• | 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 Supply Voltage | B1640 02 | 1 | B1640 01 | -- |
Low Reference | -- | 1 | 1 | -- |
1. Heated Mirror Malfunction |
The Driver Door Switch (DDS) and Passenger Door Switch (PDS) 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 mirror heating element control circuit when a request is seen. Ground is applied through the mirror heating low reference circuit.
The heated mirrors are commanded ON.
A short to voltage is detected on the mirror heating element supply voltage circuit while the heated mirrors
A short to ground is detected on the mirror heating element supply voltage circuit while the heated mirrors
The affected heated mirror will not be activated.
• | A current DTC will clear when the fault is no longer present . |
• | A history DTC will clear after 40 malfunction free ignition cycles. |
Outside Rearview Mirror Schematics
Outside Mirror Description and Operation
Ignition ON, press the rear window defogger switch. The rear window defogger and both heated mirrors should become warm.
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the appropriate door switch. |
⇒ | If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the appropriate door switch. |
⇒ | 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 appropriate door switch. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for DDS or PDS replacement, setup and programming |