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Test 8A - Bus Short To 5 Volts

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  . For wiring diagrams, see appropriate article in ENGINE PERFORMANCE:
  1. Using scan tool, indicate whether vehicle is equipped with specific module. See MODULE APPLICATIONS  table. Turn ignition off. Disconnect Transmission Control Module (TCM) connector, if equipped. TCM is located on left side of engine compartment near cowl. Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, replace TCM.
  2. If scan tool displays BUS SHORT TO 5 VOLTS, turn ignition off and disconnect Powertrain Control Module (PCM) connector. PCM is located under air cleaner.
  3. Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, go to TEST 8B. If scan tool displays BUS SHORT TO 5 VOLTS, turn ignition off and disconnect Controller Anti-Lock Brake (CAB), if equipped. CAB is located on left fenderwell of engine compartment, behind anti-lock brake pump motor.
  4. Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, replace CAB. If scan tool displays BUS SHORT TO 5 VOLTS, turn ignition off and disconnect traveler module, if equipped. Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, go to TEST 8D  .
  5. If scan tool displays BUS SHORT TO 5 VOLTS, turn ignition off and disconnect Mechanical Instrument Cluster (MIC) or Electronic Instrument Cluster (EIC). Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, go to TEST 8E  .
  6. If scan tool displays BUS SHORT TO 5 VOLTS, turn ignition off. Disconnect Vehicle Theft Security System (VTSS) module, if equipped. VTSS module is located in back of glove box. Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, replace VTSS module.
  7. If scan tool displays BUS SHORT TO 5 VOLTS, turn ignition off and disconnect compass/mini-trip module, if equipped. Compass/mini-trip module is located at center of roof, above visors.
  8. Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, replace compass/mini-trip module. If scan tool displays BUS SHORT TO 5 VOLTS, turn ignition off and disconnect Overhead Traveler Information System (OTIS) module, if equipped. OTIS is located at center of roof, above visors.
  9. Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, replace OTIS. If scan tool displays BUS SHORT TO 5 VOLTS, turn ignition off and disconnect Infinity CD player, if equipped. Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, replace CD player. If scan tool displays BUS SHORT TO 5 VOLTS, disconnect ATC head (A/C-heater control panel) connector, if equipped.
  10. Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, go to TEST 8F  . If scan tool displays BUS SHORT TO 5 VOLTS, turn ignition off and wait 5 minutes.
    CAUTION: Ensure ignition is off for 5 minutes before proceeding.
  11. Disconnect Air Bag System Control Module (ABSCM). ABSCM is located under center of instrument panel. Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, replace ABSCM.
  12. If scan tool displays BUS SHORT TO 5 VOLTS, turn ignition off and disconnect Body Control Module (BCM), if equipped. BCM is located behind right kick panel. Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, go to TEST 8G  .
  13. If scan tool displays BUS SHORT TO 5 VOLTS, disconnect scan tool from Data Link Connector (DLC). Using an external voltmeter, check voltage between chassis ground and DLC terminal No. 4 (Violet/Brown wire). If voltage is more than 4 volts, repair short to voltage in Violet/Brown wire.
  14. If voltage is less than 4 volts, check voltage between chassis ground and DLC connector terminal No. 3 on (White/Black wire). If voltage is more than 4 volts, repair short to voltage in White/Black wire. If voltage is less than 4 volts, replace scan tool cable or cartridge as necessary.
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