• | 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 |
---|---|---|---|---|
Left/Right Mirror Horizontal Motor Control | B1544 04, B1605 02 | B1544 04, B1605 04 | B1605 01 | -- |
Left/Right Mirror Vertical Motor Control | B1544 04, B1600 02 | B1544 04, B1600 04 | B1600 01 | -- |
Left/Right Mirror Motor Common Control | B1544 04, B1600 04, B1605 04, B1544 02 | B1544 04, B1600 04, B1605 04 | B1544 01 | -- |
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 the DDM. When the power mirror switch is activated to the up, down, left or right positions, the DDM responds by commanding the driver mirror to the desired position. The DDM also sends a GMLAN serial data message to the PDM to command the passenger mirror to the appropriate position. Each door module commands their respective mirror motors by applying a ground or voltage to the control circuit, depending on the desired mirror position.
Battery voltage must be between 9-16 volts.
An improper voltage level is detected on the mirror motor common control circuit.
An improper voltage level is detected on the mirror motor vertical control circuit.
An improper voltage level is detected on the mirror motor horizontal control circuit.
• | When DTC B1544 is present, all mirror controls will be disabled. |
• | When DTC B1600 is present, the vertical mirror control will be disabled. |
• | When DTC B1605 is present, the horizontal mirror control will be disabled. |
• | A current DTC will clear when the fault is no longer present |
• | A history DTC will clear after 40 fault free ignition cycles |
Outside Rearview Mirror Schematics
Outside Mirror Description and Operation
Control Module References for scan tool information
Command the left and right outside mirror to move up, down, left and right using the mirror directional switch. The mirror should move in the commanded direction.
⇒ | If the test lamp remains OFF during either of the commands, test for a short to voltage, short to ground, or an open/high resistance on either control circuit. If the circuits test normal, replace the DDM. |
⇒ | If the test lamp remains OFF during either of the commands, test for a short to voltage, short to ground, or an open/high resistance on either control circuit. If the circuits test normal, replace the DDM. |
⇒ | If the test lamp remains OFF during either of the commands, test for a short to voltage, short to ground, or an open/high resistance on either control circuit. If the circuits test normal, replace the PDM. |
⇒ | If the test lamp remains OFF during either of the commands, test for a short to voltage, short to ground, or an open/high resistance on either control circuit. If the circuits test normal, replace the PDM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for DDM or PDM replacement, setup, and programming |