Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the X3 harness connector at the appropriate door module.
- 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 between the control circuit terminal 1 and the control circuit terminal 6.
- If not within the specified range, test both control circuits for an open/high resistance. If the circuits test normal, test or replace the rearview mirror.
- Test for 40-100 ohms 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.
- If all circuits test normal, replace the door module.