Ignition Switch Lock Cylinder: Description and Operation

IGNITION LOCK CYLINDER AND HOUSING

The Passlock sensor and ignition lock cylinder are one assembly. The Passlock sensor is separate from the key and lock cylinder. The key and the lock cylinder work together in order to determine if the proper ignition key was used to start the vehicle. In the event of an open Class 2 serial data line between the BCM and the PCM, the vehicle will become fail-enabled if the PCM has already received the password from the BCM for that ignition cycle (the engine is running). In this event, the following conditions occur:
- The SECURITY indicator will be ON continuously.
- The PCM will become fail-enabled for future ignition cycles.

If a failure in the Class 2 serial data line occurs before the ignition cycle, when the PCM is not fail-enabled, the following conditions occur:
- The PCM will never receive a valid password in order to enable the fuel injectors and crank relay.
- The vehicle will not start.