Circuit/System Testing

Ignition OFF, disconnect the harness connector at the GBCM.
Ignition OFF, scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the following ground circuit terminals and ground:
- Terminal F
- Terminal H
- If greater than the specified range, test the ground circuit for an open/high resistance.
Ignition ON, verify that a test lamp illuminates between the following B+ circuits and ground:
- Terminal A
- Terminal C
- If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
If all circuits test normal, replace the GBCM.