Bus +/- Signals Open From Body Control Module
NOTE:
After making any repairs, perform BODY CONTROL MODULES SYSTEM VERIFICATION TEST
under VERIFICATION TESTS.
- Turn ignition off. Disconnect junction block connector C2. See Figure . Measure resistance between ground and junction block connector C2 terminal No. 8, ground circuit (Black/Orange wire). See Fig 1 . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/Orange wire.
- Disconnect junction block connector C3. Measure resistance between ground and junction block connector C3 terminal No. 4, ground circuit (Black/Light Green wire). See Fig 2 . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/Light Green wire.
- Ensure ignition is off. Remove Body Control Module (BCM) from back of junction block. Using a 12-volt test light connected to ground, probe terminal No. 7, fused B+ circuit at BCM connector on back of junction block. If test light illuminates, leave BCM removed, and go to next step. If test light does not illuminate, replace junction block.
- Connect junction block connector C2. Measure resistance between ground and terminal No. 1, ground circuit at BCM connector on back of junction block. If resistance is less than 5 ohms, leave BCM removed, and go to next step. If resistance is 5 ohms or more, replace junction block.
- Connect junction block connector C3. Measure resistance between ground and terminal No. 20, ground circuit at BCM connector on back of junction block. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, replace junction block.
- Disconnect BCM connector C1. Measure resistance between ground and Data Link Connector (DLC) terminal No. 2, PCI bus circuit (Violet/Yellow wire). See Fig 3 . If resistance is more than 100 ohms, go to next step. If resistance is 100 ohms or less, repair short to ground in Violet/Yellow wire.
- Turn ignition on. Measure voltage on DLC terminal No. 2, PCI bus circuit (Violet/Yellow wire). If voltage does not exist, go to next step. If voltage exists, repair short to voltage in Violet/Yellow wire.
- Measure resistance in PCI bus circuit (Violet/Yellow wire) between DLC terminal No. 2 and BCM connector C1 terminal No. 14. See Figure and Fig 3 . If resistance is less than 5 ohms, replace BCM. If resistance is 5 ohms or more, repair open in Violet/Yellow wire.