat backrest element are wired in series and powered by the same output of the bi-metallic thermostat that is part of the seat cushion element. The cushion element and seat backrest element are wired in series and powered by the same output. The heated seat will remain on until the heated seat control switch is pressed and voltage is no longer supplied to the bi-metallic thermostat. If the ignition source is removed from the heated seat, the heated seat system will return to ON with the ignition switch in the RUN state until the switch is pressed. The heated seat system is designed to maintain the temperature by the opening (no voltage to the heated seat elements) and closing (voltage supplied to the heated seat elements) of the bi-metallic thermostat. Possible Causes An inoperative heated seat can be caused by: - circuit 1067 (VT/LB) open or short to ground.
- circuit 57 (BK) open.
- backrest heated seat element.
- cushion heated seat element.
| PINPOINT TEST I : THE HEATED SEAT DOES NOT OPERATE CORRECTLY — SEAT DOES NOT HEAT BUT THE HEATED SEAT INDICATOR ILLUMINATES WHEN PRESSED | | TEST CONDITIONS | DETAILS/RESULTS/ACTIONS | | I1: CHECK CIRCUIT 1067 (VT/LB) FOR AN OPEN | WARNING:The restraint system diagnostic tool is for restraint system repair only. Remove from the vehicle prior to road use. Failure to remove could result in personal injury and possible violation of vehicle safety standards. Failure to follow these instructions may result in personal injury. | | | NOTE:The air bag warning lamp illuminates when the restraint control module (RCM) fuse is removed and the key is in the ON position. This is normal operation and does not indicate an SRS fault. | NOTE:The SRS must be fully operational and free of faults before releasing the vehicle to the customer. | | | 1 | | | 2 For vehicles equipped with seat side air bags, carry out the following: - Disconnect driver seat side air bag C367 or passenger seat side air bag C337. Connect restraint system diagnostic tool 418-133.
| | | 3 Disconnect the driver or passenger safety belt pretensioner electrical connector at the pretensioner. | | | 4 Disconnect Heated Seat Switch C320 (Driver) or C321 (Passenger). | | | 5 Disconnect Heated Seat Cushion Element C3283 (Driver) or C3284 (Passenger). | | | WARNING:Make certain that no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in personal injury. 6 | | | 7 Ignition switch in position 0. | | | 8 Measure the resistance between driver heated seat switch C320-1 (passenger C321-), circuit 1067 (VT/LB), harness side and driver cushion heated seat element C3283-2 (passenger C3284-), circuit 1067 (VT/LB) harness side. | | | Is the resistance less than 5 ohms? Yes No REPAIR circuit 1067 (VT/LB). DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the seat side air bag electrical connector. CONNECT the safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. | | I2: CHECK CUSHION AND BACKREST HEATED SEAT ELEMENTS FOR AN OPEN | | | 1 Measure the resistance between driver cushion heated seat element C3283 (passenger C3284) pin 1 (BK), and pin 2 (RD), component side. | | | Is the resistance less than 10 ohms? Yes No | | I3: CHECK BACKREST HEATED SEAT ELEMENT FOR AN OPEN | | | 1 Disconnect Backrest Heated Seat Element Connector. | | | 2 Measure the resistance between driver (or passenger) backrest heated seat element connector pin 1 (BK) and pin 2 (BK), component side. | | | Is the resistance less than 5 ohms? Yes INSTALL a new cushion heated seat element. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the seat side air bag electrical connector. CONNECT the safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. No INSTALL a new backrest heated seat element. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the seat side air bag electrical connector. CONNECT the safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. | | I4: CHECK CIRCUIT 1067 (VT/LB) FOR A SHORT TO GROUND | | | 1 Measure the resistance between driver cushion heated seat element C3283-2 (passenger C3284-), circuit 1067 (VT/LB), harness side and ground. | | | Is the resistance greater than 10,000 ohms? Yes No REPAIR circuit 1067 (VT/LB). DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the seat side air bag electrical connector. CONNECT the safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. | | I5: CHECK CIRCUIT 57 (BK) FOR AN OPEN | | | 1 Measure the resistance between driver cushion heated seat element C3283-1 (passenger C3284-), circuit 57 (BK) harness side and ground. | | | Is the resistance less than 5 ohms? Yes INSTALL a new heated seat switch. DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the seat side air bag electrical connector. CONNECT the safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. No REPAIR circuit 57 (BK). DISCONNECT the battery. If equipped, REMOVE the restraint system diagnostic tool and CONNECT the seat side air bag electrical connector. CONNECT the safety belt pretensioner electrical connector. REPOWER the supplemental restraint system (SRS). REFER to Section 501-20A Safety Belt SystemSection 501-20B Supplemental Restraint System. TEST the system for normal operation. | |
