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DTC B2721, Pass-Key(R) Detection Circuit (Out Of Range): Testing

  1. If BCM diagnostic system check was performed, go to next step. If BCM diagnostic system check was not performed, go to BCM DIAGNOSTIC SYSTEM CHECK  .
  2. Try to start engine using each key provided with vehicle in ignition lock cylinder. Wait 3 minutes between each attempt to allow PASS-Key(R) II timer sequence to reset. If one of the keys works, go to step 6). If no keys work, go to next step.
  3. Using scan tool, check for DTCs B2722, B2723 or B2735. If any of these DTCs exist, go to appropriate DTC test. If none of these DTCs exist, go to next step.
  4. Perform lock cylinder and harness test. See appropriate ANTI-LOCK SYSTEM article. After test is complete, go to next step.
  5. Turn ignition off. Reinstall all components and connectors. Using scan tool, clear DTCs. Check for DTCs. If DTC B2721 sets again, go to next step. If DTC B2721 does not set again, system is operating properly.
  6. If all ignition keys started the engine, go to step 5). If any key did not start the engine, go to next step.
  7. Replace malfunctioning ignition key. Go to step 9).
  8. Turn ignition off. Replace BCM. See REMOVAL & INSTALLATION  . Reprogram BCM. See BCM PROGRAMMING. Go to next step.
  9. Turn ignition off. Reinstall all components and connectors. Turn ignition on. Using scan tool, clear DTCs. Perform BCM DIAGNOSTIC SYSTEM CHECK  .
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