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Test 12A - Bus Short To Ground

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION  and WIRING DIAGRAMS  . Perform TEST VER-2A - VERIFICATION PROCEDURE  after each repair.
CAUTION: Always turn ignition off prior to disconnecting any module connector.
NOTE: For appropriate wire color tracers (example, Black/*), see WIRING DIAGRAMS  .
  1. Connect backprobe jumper wire between Data Link Connector (DLC) ground terminals No. 4 (Black/* wire) and No. 5 (Black/* wire). If scan tool does not display BUS SHORT TO GROUND, repair open ground wire. See WIRING DIAGRAMS  . If scan tool displays BUS SHORT TO GROUND, go to next step.
  2. Turn ignition off. Disconnect Transmission Control Module (TCM), if equipped. TCM is located next to washer fluid reservoir. Turn ignition on. If scan tool does not display BUS SHORT TO GROUND, replace TCM. If scan tool displays BUS SHORT TO GROUND, go to next step.
  3. Turn ignition off and disconnect Powertrain Control Module (PCM). PCM is located next power distribution center on left inner fenderwell. 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 and disconnect CCD radio 2-pin connector. Turn ignition on. If scan tool does not display BUS SHORT TO GROUND, isolate CCD radio 2-pin connector and tape to harness. If scan tool displays BUS SHORT TO GROUND, go to next step.
  5. Turn ignition off. Disconnect compass/mini-trip module. Turn ignition on. If scan tool does not display BUS SHORT TO GROUND, replace compass/mini-trip module. 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 anti-lock brake controller. Turn ignition on. If scan tool does not display BUS SHORT TO GROUND, replace anti-lock brake controller. If scan tool displays BUS SHORT TO GROUND, go to next step.
  8. Turn ignition off. Disconnect Body Control Module (BCM) connectors. BCM is located on back of junction block, under left side of instrument panel. 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.
  9. Turn ignition off and wait 5 minutes. Disconnect Air Bag Control Module (ABCM) 13-pin connector. ABCM is located under center of instrument panel. Turn ignition on. If scan tool does not display BUS SHORT TO GROUND, replace ABCM. If scan tool displays BUS SHORT TO GROUND, go to next step.
  10. Using external ohmmeter, measure resistance between BCM connector "A", terminal No. 3 (Violet/Brown wire) and ground. If resistance is 5 ohms or more, repair White/Black wire for short to ground. If resistance is less than 5 ohms, repair Violet/Brown wire for short to ground.
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