Circuit/System Testing
WARNING: This page is about a different car, the 2008 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the X2 harness connector at the BCM.
- Verify that a test lamp illuminates between the B+ circuit terminal 2 and ground.
- If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the supply voltage circuits listed below for a short to ground.
- Instrument panel lamp supply voltage circuit terminal 3 X2
- Instrument panel lamp supply voltage circuit terminal 3 X6
- If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the supply voltage circuits listed below for a short to ground.
- Ignition OFF, connect the X2 harness connector at the BCM.
- Disconnect the harness connectors at all components fed by the BCM supply voltage circuits listed below.
- Instrument panel lamp supply voltage circuit terminal 3 X2
- Instrument panel lamp supply voltage circuit terminal 3 X6
- Ignition ON, clear the DTC with a scan tool.
- Operate the system within the Conditions for Running the DTC and verify the DTC does not reset.
- If the DTC resets, test the supply voltage circuits for a short to ground. If the circuits test normal, replace the BCM.
- Reconnect each component one at a time and verify that the DTC does not reset.
- If the DTC resets, test or replace the component responsible for setting the DTC.