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Test 7A - Bus Short To Battery

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), 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 BATTERY, replace TCM.
  2. If scan tool displays BUS SHORT TO BATTERY, turn ignition off and disconnect Powertrain Control Module (PCM). PCM is located under air cleaner.
  3. Turn ignition on. If scan tool does not display BUS SHORT TO BATTERY, go to TEST 7B  . If scan tool displays BUS SHORT TO BATTERY, 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. If scan tool does not display BUS SHORT TO BATTERY, go to TEST 7C  .
  4. If scan tool displays BUS SHORT TO BATTERY, disconnect traveler module connector, if equipped. Turn ignition on. If scan tool does not display BUS SHORT TO BATTERY, go to TEST 7D  .
  5. If scan tool displays BUS SHORT TO BATTERY, 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 BATTERY, go to TEST 7E  . If scan tool displays BUS SHORT TO BATTERY, turn ignition off and disconnect Vehicle Theft Security System (VTSS) module, if equipped. VTSS module is located at back of glove box.
  6. Turn ignition on. If scan tool does not display BUS SHORT TO BATTERY, replace VTSS module. If scan tool displays BUS SHORT TO BATTERY, disconnect compass/mini-trip module, if equipped. Compass/mini-trip module is located at center of roof above visors.
  7. Turn ignition on. If scan tool does not display BUS SHORT TO BATTERY, replace compass/mini-trip module. If scan tool displays BUS SHORT TO BATTERY, turn ignition off and disconnect Infinity CD player, if equipped.
  8. Turn ignition on. If scan tool does not display BUS SHORT TO BATTERY, replace CD player. If scan tool displays BUS SHORT TO BATTERY, turn ignition off and wait 2 minutes.
    CAUTION: Ensure ignition is off for 2 minutes before proceeding.
  9. 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 BATTERY, replace ABSCM.
  10. If scan tool displays BUS SHORT TO BATTERY, disconnect ATC head (A/C-heater control panel) connector, if equipped. Turn ignition on. If scan tool does not display BUS SHORT TO BATTERY, replace ATC head.
  11. If scan tool displays BUS SHORT TO BATTERY, turn ignition off and disconnect Overhead Traveler Information System (OTIS) module, if equipped. OTIS is located at center of roof above visors. Turn ignition on. If scan tool does not display BUS SHORT TO BATTERY, go to TEST 7H  .
  12. If scan tool displays BUS SHORT TO BATTERY, 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 BATTERY, go to TEST 7F  .
  13. If scan tool displays BUS SHORT TO BATTERY, disconnect scan tool from Data Link Connector (DLC). Using an external voltmeter, check voltage between chassis ground and DLC terminal No. 4. If voltage is more than 8 volts, repair short to voltage in Violet/Brown wire or Violet/Gray wire.
  14. If voltage is less than 8 volts, check voltage between chassis ground and DLC terminal No. 3 (White/Black wire). If voltage is more than 8 volts, repair short to voltage in White/Black wire. If voltage is less than 8 volts, replace scan tool cable or cartridge as necessary.
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