Component Testing
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the inside rearview mirror.
- Test for infinite resistance between the keypad supply voltage circuit terminal 12 and the keypad signal circuit terminal 11.
- If less than the specified range, replace the inside rearview mirror.
- Test for 1.4K-1.6k ohms between the keypad supply voltage circuit terminal 12 and the keypad signal circuit terminal 11 while pressing the black phone button.
- If not within the specified range, replace the inside rearview mirror.
- Test for 2.7K-3.3k ohms between the keypad supply voltage circuit terminal 12 and the keypad signal circuit terminal 11 while pressing the blue On-Star® button.
- If not within the specified range, replace the inside rearview mirror.
- Test for 11.7K-14.3k ohms between the keypad supply voltage circuit terminal 12 and the keypad signal circuit terminal 11 while pressing the red emergency button.
- If not within the specified range, replace the inside rearview mirror.
- If the inside rearview mirror tests normal, go to Circuit/System Testing .