Pinpoint Test B: The Heated Exterior Mirror is Inoperative

Rear View Mirrors - Exterior

Pinpoint Test B: The Heated Exterior Mirror is Inoperative

Normal Operation

When the rear window defrost switch is pressed, the rear window defrost relay closes. When the rear window defrost relay is closed, voltage is supplied through circuit CRD06 (BN/YE) to Battery Junction Box (BJB) fuse 49 (10A). The heated exterior mirrors receive voltage through circuit CRD13 (GN/VT), from BJB (Battery Junction Box) fuse 49 (10A). Ground is supplied to the LH heated exterior mirror through circuit GD133 (BK) and to the RH heated exterior mirror through circuit GD145 (BK/BU).

This pinpoint test is intended to diagnose the following:

- Fuse

- Wiring, terminals or connectors

- Exterior mirror glass

- Exterior mirror

PINPOINT TEST B : THE HEATED EXTERIOR MIRROR IS INOPERATIVE

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

B1 CHECK THE OPERATION OF THE REAR WINDOW DEFROST SYSTEM

- With the engine running, depress the rear window defrost switch to the ON position.

- Place a hand on the rear window to verify that the rear window heats up.

Does the rear window defrost system operate?

Yes
GO to B2.

No
REFER to Windows and Glass to diagnose the rear window defrost system.

B2 CHECK THE VOLTAGE TO THE INOPERATIVE EXTERIOR MIRROR

- Ignition OFF.

- Disconnect: LH Exterior Mirror C516 or RH Exterior Mirror C625.

- With the engine running, depress the rear window defrost switch to the ON position.

- Measure the voltage between ground and inoperative exterior mirror:
- LH:C516-6, circuit CRD13 (GN/VT), harness side.

- RH:C625-6, circuit CRD13 (GN/VT), harness side.






Is the voltage greater than 10 volts?

Yes
GO to B3.

No
VERIFY that BJB (Battery Junction Box) fuse 49 (10A) is OK. If OK, REPAIR the open in circuit CRD13 (GN/VT) or circuit CRD06 (BN/YE). If not OK, Refer to the Wiring Diagrams to identify the possible causes of the circuit short. TEST the system for normal operation. Electrical Diagrams

B3 CHECK THE INOPERATIVE EXTERIOR MIRROR GROUND CIRCUIT FOR AN OPEN

- Ignition OFF.

- Measure the resistance between ground and inoperative exterior mirror:
- LH:C516-7, circuit GD133 (BK), harness side.

- RH:C625-7, circuit GD145 (BK/BU), harness side.






Is the resistance less than 5 ohms?

Yes
CHECK the LH or RH exterior mirror jumper harness between the vehicle harness and the exterior mirror glass 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 LH or RH exterior mirror. REFER to Exterior Mirror . If the jumper harness is OK, INSTALL a new LH or RH exterior mirror glass. REFER to Exterior Mirror Glass . TEST the system for normal operation.

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