Circuit/System Testing
WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the X7 harness connector at the appropriate door module.
- Ignition ON, verify a test lamp does not illuminate between the following circuit terminals and ground:
- 5-volt reference circuit terminal 7
- Signal circuit terminal 4
- Signal circuit terminal 5
- Low reference circuit terminal 10
- If the test lamp illuminates, test the appropriate circuit for a short to voltage.
- Ignition OFF, test for infinite resistance between the following circuits and ground:
- 5-volt reference circuit terminal 7
- Signal circuit terminal 4
- Signal circuit terminal 5
- Low reference circuit terminal 10
- If less than the specified value, test the appropriate circuit for a short to ground.
- Test for 4K-7K ohms between the 5-volt reference circuit terminal 7 and the low reference circuit terminal 10.
- If not within the specified range, test the 5-volt reference circuit and the low reference circuit for an open/high resistance. If the circuits test normal, test or replace the rearview mirror.
- Test for 1K-7K ohms between the 5-volt reference circuit terminal 7 and the signal circuit terminal 4.
- If not within the specified range, test the signal circuit for an open/high resistance. If the circuits test normal, test or replace the rearview mirror.
- Test for 1K-7K ohms between the 5-volt reference circuit terminal 7 and the signal circuit terminal 5.
- If not within the specified range, test the signal 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.