The driver door module (DDM) and passenger door module (PDM) each provide motor control output functions for their respective mirrors. These output controls allow each door module to command their respective power mirrors in horizontal and vertical positions. The power mirror switch is integrated into DDM. When the DDM detects an active mirror command from the power mirror switch, the DDM will send a GMLAN serial data message to the PDM. Each door module will command there respective mirror motor in the appropriate direction by applying ground or voltage to the control circuit, depending on the desired mirror position. For more detailed information concerning power mirror operation refer to Outside Mirror Description and Operation .

An open on either the low reference circuit or the 5-volt reference circuit may cause incorrect or no movement during parking maneuvers in reverse.

Schematic Reference

Outside Rearview Mirror Schematics

Connector End View Reference

Mirror Connector End Views

Electrical Information Reference

Scan Tool Reference

Ignition ON, operate both left and right mirrors to all possible positions with the power mirror switch. Both mirrors should operate as the switch is activated.

1. Ignition ON, verify the mirror to curb in reverse feature is activated for both driver and passenger mirrors in vehicle personalization. Refer to Vehicle Personalization .
2. If the mirror to curb in reverse option is activated, replace the appropriate door control module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for DDM or PDM replacement, setup, and programming