No Response From Body Control Module (Bus +/- Signal Open)
NOTE:
After making any repairs, perform BODY VERIFICATION TEST
under VERIFICATION TESTS.
- Turn ignition off. Disconnect junction block harness connector C2. See Figure . Measure resistance between ground and terminal No. 8 (Black/Orange wire) at junction block harness connector C2. See Fig 1 . If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, repair open in Black/Orange wire between ground and junction block.
- Disconnect junction block harness connector C3. See Figure . Measure resistance between ground and terminal No. 4 (Black/Light Green wire) at junction block harness connector C3. See Fig 2 . If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, repair open in Black/Light Green wire between ground and junction block.
- Disconnect Body Control Module (BCM) from back for junction block. Turn ignition on. Measure voltage at terminal No. 7 at BCM connector on back of junction block. If battery voltage exists, go to next step. If battery voltage does not exist, replace junction block.
- Turn ignition off. Connect junction block harness connector C2. Measure resistance between ground and terminal No. 1 at BCM connector on back of junction block. If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, replace junction block.
- Connect junction block harness connector C3. Measure resistance between ground and terminal No. 20 at BCM connector on back of junction block. If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, replace junction block.
- Disconnect BCM harness connector C1. Measure resistance between ground and terminal No. 2 (Violet/Yellow wire) at Data Link Connector (DLC). See Figure . If resistance is greater than 1000 ohms, go to next step. If resistance is 1000 ohms or less, repair short to ground in Violet/Yellow wire between BCM and DLC.
- Turn ignition on. Measure voltage at terminal No. 2 (Violet/Yellow wire) at DLC. If voltage does not exist, go to next step. If voltage exists, repair short to voltage in Violet/Yellow wire between BCM and DLC.
- Measure resistance in Violet/Yellow wire between terminal No. 2 at DLC and terminal No. 14 at BCM harness connector C1. See Figure and Figure . If resistance is 5 ohms or less, replace BCM. If resistance is greater than 5 ohms, repair open in Violet/Yellow wire between BCM and DLC.