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Diagnosis and Testing|Removal and Installation > < Rear View Mirrors - Vehicles Built Up To: 05-1999

Cougar 1999 (08.1998-01.2001)

Rear View Mirrors - Rear View Mirrors—Vehicles Built From: 05/1999 Cougar 1999 (08/1998-01/2001)
Diagnosis and Testing

Inspection and Verification

  1. Verify the customer concern by operating the exterior mirrors.
  1. Visually inspect for obvious signs of mechanical or electrical damage.
  1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

Visual Inspection Chart

Mechanical Electrical
  • Damaged mirror(s)
  • Damaged switch
  • Fuse(s)
  • Relay
  • Damaged wiring harness
  • Loose or corroded connector(s)
  • Exterior mirror motor
  • Switch
  1. NOTE:
    NOTE:Make sure all electrical diagnoses in the pinpoint tests are carried out using a digital multimeter.
    If the concern is not visually evident, determine the symptom and proceed to the following Symptom Chart.

Symptom Chart

Symptom Chart

Symptom Possible Sources Action
The mirrors are inoperative
*
Fuse.
*
Circuit.
*
Exterior mirror control switch.
*
GO to Pinpoint Test A.
A single mirror is inoperative
*
Circuit.
*
Exterior mirror control switch.
*
Exterior mirror motor.
*
Exterior mirror.
*
GO to Pinpoint Test B.
A single mirror does not function with switch logic
*
Exterior mirror control switch.
*
Exterior mirror.
*
Circuit.
*
GO to Pinpoint Test C.
The heated exterior mirror does not defrost
*
Fuse.
*
Relay.
*
Heated rear window switch.
*
Circuit.
*
Heated mirror element(s).
*
CHECK the rear window defrosts. REFER to Section  501-11 Glass, Frames and Mechanisms.

Pinpoint Tests

PINPOINT TEST A : THE MIRRORS ARE INOPERATIVE
TEST CONDITIONS DETAILS/RESULTS/ACTIONS
A1: CHECK FUSE 34 (7.5A)
1
CHECK Fuse 34 (7.5A).
2
Check fuse 34 (7.5A).

Is the fuse OK?
Yes
GO to A2.
No
INSTALL a new fuse. If the fuse fails, CHECK all consumers supplied from fuse 34. CHECK for a short to ground, REPAIR as necessary.
A2: CHECK THE INTERIOR LIGHT DELAY FUNCTION
1
CHECK the interior light delay function.

Does the interior light delay function operate correctly?
Yes
GO to A3.
No
CHECK the central timer operation. CHECK relay R24. For additional information, refer to the Wiring Diagrams.
A3: CHECK THE VOLTAGE TO THE EXTERIOR MIRROR CONTROL SWITCH CIRCUIT 29-AD12 (OG/YE)
1
Disconnect Exterior Mirror Control Switch C740.

2
Measure the voltage between the exterior mirror control switch C740 pin 4, circuit 29-AD12 (OG/YE), harness side and ground.

Is the voltage greater than 10 volts?
Yes
GO to A4.
No
REPAIR circuit 29-AD12 (OG/YE). TEST the system for normal operation.
A4: CHECK CIRCUIT 31-AD12 (BK) FOR CONTINUITY

1
Measure the resistance between the exterior mirror control switch C740 pin 6, circuit 31-AD12 (BK), harness side and ground.

Is the resistance less than 5 ohms?
Yes
GO to A5.
No
REPAIR circuit 31-AD12 (BK). TEST the system for normal operation.
A5: CHECK CIRCUIT 33-AD1 (YE/RD) FOR CONTINUITY
NOTE:
NOTE:The circuit number and wiring colors change at soldered joint S3
1
Disconnect Driver Exterior Mirror C807.

2
Measure the resistance between the exterior mirror control switch C740 pin 3, circuit 33-AD1 (YE/RD), harness side, and the driver exterior mirror C807 pin 2, circuit 33-AD6 (YE), harness side.

Is the resistance less than 5 ohms?
Yes
INSTALL a new exterior mirror control switch. TEST the system for normal operation.
No
REPAIR circuit 33-AD1 (YE/RD). TEST the system for normal operation.

PINPOINT TEST B : A SINGLE MIRROR IS INOPERATIVE
TEST CONDITIONS DETAILS/RESULTS/ACTIONS
B1: CHECK CIRCUIT 33-AD6 (YE) AND 33-AD20 (YE) FOR CONTINUITY
NOTE:
NOTE:The circuit numbers and wiring colors change at soldered joint S3.
1
Disconnect Inoperative Exterior Mirror.
2
Disconnect Exterior Mirror Control Switch C740.

3
Measure the resistance between the exterior mirror control switch C740 pin 3, circuit 33-AD1 (YE/RD), and the inoperative exterior mirror:
  • Driver exterior mirror, C807 pin 2, circuit 33-AD6 (YE), harness side.
  • Passenger exterior mirror, C71 pin 2, circuit 33-AD20 (YE), harness side.

Is the resistance less than 5 ohms?
Yes
GO to B2.
No
REPAIR circuit 33-AD6 (YE) and circuit 33-AD20 (YE). TEST the system for normal operation.
B2: CHECK THE EXTERIOR MIRROR CONTROL SWITCH
1
Carry out a component test of the exterior mirror control switch. For additional information, refer to the Wiring Diagram.

Is the switch OK?
Yes
INSTALL a new exterior mirror. TEST the system for normal operation.
No
INSTALL a new exterior mirror control switch. TEST the system for normal operation.

PINPOINT TEST C : A SINGLE MIRROR DOES NOT FUNCTION WITH SWITCH LOGIC
TEST CONDITIONS DETAILS/RESULTS/ACTIONS
C1: CHECK THE EXTERIOR MIRROR CONTROL SWITCH
1
Disconnect Exterior Mirror Control Switch C740.
2
Carry out a component test of the exterior mirror control switch. For additional information, refer to the Wiring Diagrams.

Is the switch OK?
Yes
Driver exterior mirror up/down. GO to C2. Driver exterior mirror left/right. GO to C5. Passenger exterior mirror up/down. GO to C8. Passenger exterior mirror left/right. GO to C11.
No
INSTALL a new exterior mirror. TEST the system for normal operation.
C2: CHECK THE DRIVER EXTERIOR MIRROR UP/DOWN CIRCUIT
1
Connect Exterior Mirror Control Switch C740.
2
Disconnect Driver Exterior Mirror C807.

3
Measure the voltage between the exterior mirror C807 pin 2, circuit 33-AD6 (YE), and pin 4, circuit 32-AD7 (WH/RD), harness side.
  • Operate the exterior mirror control switch UP and DOWN.

Is the voltage greater than 10 volts when the exterior mirror control switch is moved to the UP position and is the polarity reversed when moved to the DOWN position?
Yes
INSTALL a new exterior mirror. TEST the system for normal operation.
No
GO to C3.
C3: CHECK CIRCUIT 32-AD7 (WH/RD) FOR CONTINUITY
1
Disconnect Exterior Mirror Control Switch C740.

2
Measure the resistance between the exterior mirror control switch C740 pin 2, circuit 32-AD7 (WH/RD), harness side, and the exterior mirror C807 pin 4, circuit 32-AD7 (WH/RD), harness side.

Is the resistance less than 5 ohms?
Yes
GO to C4.
No
REPAIR circuit 32-AD7 (WH/RD). TEST the system for normal operation.
C4: CHECK CIRCUIT 33-AD6 (YE) FOR CONTINUITY

1
Measure the resistance between the exterior mirror control switch C740 pin 3, circuit 33-AD1 (YE/RD), harness side, and the exterior mirror C807 pin 2, circuit 33-AD6 (YE), harness side.

Is the resistance less than 5 ohms?
Yes
INSTALL a new exterior mirror. TEST the system for normal operation.
No
REPAIR circuit 33-AD6 (YE). TEST the system for normal operation.
C5: CHECK THE DRIVER EXTERIOR MIRROR LEFT/RIGHT CIRCUIT
1
Disconnect Driver Exterior Mirror C807.

2
Measure the voltage between the exterior mirror C807 pin 2, circuit 33-AD6 (YE), and pin 5, circuit 32-AD8 (WH/BU), harness side.
  • Operate the exterior mirror control switch LEFT and RIGHT.

Is the voltage greater than 10 volts when the exterior mirror control switch is moved to the LEFT position and is the polarity reversed when moved to the RIGHT position?
Yes
INSTALL a new exterior mirror. TEST the system for normal operation.
No
GO to C6.
C6: CHECK CIRCUIT 32-AD8 (WH/BU) FOR CONTINUITY
1
Disconnect Exterior Mirror Control Switch C740.

2
Measure the resistance between the exterior mirror control switch C740 pin 5, circuit 32-AD8 (WH/BU), harness side, and the exterior mirror C807 pin 5, circuit 32-AD8 (WH/BU), harness side.

Is the resistance less than 5 ohms?
Yes
GO to C7.
No
REPAIR circuit 32-AD8 (WH/BU). TEST the system for normal operation.
C7: CHECK CIRCUIT 33-AD6 (YE) FOR CONTINUITY

1
Measure the resistance between the exterior mirror control switch C740 pin 3, circuit 33-AD1 (YE/RD), harness side, and the exterior mirror C807 pin 2, circuit 33-AD6 (YE), harness side.

Is the resistance less than 5 ohms?
Yes
INSTALL a new exterior mirror. TEST the system for normal operation.
No
REPAIR circuit 33-AD6 (YE). TEST the system for normal operation.
C8: CHECK THE PASSENGER EXTERIOR MIRROR UP/DOWN CIRCUIT
1
Connect Exterior Mirror Control Switch C740.
2
Disconnect Passenger Exterior Mirror C71.

3
Measure the voltage between the exterior mirror C71 pin 2, circuit 33-AD20 (YE) and pin 4, circuit 32-AD22 (WH), harness side.
  • Operate the exterior mirror control switch UP and DOWN.

Is the voltage greater than 10 volts when the exterior mirror control switch is moved to the UP position and is the polarity reversed when moved to the DOWN position?
Yes
INSTALL a new exterior mirror. TEST the system for normal operation.
No
GO to C9.
C9: CHECK CIRCUIT 32-AD10 (WH/BK) OR 32-AD22 (WH) FOR CONTINUITY
1
Disconnect Exterior Mirror Control Switch C740.

2
Measure the resistance between the exterior mirror control switch C740 pin 1, circuit 32-AD10 (WH/BK), harness side, and C71 pin 4, circuit 32-AD22 (WH), harness side.

Is the resistance less than 5 ohms?
Yes
GO to C10.
No
REPAIR circuit 32-AD10 (WH/BK) or 32-AD22 (WH). TEST the system for normal operation.
C10: CHECK CIRCUIT 33-AD20 (YE) FOR CONTINUITY

1
Measure the resistance between the exterior mirror control switch C740 pin 3, circuit 33-AD1 (YE/RD), harness side, and the exterior mirror C71 pin 2, circuit 33-AD20 (YE), harness side.

Is the resistance less than 5 ohms?
Yes
INSTALL a new exterior mirror. TEST the system for normal operation.
No
REPAIR circuit 33-AD20 (YE). TEST the system for normal operation.
C11: CHECK THE PASSENGER EXTERIOR MIRROR LEFT/RIGHT CIRCUIT
1
Disconnect Passenger Exterior Mirror C71.

2
Measure the voltage between the exterior mirror C71 pin 2, circuit 33-AD20 (YE), harness side, and C71 pin 5, circuit 32-AD23 (WH/RD) harness side.
  • Operate the exterior mirror control switch LEFT and RIGHT.

Is the voltage greater than 10 volts when the exterior mirror control switch is moved to the LEFT position and is the polarity reversed when moved to the RIGHT position?
Yes
INSTALL a new exterior mirror. TEST the system for normal operation.
No
GO to C12.
C12: CHECK CIRCUIT 32-AD11 (WH/VT) FOR CONTINUITY
1
Disconnect Exterior Mirror Control Switch C740.

2
Measure the resistance between the exterior mirror control switch C740 pin 5, circuit 32-AD11 (WH/VT), harness side, and the exterior mirror C71 pin 5, circuit 32-AD23 (WH/RD), harness side.

Is the resistance less than 5 ohms?
Yes
GO to C13.
No
REPAIR circuit 32-AD11 (WH/VT) or 32-AD23 (WH/RD). TEST the system for normal operation.
C13: CHECK CIRCUIT 33-AD20 (YE) FOR CONTINUITY

1
Measure the resistance between the exterior mirror control switch C740 pin 3, circuit 33-AD1 (YE/RD) harness side, and the exterior mirror C71 pin 2, circuit 33-AD20 (YE), harness side.

Is the resistance less than 5 ohms?
Yes
INSTALL a new exterior mirror. TEST the system for normal operation.
No
REPAIR circuit 33-AD20 (YE). TEST the system for normal operation.

Diagnosis and Testing|Removal and Installation > < Rear View Mirrors - Vehicles Built Up To: 05-1999