Pass-Key(R) System Components

BCM
The PASS-Key(R) system is a subsystem of the BCM. The BCM provides all the logic necessary to operate the PASS-Key(R) system. The BCM uses direct input information from other systems or components to determine the status of the PASS-Key(R) system. The BCM controls its output functions based on PASS-Key(R) status.

PCM
The PASS-Key(R) fuel enable function is provided by the PCM. When the BCM detects a PASS-Key(R) resistance value, the BCM and PCM must exchange the correct password in order for the PCM to enable fuel.

IGNITION CYLINDER AND KEY
The ignition is used by the PASS-Key(R) system to determine if the correct key is being used to start the vehicle. When the ignition is first turned ON, the BCM measures the key resistance through the sensing contacts located in the ignition switch. Steering Column Lock.

The PASS-Key(R) system is able to provide steering column LOCK functions. The BCM provides output control allowing the BCM to LOCK or UNLOCK the steering column electronically based on PASS-Key(R) status.

THEFT DETERRENT RELAY
The PASS-Key(R) system can disable engine cranking through the theft deterrent relay. When the BCM detects the correct PASS-Key(R) resistance value, the BCM grounds the theft deterrent relay coil circuit, which allows the engine to be cranked