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Bus Short To Ground

NOTE: After making any repairs, perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  1. Connect scan tool to Data Link Connector (DLC). DLC is located under driver's side of instrument panel, right of steering column. Using a jumper wire, backprobe between terminals No. 4 (Black/Light Green wire) and No. 5 (Black/White wire) at DLC. If scan tool does not display BUS SHORT TO GROUND, repair open in ground wire. If scan tool displays BUS SHORT TO GROUND, go to next step.
  2. Turn ignition off. If vehicle is not equipped with Transmission Control Module (TCM), go to next step. If vehicle is equipped with TCM, disconnect TCM located on right fenderwell, next to washer reservoir. Turn ignition on. If scan tool displays BUS SHORT TO GROUND, go to next step. If scan tool does not display BUS SHORT TO GROUND, replace TCM. Set pinion factor to ensure correct tire size is set for proper speedometer operation. See appropriate PINION FACTOR PROCEDURE in COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION.
  3. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. PCM is located in engine compartment between left inner fender and power distribution center. Turn ignition on. If scan tool does not display BUS SHORT TO GROUND, replace PCM. If scan tool displays BUS SHORT TO GROUND, go to next step.
  4. Turn ignition off. Disconnect CCD radio Black 2-pin connector from back of radio. Turn ignition on. If scan tool does not display BUS SHORT TO GROUND, replace radio. If scan tool displays BUS SHORT TO GROUND, go to next step.
  5. Turn ignition off. If vehicle is not equipped with Compass/Mini-Trip Computer (CMTC), go to next step. If vehicle is equipped with CMTC, disconnect CMTC located behind overhead console. Turn ignition on. If scan tool does not display BUS SHORT TO GROUND, replace CMTC. If scan tool displays BUS SHORT TO GROUND, go to next step.
  6. Turn ignition off. Disconnect instrument cluster. Turn ignition on. If scan tool does not display BUS SHORT TO GROUND, replace instrument cluster. If scan tool displays BUS SHORT TO GROUND, go to next step.
  7. Turn ignition off. Disconnect Controller Anti-Lock Brake (CAB) module. CAB module is located on right side of engine compartment and has a Black 25-pin connector. Turn ignition on. If scan tool does not display BUS SHORT TO GROUND, replace CAB module. If scan tool displays BUS SHORT TO GROUND, go to next step.
  8. Turn ignition off. Disconnect Heating/Ventilation Air Conditioning (HVAC) module. HVAC control module is part of heating-A/C control assembly in center of instrument panel. Turn ignition on. If scan tool does not display BUS SHORT TO GROUND, replace HVAC module. If scan tool displays BUS SHORT TO GROUND, go to next step.
  9. Turn ignition off. Disconnect Body Control Module (BCM) connectors. BCM is located with junction block under driver's side instrument panel. See Figure . Turn ignition on. If scan tool does not display BUS SHORT TO GROUND, replace BCM. If scan tool displays BUS SHORT TO GROUND, go to next step.
  10. Turn ignition off and wait 2 minutes for air bag system back-up power source to discharge. Disconnect Air Bag Control Module (ACM) 13-pin connector. ACM is located under center of instrument panel. Turn ignition on. If scan tool does not display BUS SHORT TO GROUND, replace ACM. If scan tool displays BUS SHORT TO GROUND, go to next step.
  11. Disconnect scan tool from DLC. Measure resistance between ground and terminal No. 3 (Violet/Brown wire) at BCM connector "A". If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Violet/Brown wire.
  12. Measure resistance between ground and terminal No. 34 (White/Black wire) at BCM connector "A". If resistance is 5 ohms or more, replace scan tool cable or scan tool as necessary. If resistance is less than 5 ohms repair short to ground in White/Black wire.
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