Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the A10 inside rearview mirror.
- Wait 1 minute, test for less than 10 Ω between the ground circuit terminal 5 and ground.
- If greater than the specified range, test the ground circuit for an open/high resistance.
- Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 2 and ground.
- If the test lamp does not illuminate test the ignition circuit for an open/high resistance or short to ground.
- Engine running, park brake applied, vehicle in REVERSE, verify that a test lamp illuminates between the backup lamp control circuit terminal 1 and ground.
- If all circuits test normal, test or replace the A10 inside rearview mirror.