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Diagnostic Procedure

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  1. Connect scan tool. Turn ignition switch to RUN position, engine off. Using scan tool, check for BCM DTCs. If DTC B2948 is listed as a current DTC, go to next step. If B2948 is not listed as a current DTC, problem my be intermittent. See DIAGNOSTIC AIDS  .
  2. Disconnect Passlock(tm) sensor connector. Connect a DVOM between Passlock(tm) sensor connector terminal C2 and ground. See Figure . Set MIN/MAX mode to one millisecond peak and start record. Turn ignition switch to OFF position. Stop recording and review recorded MIN value. If voltage measures near zero volts, go to next step. If voltage does not measure near zero volts, go to step  5 .
  3. Check Red/White wire between Passlock(tm) sensor connector terminal C2 and BCM connector C1, terminal B3 for short to power. See WIRING DIAGRAMS  . Check for poor connections at connectors. If problem was found, go to step  6 . If problem was not found, go to next step.
  4. Replace BCM. See BODY CONTROL MODULE  under REMOVAL & INSTALLATION. After repairs, go to step  6 .
  5. Check Passlock(tm) sensor connector for poor connections. If connections are okay, replace Passlock(tm) sensor. See appropriate STEERING COLUMN SWITCHES article. Perform auto learn procedure. See PROGRAMMING  . After repairs, go to next step.
  6. Use scan tool to clear DTCs. Recheck BCM for DTCs. If DTCs do not reset, system is okay.
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