Test 143A - Repairing Ignition Circuit
CAUTION:
Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.
- Remove and inspect fuse No. 14. See Fig 1. If fuse is okay, go to step 4). If fuse is open, turn ignition switch to OFF position. Using scan tool in ohmmeter mode, check resistance of fuse No. 14 terminal (Dark Blue wire). If resistance is more than 5 ohms, replace fuse. If resistance is less than 5 ohms, go to next step.
- Disconnect Body Control Module (BCM) Bone connector. Ensure connector is clean and undamaged. Check resistance of BCM Bone connector terminal No. 13 (Dark Blue/White wire). If resistance is less than 5 ohms, repair Dark Blue/White wire and replace fuse. If resistance is more than 5 ohms, replace BCM and fuse.
- Using scan tool in voltmeter mode, check voltage on fuse No. 14 terminal (Dark Blue wire). If voltage is less than 10 volts, repair open Dark Blue wire. If voltage is more than 10 volts, go to next step.
- Reinstall fuse No. 14. Turn ignition switch to OFF position. Disconnect BCM Bone connector. Ensure connector is clean and undamaged. Turn ignition switch to ON position, with engine off. Check voltage on BCM Bone connector terminal No.13 (Dark Blue/White wire). If voltage is less than 10 volts, repair open Dark Blue/White wire. If voltage is more than 10 volts, replace BCM.