• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Mirror Heating Element Control | 1 | 1 | 1 | -- |
Low Reference | -- | 1 | 1 | -- |
1. Heated Mirror Malfunction |
The outside rearview mirrors heat during the defrost/defog cycles for the rear window. The driver door module (DDM) and passenger door module (PDM) control the heated mirror functions. When the door modules receive a message from the HVAC control module indicating the rear defogger has been turned ON, both door modules will activate the heated mirror by applying voltage to the heated mirror element control circuit.
Outside Rearview Mirror Schematics
Outside Mirror Description and Operation
Control Module References for scan tool information
⇒ | If the rear window defogger indicator does not illuminate, refer to Rear Window Defogger Malfunction. |
⇒ | If the test lamp does not illuminate, test the ground circuit for an open/high resistance. |
⇒ | If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the door control module. |
⇒ | If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the door control module. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for DDM or PDM replacement, setup, and programming |