Power Mirrors Inoperative

Power Mirrors Inoperative

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information






Circuit/System Description

The outside rearview mirror switch controls the outside rearview mirrors based on the position of the mirror selector switch and which movement position is selected. The outside rearview mirror switch has four positions: up, down, left, and right. B+ is applied to the switch and when a movement position switch is selected, B+ is sent to the mirror via a motor control circuit. The opposite motor control circuit acts as a ground circuit for the bi-directional mirror motor.

Circuit/System Verification

1. Ignition ON, with the mirror selector switch in the DRIVER position, command the mirrors UP, DOWN, LEFT, and RIGHT using the mirror directional switch. The driver mirror should move in the commanded direction.
2. Ignition ON, with the mirror selector switch in the PASSENGER position, command the mirrors UP, DOWN, LEFT, and RIGHT using the mirror directional switch. The passenger mirror should move in the commanded direction.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate outside rearview mirror.
2. Mirror select switch in the appropriate mirror position, test for infinite resistance between the control circuit terminal C and ground.

^ If less than the specified range, test the control circuit for a short to ground. If the circuit tests normal, replace the front side door window switch.

3. Test for infinite resistance between the control circuit terminals A and B and ground.

^ If less than the specified range, test the appropriate control circuit for a short to ground. If the circuits test normal, replace the front side door window switch.

4. Connect a test lamp between the control circuit terminal B and the control circuit terminal C.
5. Operate the vertical switch UP and DOWN. The test lamp should turn ON when commanding the UP and DOWN states.

^ If the test lamp remains OFF during either of the commands, test for an open/high resistance on the control circuits. If the circuits test normal, replace the front side door window switch.

6. Connect a test lamp between the control circuit terminal A and the control circuit terminal C.
7. Operate the horizontal switch LEFT and RIGHT. The test lamp should turn ON when commanding the LEFT and RIGHT states.

^ If the test lamp remains OFF during either of the commands, test for an open/high resistance on the control circuits. If the circuits test normal, replace the front side door window switch.

8. If all circuits test normal, test or replace the outside rearview mirror motor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Front Side Door Window Switch Replacement (Impala)
* Outside Rearview Mirror Motor Replacement