General Description

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 passlock TM lock cylinder. The passlock TM sensor will relay the passlock TM data to the passlock TM module. The passlock TM module will determine the validity of the passlock TM data. The passlock TM module will send a code password to the Vehicle/powertrain Control Module (VCM/PCM). When the VCM/PCM receives the correct code the VCM/PCM allows the fuel injectors to operate normally. The passlock TM system requires the VCM/PCM and the passlock TM module 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 Connector Description.