Cruze

Heated Mirrors Malfunction

The rear demister relay supplies voltage to the outside rearview mirror heater elements based on the current state of the rear window demister. The relay supplies B+ through the driver/passenger mirror heating element control circuit when a request is seen.

Schematic Reference

Outside Rearview Mirror Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Outside Mirror Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information.

1. Engine running, press the rear window demister switch. Verify the rear window demister turns ON and the rear window becomes warm.

⇒	If the rear window demister does not turn on, refer to Rear Window Defogger Malfunction .

2. Verify both the left and right outside mirror glass become warm.

1. Ignition OFF, disconnect the harness connector at the appropriate A9 outside rearview mirror.
2. Wait 1 minute, test for less than 10 Ω between the ground circuit terminal G and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

3. Connect a test lamp between the heater element control circuit terminal F and ground.
4. Engine running, operate the rear window demister ON and OFF with the rear demister switch. The test lamp should turn ON and OFF when changing between the commanded states.

⇒	If the test lamp is always ON, test the control circuit for a short to voltage.

⇒	If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance.

5. If all circuits test normal, test or replace the outside rearview mirror glass.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Outside Rearview Mirror Glass Replacement