Circuit/System Testing
WARNING: This page is about a different car, the 2012 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the S56 radio control multifunction switch.
- Test for less than 10 Ω between ground circuit terminal 2 and ground.
- If greater than the specified range, test the ground circuit for an open/high resistance.
- Ignition ON, verify that a test lamp illuminates between B+ circuit terminal 1 and ground.
- If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
- Test for 2-11.5 V between the serial data circuit terminal 3 and ground.
- If greater than the specified range, test the serial data circuit for a short to voltage. If the circuit tests normal, replace the A22 radio controls.
- If less than the specified range, test the serial data circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the A22 radio controls.
- If all circuits test normal, replace the S56 radio control multifunction switch.