Circuit/System Testing
WARNING: This page is about a different car, the 2008 Pontiac G8. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the X3 harness connector at the BCM.
- Verify that a test lamp illuminates between the BCM F9 fuse B+ circuit terminal 3 and ground.
- If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
- Ignition OFF, connect the X3 harness connector at the BCM.
- Disconnect the harness connector at the turn signal/multifunction switch.
- Ignition ON, test for B+ between the B+ circuit terminal 6 and ground.
- If less than the specified value, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
- Ignition ON, test for B+ between the B+ circuit terminal 6 and the signal circuit terminal 5.
- If less than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
- Ignition ON, verify that a test lamp does not illuminate between B+ and the signal circuit terminal 5.
- If the test lamp illuminates, test the signal circuit for a short to ground. If the circuit test normal, replace the BCM.
- If all circuits test normal, test or replace the turn signal/multifunction switch.