B1635

Step 1: Visually inspect the right side mirror connector and wiring harness in the door jamb area for obvious damage, corrosion, water intrusion, or loose connections. Check for bent pins or pushed-back terminals in the connector.

Step 2: Using a digital multimeter, test for power and ground at the mirror connector while commanding the mirror to move in all directions through the mirror switch or scan tool actuator test. Verify voltage changes appropriately (typically 12V switching polarity for each direction).

Step 3: If power and ground are present at the connector, disconnect the mirror and test the mirror motor resistance across the motor terminals (typically 3-8 ohms for each motor). Compare readings to manufacturer specifications and test for shorts to ground on each terminal.

Step 4: If mirror motor tests good, check continuity and resistance of all wiring from the BCM connector to the mirror connector, looking for opens, shorts to ground, or shorts to power. Pay special attention to wiring flex points in door hinge area.

Step 5: If all wiring and mirror motor test within specifications, suspect BCM internal driver circuit failure. Verify BCM ground connections are solid and check for technical service bulletins related to BCM mirror circuit failures before replacing BCM.

Step 6: After repair, clear codes and perform functional test of mirror movement in all directions (up, down, left, right) to confirm proper operation and verify code does not return.