Circuit/System Testing
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector X3 at the appropriate door switch.
- Ignition ON, verify a test lamp does not illuminate between the following control circuit terminals and ground:
- Control circuit terminal 1
- Control circuit terminal 2
- Control circuit terminal 6
- If the test lamp illuminates, test the appropriate control circuit for a short to voltage.
- Ignition OFF, test for infinite resistance between the following control circuits and ground:
- Control circuit terminal 1
- Control circuit terminal 2
- Control circuit terminal 6
- If less the specified value, test the appropriate control circuit for a short to ground.
- Test for 40-100 ohms of resistance between the control circuit terminal 1 and the control circuit terminal 6.
- If not within the specified range, test both control circuit for an open/high resistance. If the circuits test normal, test or replace the rearview mirror motor.
- Test for 40-100 ohms of resistance between the control circuit terminal 2 and the control circuit terminal 6.
- If not within the specified range, test both control circuit for an open/high resistance. If the circuits test normal, test or replace the rearview mirror motor.
- If all circuits test normal, replace the appropriate door switch.