B1544
DTC B1544, B1600, or B1605
Circuit Description
The driver door switch (DDS) and passenger door switch (PDS) supply battery positive voltage and ground on opposing mirror motor control circuits upon receipt of a mirror switch activation or a GMLAN message commanding mirror control, memory recall or mirror tilt in reverse functions.
DTC Descriptors
This diagnostic procedure supports the following DTCs:
* DTC B1544 Mirror Motors Common Circuit
* DTC B1600 Mirror Motor Vertical Circuit
* DTC B1605 Mirror Motor Horizontal Circuit
Conditions for Running the DTC
* System voltage must be between 9-16 volts.
* The mirror motor control circuits must be active.
Conditions for Setting the DTC
* If the mirror motor control circuits are switched to battery voltage and the mirror motor control circuit is shorted to ground.
* If the mirror motor control circuits are switched to ground and the mirror motor control circuit is shorted to battery voltage.
Action Taken When the DTC Sets
The outside rearview mirror will not operate properly on all axis.
Conditions for Clearing the DTC
When the fault is no longer present, the door module changes the current DTC to a history DTC. The door module will clear the history DTC after 50 fault-free ignition cycles, or in response to a scan tool command.
Test
