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DTC B2948: Security System Sensor Power Circuit High: Testing

  1. If theft deterrent system diagnostic system check has been performed, go to next step. If theft deterrent system diagnostic system check has not been performed, perform THEFT DETERRENT SYSTEM DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Connect scan tool to Data Link Connector (DLC). See Figure . DLC is located under left side of instrument panel. Turn ignition switch to ON position. Using scan tool, select BCM DISPLAY DTCS. If scan tool displays DTC B2948 as current, go to next step. If scan tool does not display DTC B2948 as current, go to DIAGNOSTIC AIDS  .
  3. Using scan tool, command Passlock(R) POWER OUTPUT CONTROL ON and OFF. If Passlock(R) power output control does not switch on and off, go to next step. If Passlock(R) power output control switches on and off, go to step  7 .
  4. Disconnect Black 3-pin Passlock(R) lock cylinder harness connector. Passlock(R) lock cylinder is located to right of instrument cluster on instrument panel. It may be necessary to remove instrument cluster for access to Passlock(R) lock cylinder harness connector. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Disconnect Pink 24-pin Body Control Module (BCM) harness connector C3. BCM is located under right side of instrument panel. See Figure . Check for short to voltage in White wire between Passlock(R) lock cylinder harness connector terminal "C" and BCM harness connector C3 terminal B4. See Figure and Figure . If a problem does not exist, go to next step. If a problem exists, repair as necessary. After repair, go to step  9 .
  5. Check BCM harness connectors for poor connections or damaged terminals. If a problem does not exist, go to next step. If a problem exists, repair as necessary. After repair, go to step  9 .
  6. Check Passlock(R) lock cylinder harness connector for poor connections or damaged terminals. If a problem does not exist, go to step  8 . If a problem exists, repair as necessary. After repair, go to step  9 .
  7. Replace and program BCM. See BODY CONTROL MODULE  under REMOVAL & INSTALLATION. After repair, go to step  9 .
  8. Replace Passlock(R) lock cylinder. See PASSLOCK(R) LOCK CYLINDER  under REMOVAL & INSTALLATION. Perform reprogramming procedure. See THEFT DETERRENT SYSTEM  under PROGRAMMING.
  9. Reconnect all disconnected components and connectors. Clear DTCs. Operate vehicle under conditions that set DTC. If DTC resets, go to step  3 . If DTC does not reset, system is okay.
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