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System Check

  1. Turn ignition switch to RUN position. If SECURITY light illuminates for 3 seconds, then turns off, go to step 4). If SECURITY light does not illuminate for 3 seconds, then turn off, go to next step.
  2. If SECURITY light flashes, go to step 15). If light is not flashing, go to next step.
  3. Turn ignition switch to START position. If engine starts, go to step 15). If engine does not start, go to SYSTEM TEST  .
  4. Turn ignition switch to START position. If engine starts, go to next step. If engine does not start, go to step 8).
  5. If SECURITY light is on, or customer reports light is on during normal driving conditions, go to next step. If light is not illuminated while engine is running, system is normal.
  6. Using a scan tool, attempt to communicate with vehicle. If communication exists, go to next step. If communication does not exist, go to step 17).
  7. Check for current PASSLOCK(R) or powertrain DTCs. If any DTCs exist, diagnose and repair problem. For powertrain DTCs, see appropriate TESTS W/CODES article in ENGINE PERFORMANCE section:

    For PASSLOCK(R) DTCs, see DIAGNOSTIC TESTS  . If no DTCs exist, diagnose and repair instrument cluster. See INSTRUMENT PANEL article.

  8. If SECURITY indicator is off, go to next step. If SECURITY indicator is illuminated, go to step 12).
  9. If engine cranked normally, go to next step. If engine did not crank normally, go to step 11).
  10. Check fuel delivery. See BASIC TESTING article in ENGINE PERFORMANCE section.
  11. Check starting system. See STARTER article in ELECTRICAL.
  12. If SECURITY indicator is on steady, go to next step. If SECURITY indicator is not on steady, go to step 15).
  13. Check for current PASSLOCK(R) DTCs. If no DTCs exist go to next step. If any DTCs exist, go to applicable test under DIAGNOSTIC TESTS  .
  14. Diagnose and repair instrument cluster. See INSTRUMENT PANEL article. After repair, go to step 18).
  15. Check for current PASSLOCK(R) or powertrain DTCs. If any DTCs exist, diagnose and repair problem. For powertrain DTCs, see appropriate TESTS W/CODES article in ENGINE PERFORMANCE section:

    For PASSLOCK(R) DTCs, see DIAGNOSTIC TESTS  . If no DTCs exist, diagnose and repair instrument cluster. See INSTRUMENT PANEL article.

  16. Using scan tool, check for current PASSLOCK(R) DTCs in TBC. If communication does not exist, go to next step. If any DTCs exist, go to applicable test under DIAGNOSTIC TESTS  .
  17. Repair Class 2 serial data line communications. See WIRING DIAGRAMS  . Go to next step.
  18. Clear DTCs. Go to SYSTEM TEST.
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