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Bus Short To Ground

  1. Ensure ignition is on. With scan tool connected to Data Link Connector (DLC), backprobe a jumper wire between DLC connector terminals No. 4 (Black/Light Blue wire) and No. 5 (Black/Tan wire). If scan tool displays BUS SHORT TO GROUND, remove jumper wire and go to next step. If scan tool does not display BUS SHORT TO GROUND, repair open in Black/Tan wire. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  2. Turn ignition off. Disconnect Powertrain Control Module (PCM). See COMPONENT LOCATIONS  . 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 PCM. See POWERTRAIN CONTROL MODULE  under REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  3. Turn ignition off. Disconnect Transmission Control Module (TCM), if equipped. See Figure . 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. See TRANSMISSION CONTROL MODULE  under REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  4. Turn ignition off. Disconnect Compass/Mini-Trip Computer (CMTC), if equipped. 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 CMTC. See OVERHEAD CONSOLE  under REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  5. Turn ignition off. Disconnect Remote Keyless Entry (RKE) module, if equipped. 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 RKE module. See REMOTE KEYLESS ENTRY MODULE  under REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
    WARNING: Disconnect battery and wait 2 minutes before disconnecting air bag control module. If air bag control module is dropped, it must be replaced.
  6. Turn ignition off and wait 2 minutes. Disconnect Air Bag Control Module (ACM). ACM is located under center console. 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 ACM. See AIR BAG CONTROL MODULE  under REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  7. Turn ignition off. Disconnect Sentry Key Immobilizer Module (SKIM). See Figure . 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 SKIM. See SENTRY KEY IMMOBILIZER MODULE  under REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  8. Ensure all previously disconnected modules are still disconnected. Turn ignition off. Disconnect scan tool from DLC. Using DVOM, measure resistance between ground and DLC connector terminal No. 3 (Violet/Brown wire). If resistance is 500 ohms or greater, go to next step. If resistance is less than 500 ohms, repair short to ground in Violet/Brown wire. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  9. Measure resistance between ground and DLC connector terminal No. 11 (White/Black wire). If resistance is 500 ohms or greater, go to next step. If resistance is less than 500 ohms, repair short to ground in White/Black wire. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  10. Try to use scan tool and communication cable on similar vehicle. If scan tool operates properly, replace instrument cluster. See appropriate INSTRUMENT PANELS article. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS. If scan tool does not operate properly, replace scan tool or communications cable. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
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