• | 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 | B1640 02 | 1 | B1640 01 | -- |
Low Reference | -- | 1 | 1 | -- |
1. Heated Mirror Malfunction |
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 module 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.
Battery voltage must be between 9-16 volts.
A short to voltage is detected on the mirror heating element supply voltage circuit while the heated mirrors are inactive.
A short to ground is detected on the mirror heating element supply voltage circuit while the heated mirrors are active.
The affected heated mirror will be disabled.
• | 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
Control Module References for scan tool information
Ignition ON, press the rear window defogger switch. The rear window defogger and both heated mirrors should become warm.
⇒ | If the test lamp illuminates, test the control circuit for a short to voltage. |
⇒ | 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. |
⇒ | 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. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for DDM or PDM replacement, setup and programming |