Alarm Module: Description and Operation

SYSTEM OPERATION (BUICK)




The PASS-Key II Theft Deterrent system prevents vehicle theft by disabling the starter motor and fuel system. If the Body Control Module (BCM) does not identify the use of the correct ignition key to start the vehicle, the BCM will communicate a message to the Powertrain Control Module (PCM) which will disable the starter relay and fuel delivery to the engine.

When the BCM identifies the use of the correct ignition key (resistor pellet) to start the vehicle, the BCM will then send a "fuel enable" and "starter enable" message to the PCM which will allow the vehicle to start.

Important
If the wrong ignition key is used in an attempt to start the vehicle, a Data Trouble Code (DTC) will be set and the Body Control Module (BCM) will not send a "fuel enable" or "starter enable" message to the Powertrain Control Module (PCM) for three minutes even if the correct ignition key is used.