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Diagnostic Procedure

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  1. Connect scan tool. Momentarily rotate ignition switch to START position (do not start engine). Release ignition switch to ON position. With scan tool, observe Passlock(tm) data voltage in BCM security data list. If voltage is not 0.4-4.9 volts, go to next step. If voltage is within 0.4-4.9 volts, problem is intermittent. See DIAGNOSTIC AIDS  .
  2. Turn ignition switch to OFF position. Disconnect Passlock(tm) sensor connector. Turn ignition switch to RUN position, engine off. With scan tool, observe Passlock(tm) data voltage in BCM security data list. If voltage is greater than 4.9 volts, go to next step. If voltage is not greater than 4.9 volts, check connectors at BCM for poor connections. If connections are okay, replace BCM. See BODY CONTROL MODULE  under REMOVAL & INSTALLATION. After repairs, go to step  9 .
  3. Turn ignition OFF. Connect a 3-amp fused jumper wire between Passlock(tm) sensor connector terminal D3 (Yellow wire) and terminal C4 (Orange/Black wire). See Figure . Turn ignition switch to RUN position, engine off. Using scan tool, observe Passlock(tm) data voltage in BCM security data list. If voltage is less than 0.4 volt, go to next step. If voltage is more than 0.4 volt, go to step  6 .
  4. Disconnect fused jumper wire. Using a DVOM, measure voltage between Passlock(tm) sensor connector terminal C2 (Red/White wire) and terminal C4 (Orange/Black wire). See Figure . If voltage is less than 12 volts, go to next step. If voltage is not less than 12 volts, go to step  8 .
  5. Check Red/White wire between Passlock(tm) connector terminal C2 and BCM connector C1, terminal B3 for open or poor connections. See WIRING DIAGRAMS  . If wire and connections are okay, replace BCM. See BODY CONTROL MODULE  under REMOVAL & INSTALLATION. After repairs, go to step  9 .
  6. Check Yellow wire between Passlock(tm) connector terminal D3 and BCM connector C2, terminal B3 for short to voltage, high resistance or open. See WIRING DIAGRAMS  . If wire and connections are okay, go to next step. If problem is found, repair as necessary. After repairs, go to step  9 .
  7. Check Orange/Black wire between Passlock(tm) connector terminal C4 and BCM connector C2, terminal A2 for high resistance, open or poor connections. See WIRING DIAGRAMS  . If wire and connections are okay, replace BCM. See BODY CONTROL MODULE  under REMOVAL & INSTALLATION. If problem is found, repair as necessary. After repairs, go to step  9 .
  8. 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.
  9. Use scan tool to clear DTCs. Turn ignition switch to OFF position. Momentarily turn ignition switch to START position (do not start engine). Release key to RUN position. Using scan tool, check BCM for DTCs. If DTCs do not reset, attempt to start engine. If engine starts and runs, system is okay.
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