Circuit/System Testing
WARNING: This page is about a different car, the 2017 GMC Acadia Limited, 2017 Chevrolet Traverse, and 2017 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the A10 inside rearview mirror.
- Test for less than 10 Ω between the mirror ground circuit terminal 8 and ground.
- If greater than the specified range, test the ground circuit for an open/high resistance.
- Ignition ON, test for less than 1 V between the keypad signal circuit terminal 11 and ground.
- If greater than the specified range, test the keypad signal circuit for a short to voltage. If the circuit tests normal, replace the CIM.
- Ignition OFF, test for 600k - 800k Ω between the keypad signal circuit terminal 11 and ground.
- If less than the specified range, test the keypad signal circuit for a short to ground. If the circuit tests normal, replace the CIM.
- If greater than the specified range, test the keypad signal circuit for an open/high resistance. If the circuit tests normal, replace the CIM.
- Ignition ON, test for 9.5 - 10.5 V between the keypad supply voltage circuit terminal 12 and ground.
- If less than the specified range, test the supply voltage circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the CIM.
- If greater than the specified range, test the supply voltage circuit for a short to voltage. If the circuit tests normal, replace the CIM.
- If all circuits test normal, test or replace the button assembly.