Pinpoint Test C: A Single Mirror Does Not Function With Switch Logic

Rear View Mirrors - Exterior

Pinpoint Test C: A Single Mirror Does Not Function with Switch Logic

Refer to Wiring Diagram Set 124, Power Mirrors for schematic and connector information. Diagrams By Number

Normal Operation

Under normal operation, the exterior mirror control switch uses circuits 940 (DB/OG), 942 (RD/OG), 943 (VT/OG), 944 (DG/OG) and 945 (YE/BK) to control the exterior mirror motor movement. The exterior mirror switch controls the LH exterior mirror motor movement by switching voltage and ground to circuits 940 (DB/OG), 942 (RD/OG) and 945 (YE/BK). The exterior mirror switch controls the RH exterior mirror motor movement by switching voltage and ground to circuits 943 (VT/OG), 944 (DG/OG) and 945 (YE/BK).

Mirror Movement
- When the LH/RH exterior mirror motor receives ground through circuit 940 (DB/OG)/943 (VT/OG) and voltage through circuit 945 (YE/BK), the LH/RH exterior mirror motor will operate downward.
- When the LH/RH exterior mirror motor receives voltage through circuit 940 (DB/OG)/943 (VT/OG) and ground through circuit 945 (YE/BK), the LH/RH exterior mirror motor will operate upward.
- When the LH/RH exterior mirror motor receives ground through circuit 942 (RD/OG)/944 (DG/OG) and voltage through circuit 945 (YE/BK), the LH/RH exterior mirror motor will operate rightward.
- When the LH/RH exterior mirror motor receives voltage through circuit 942 (RD/OG/944 (DG/OG) and ground through circuit 945 (YE/BK), the LH/RH exterior mirror motor will operate leftward.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Exterior mirror control switch
- Exterior mirror motor
- Exterior mirror

PINPOINT TEST C: A SINGLE MIRROR DOES NOT FUNCTION WITH SWITCH LOGIC

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C1 CHECK THE MIRROR MOVEMENT (LEFT/RIGHT)

- Operate the RH and LH exterior mirrors in the right and left direction using the exterior mirror control switch.
- Do the exterior mirrors move left and right?

Yes
GO to C2.

No
GO to C3.

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C2 CHECK THE MIRROR MOVEMENT (UP/DOWN)

- Operate the LH and RH exterior mirrors in the up and down direction.
- Do the exterior mirrors move up and down?

Yes
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation.

No
GO to C4.

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C3 CHECK THE VOLTAGE TO THE INOPERATIVE MIRROR

- Ignition OFF.
- Disconnect: Inoperative Exterior Mirror C516 (LH) or C622 (RH).

- NOTE: Position the exterior mirror control switch to the LH or RH mirror position.

- While operating the exterior mirror control switch in the LEFT position, measure the voltage between ground and exterior mirror:
- LH: C516-3, circuit 942 (RD/OG), harness side.
- RH: C622-3, circuit 944 (DG/OG), harness side.

- Is the voltage greater than 10 volts?

Yes
CHECK the RH or LH exterior mirror jumper harness between the vehicle harness and the exterior mirror motor for open circuits and damaged or pushed-out pins. If the jumper harness is not OK, REPAIR the jumper harness. If the jumper harness cannot be repaired, INSTALL a new RH or LH exterior mirror. REFER to Exterior Mirror Exterior Mirror. If the jumper harness is OK, INSTALL a new RH or LH exterior mirror motor. REFER to Exterior Mirror Motor Service and Repair. TEST the system for normal operation.

No
GO to C5.

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C4 CHECK THE VOLTAGE TO THE INOPERATIVE MIRROR

- Ignition OFF.
- Disconnect: Inoperative Exterior Mirror C516 (LH) or C622 (RH).

- NOTE: Position the exterior mirror control switch to the LH or RH mirror position.

- While operating the exterior mirror control switch in the UP position, measure the voltage between ground and exterior mirror:
- LH: C516-1, circuit 940 (DB/OG), harness side.
- RH: C622-1, circuit 943 (VT/OG), harness side.

- Is the voltage greater than 10 volts?

Yes
CHECK the RH or LH exterior mirror jumper harness between the vehicle harness and the exterior mirror motor for open circuits and damaged or pushed-out pins. If the jumper harness is not OK, REPAIR the jumper harness. If the jumper harness cannot be repaired, INSTALL a new RH or LH exterior mirror. REFER to Exterior Mirror Exterior Mirror. If the jumper harness is OK, INSTALL a new RH or LH exterior mirror motor. REFER to Exterior Mirror Motor Service and Repair. TEST the system for normal operation.

No
GO to C6.

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C5 CHECK CIRCUIT 942 (RD/OG) OR CIRCUIT 944 (DG/OG) FOR AN OPEN

- Disconnect: Exterior Mirror Control Switch C527.
- Inoperative LH mirror: Measure the resistance between exterior mirror control switch C527-8, circuit 942 (RD/OG), harness side and LH exterior mirror C516-3, circuit 942 (RD/OG), harness side.
- Inoperative RH mirror: Measure the resistance between exterior mirror control switch C527-7, circuit 944 (DG/OG) harness side and RH exterior mirror C622-3, circuit 944 (DG/OG) harness side.

- Is the resistance less than 5 ohms?

Yes
INSTALL a new exterior mirror control switch. REFER to Exterior Mirror Control Switch Service and Repair. TEST the system for normal operation.

No
REPAIR the circuit. TEST the system for normal operation.

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C6 CHECK CIRCUIT 940 (DB/OG) OR CIRCUIT 943 (VT/OG) FOR AN OPEN

- Disconnect: Exterior Mirror Control Switch C527.
- Inoperative LH mirror: Measure the resistance between exterior mirror control switch C527-5, circuit 940 (DB/OG), harness side and LH exterior mirror C516-1, circuit 940 (DB/OG), harness side.
- Inoperative RH mirror: Measure the resistance between exterior mirror control switch C527-2, circuit 943 (VT/OG), harness side and RH exterior mirror C622-1, circuit 943 (VT/OG), harness side.