Vehicle Theft Deterrent (VTD) Operation

Vehicle Theft Deterrent (VTD) Operation:

The design of the passlock(TM) system is to prevent the vehicle operation if the proper ignition key is not used in order to start the vehicle. The mechanical key, in normal operation, will turn the passlockTM lock cylinder. The passlock(TM) sensor will relay the passlock TM data to the Body Control Module (BCM). The BCM will determine the validity of the passlockTM data. The BCM will-send a code password to the Vehicle Control Module VCM. When the VCM receives the correct code the VCM allows the fuel injectors to operate normally. The passlockTM system requires the VCM and the BCM to communicate the various functions in order to operate. These functions transmit over the class 2 serial data line CKT 1807. For an explanation of the class 2 serial data operation refer to Data Link Communications Circuit Description in Data Link Communications