Circuit/System Testing
- Verify that a test lamp illuminates between the SDM or XM/ONSTAR fuse 24 in the BCM 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, disconnect the harness connectors at the BCM.
- Test for less than 5 ohms between the ground circuit terminal E12 X4 and ground.
- If greater than the specified range, test the ground circuit for an open/high resistance.
- Verify that a test lamp illuminates between the B+ circuit terminals listed below and ground.
- Terminal D1 X3
- Terminal D12 X3
- If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
- Test for less than 5 ohms between the B+ circuit terminal 62 X1 and terminal B3 X3.
- If greater than the specified range, test the B+ circuit for an open/high resistance.
- If all circuits test normal, replace the BCM.