Pinpoint Test A: The Mirrors Are Inoperative

Rear View Mirrors - Exterior

Pinpoint Tests

Pinpoint Test A: The Mirrors are Inoperative

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 receives voltage from Central Junction Box (CJB) fuse 2 (7.5A) through circuit 1523 (DG) and ground through circuit 57 (BK). The exterior mirror control switch uses circuit 945 (YE/BK) as the common circuit for both exterior mirror motor up/down and right/left movement.

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

PINPOINT TEST A: THE MIRRORS ARE INOPERATIVE

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A1 CHECK THE VOLTAGE TO THE EXTERIOR MIRROR CONTROL SWITCH


- Ignition OFF.
- Disconnect: Exterior Mirror Control Switch C527.
- Measure the voltage between exterior mirror control switch C527-3, circuit 1523 (DG), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
GO to A2.

No
VERIFY the CJB fuse 2 (7.5A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. TEST the system for normal operation. Diagrams By Number

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A2 CHECK CIRCUIT 57 (BK) FOR AN OPEN


- Measure the resistance between exterior mirror control switch C527-1, circuit 57 (BK), harness side and ground.




- Is the resistance less than 5 ohms?

Yes
GO to A3.

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

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A3 CHECK CIRCUIT 945 (YE/BK) FOR A SHORT TO VOLTAGE


- Ignition ON.
- Measure the voltage between exterior mirror control switch C527-6, circuit 945 (YE/BK), harness side and ground.




- Is any voltage present?

Yes
REPAIR the circuit. TEST the system for normal operation.

No
GO to A4.

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A4 CHECK CIRCUIT 945 (YE/BK) FOR A SHORT TO GROUND


- Ignition OFF.
- Measure the resistance between exterior mirror control switch C527-6, circuit 945 (YE/BK), harness side and ground.




- Is the resistance greater than 10,000 ohms?

Yes
GO to A5.

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

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A5 CHECK CIRCUIT 945 (YE/BK) FOR AN OPEN


- Disconnect: LH Exterior Mirror C516.
- Measure the resistance between exterior mirror control switch C527-6, circuit 945 (YE/BK), harness side and LH exterior mirror C516-2, circuit 945 (YE/BK), 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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