Heated Mirrors Malfunction
Diagnostic Instructions
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Heated Mirror Element Control
|
1
|
1
|
2
|
-
|
Ground
|
-
|
1
|
-
|
-
|
1. Heated Mirror Inoperative
2. Heated Mirror Always On
|
|
|
Circuit/System Description
The rear defogger relay supplies voltage to the outside rearview
mirror heater elements based on the current state of the rear
window defogger. The relay supplies B+ through the driver/passenger
mirror heating element control circuit when a request is seen.
Reference Information
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
Circuit/System Verification
1. |
Engine running, press the rear
window defogger switch. Verify the rear window defogger turns ON
and the rear window becomes warm. |
2. |
Verify both the left and right
outside mirror glass become warm. |
Circuit/System Testing
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 7 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 6 and ground.
|
4. |
Engine running, operate the
rear window defogger ON and OFF with the rear defogger 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. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
Outside Rearview Mirror Glass Replacement
|