Heated Mirrors Inoperative
Heated Mirrors Inoperative
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The driver door module (DDM) and passenger door module (PDM) supply voltage to the outside rearview mirror heater elements upon receipt of a serial data message from the HVAC module indicating that the rear defrost system is active. The door switch supplies B+ through the driver/passenger mirror heating element control circuit when a request is seen. Ground is applied through the driver/passenger mirror heating low reference circuit.
Reference Information
Schematic Reference
Outside Rearview Mirror Schematics (Outside Rearview Mirror Schematics)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Outside Mirror Description and Operation (Heated Mirrors) (Outside Mirror Description and Operation (Heated Mirrors))Outside Mirror Description and Operation (Power Mirrors) (Outside Mirror Description and Operation (Power Mirrors))
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
1. Ignition ON, press the rear window defogger switch. Verify the rear window defogger indicator illuminates.
• If the rear window defogger indicator does not illuminate, refer to Rear Window Defogger Malfunction (Rear Window Defogger Malfunction).
2. Rear window defogger ON, verify both the left and right outside mirror glass become warm.
Circuit/System Testing
1. Ignition OFF, disconnect the X3 harness connector at the appropriate door module.
2. Ignition ON, verify a test lamp does not illuminate between the control circuit terminal B7 and ground.
• If the test lamp illuminates, test the control circuit for a short to voltage.
3. Ignition OFF, test for infinite resistance between the control circuit terminal B7 and ground.
• If less than the specified value, test the control circuit for a short to ground. If the circuit tests normal, test or replace the rearview mirror glass.
4. Test for 5-10 ohms of resistance between the control circuit terminal B7 and the low reference circuit terminal B3.
• If not within the specified range, test the control circuit and the low reference circuit for an open/high resistance. If the circuits test normal, test or replace the rearview mirror glass.
5. If all circuits test normal, replace the door module.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Outside Rearview Mirror Glass Replacement (Outside Rearview Mirror Glass Replacement)
* Control Module References (Programming and Relearning) for DDM or PDM replacement, setup and programming