Pinpoint Test A: The Exterior Rear View Mirrors Are Inoperative

Rear View Mirrors - Exterior

Pinpoint Test A: The Exterior Rear View Mirrors are Inoperative

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

Normal Operation

The exterior rear view mirror switch receives voltage at all times from the Central Junction Box (CJB). The exterior rear view mirror switch has only one ground circuit. The exterior rear view mirrors share a common circuit for both up/down and right/left movements.

This pinpoint test is intended to diagnose the following:

- Fuse

- Wiring, terminals or connectors

- Exterior rear view mirror switch

PINPOINT TEST A : THE EXTERIOR REAR VIEW MIRRORS ARE INOPERATIVE

A1 CHECK FOR VOLTAGE TO THE EXTERIOR REAR VIEW MIRROR SWITCH

- Disconnect: Exterior Rear View Mirror Switch C527.

- Measure the voltage between exterior rear view mirror switch C527-6, circuit SBP16 (VT/RD), harness side and ground.





Is the voltage greater than 10 volts?

Yes
GO to A2.

No
VERIFY that CJB (Central Junction Box) fuse 16 (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 Electrical Diagrams. TEST the system for normal operation.

A2 CHECK FOR GROUND TO THE EXTERIOR REAR VIEW MIRROR SWITCH

- Measure the resistance between exterior rear view mirror switch C527-4, circuit GD143 (BK/VT), harness side and ground.





Is the resistance less than 5 ohms?

Yes
GO to A3.

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

A3 CHECK THE EXTERIOR REAR VIEW MIRRORS COMMON CIRCUIT FOR AN OPEN

- Disconnect: LH Exterior Rear View Mirror Switch C521.

- Measure the resistance between exterior rear view mirror switch C527-3, circuit CPM18 (GN/BN), harness side and LH exterior rear view mirror C521-6, circuit CPM18 (GN/BN) harness side.





Is the resistance less than 5 ohms?

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

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