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Test 10A - Bus (+) & Bus (-) Shorted Together

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  . For appropriate wiring diagram, see WIRING DIAGRAMS  at end of article.
CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.
  1. Using DRB-II, indicate whether vehicle is equipped with specific module. Turn ignition off. Disconnect Transmission Control Module (TCM), if equipped. TCM is located on left side of engine compartment, near cowl.
  2. Turn ignition on. If DRB-II does not display BUS (+) & BUS (-) SHORTED TOGETHER, replace TCM. Perform VERIFICATION PROCEDURE VER-1.
  3. If DRB-II displays BUS (+) & BUS (-) SHORTED TOGETHER, turn ignition off and disconnect Powertrain Control Module (PCM). PCM is located between data link connector and battery, on fenderwell. Turn ignition on. If DRB-II does not display BUS (+) & BUS (-) SHORTED TOGETHER, replace PCM. Perform VERIFICATION PROCEDURE VER-1.
  4. If DRB-II displays BUS (+) & BUS (-) SHORTED TOGETHER, turn ignition off and disconnect traveler module, if equipped. Traveler module is located behind right side of dash, below glove box (AA body) or in bottom of center section of dash (AG and AJ bodies). Turn ignition on. If DRB-II does not display BUS (+) & BUS (-) SHORTED TOGETHER, replace traveler module. Perform VERIFICATION PROCEDURE VER-1.
  5. If DRB-II displays BUS (+) & BUS (-) SHORTED TOGETHER, turn ignition off and disconnect Mechanical Instrument Cluster (MIC) or Electronic Instrument Cluster (EIC). Turn ignition on. If DRB-II does not display BUS (+) & BUS (-) SHORTED TOGETHER, replace MIC or EIC. Perform VERIFICATION PROCEDURE VER-1.
  6. If DRB-II displays BUS (+) & BUS (-) SHORTED TOGETHER, turn ignition off and disconnect Vehicle Theft Alarm (VTA) module, if equipped. VTA module is located in back of glove box. Turn ignition on. If DRB-II does not display BUS (+) & BUS (-) SHORTED TOGETHER, replace VTA module. Perform VERIFICATION PROCEDURE VER-1.
  7. If DRB-II displays BUS (+) & BUS (-) SHORTED TOGETHER, turn ignition off and disconnect Electronic Vehicle Information Center (EVIC), if equipped. EVIC is located at center of roof, above visors. Turn ignition on. If DRB-II does not display BUS SHORT TO GROUND, replace EVIC. Perform VERIFICATION PROCEDURE VER-1.
  8. If DRB-II displays BUS (+) & BUS (-) SHORTED TOGETHER, turn ignition off and disconnect Engine Compartment Node (ECN), if equipped. ECN is located at top center of firewall. Turn ignition on. If DRB-II does not display BUS (+) & BUS (-) SHORTED TOGETHER, replace ECN. Perform VERIFICATION PROCEDURE VER-1.
  9. If DRB-II displays BUS (+) & BUS (-) SHORTED TOGETHER, turn ignition off and disconnect compass/temperature module, if equipped. Compass/temperature module is located at center of roof, above visors. Turn ignition on. If DRB-II does not display BUS (+) & BUS (-) SHORTED TOGETHER, replace compass/temperature module. Perform VERIFICATION PROCEDURE VER-1.
  10. If DRB-II displays BUS (+) & BUS (-) SHORTED TOGETHER, turn ignition off. Disconnect Air Suspension Control Module (ASCM), if equipped. ASCM is located in trunk on right side, above compressor relay. Turn ignition on. If DRB-II does not display BUS (+) & BUS (-) SHORTED TOGETHER, replace ASCM. Perform VERIFICATION PROCEDURE VER-1.
  11. If DRB-II displays BUS (+) & BUS (-) SHORTED TOGETHER, turn ignition off and disconnect Body Control Module (BCM), if equipped. BCM is located behind right kick panel. Turn ignition on. If DRB-II does not display BUS (+) & BUS (-) SHORTED TOGETHER, replace BCM. Perform VERIFICATION PROCEDURE VER-1. If DRB-II displays BUS (+) & BUS (-) SHORTED TOGETHER, disconnect DRB-II.
  12. Using an external ohmmeter, check resistance between CCD data link connector CCD bus positive circuit (Violet/Brown wire) and CCD bus negative circuit (White/Black wire).
  13. If resistance is less than 5 ohms, repair short between Violet/Brown and White/Black wires. Perform VERIFICATION PROCEDURE VER-1. If resistance is more than 5 ohms, replace DRB-II cable or cartridge as necessary. Perform VERIFICATION PROCEDURE VER-1.
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