Passlock(R) Theft Deterrent

The Body Control Module (BCM) contains the logic for Passlock(R) theft deterrent system. BCM provides battery positive voltage to operate Passlock(R) sensor. BCM also measures voltage of security sensor signal circuit. Voltage measured will indicate whether Passlock(R) sensor has been activated and whether resistance value from sensor is a valid value or tamper value. If voltage measured is in valid range, BCM compares this voltage code to a previously learned voltage code. If voltage codes match, BCM sends a class 2 message containing a password to Powertrain Control Module (PCM). If voltage codes do not match, or voltage is in tamper range, or there is a circuit fault, BCM will not send correct password to PCM, and vehicle will not start. For additional information on Passlock(R) theft deterrent system, see appropriate ANTI-THEFT SYSTEMS article.