General Information

The Passlock(TM) system prevents vehicle operation if the proper ignition key does not attempt the start of the engine. The mechanical key, in normal operation, turns the Passlock(TM) lock cylinder. The Passlock(TM) sensor relays the Passlock(TM) data to the variable orifice (EVO) module. The Passlock(TM)/EVO module determines the validity of the Passlock(TM) data. Then the Passlock(TM)/EVO module sends a coded password to the vehicle control module (VCM). When the VCM receives the correct code, the VCM allows the normal operation of the fuel injectors.

Vehicle Control Module
The VCM is at the left rear side of the engine compartment, near the electronic brake control module.

The VCM communicates with the Passlock(TM) module through serial data over the Class 2 serial data bus, CKT 1807 (PPL). When the Passlock(TM) module determines a Pass Theft condition, the module sends a coded password to the VCM. Upon the receipt of the correct password, the VCM enables the fuel injection system and allows fuel delivery to the injectors. Note that the VCM may allow starting of the vehicle, but the vehicle then quickly stalls if the Passlock(TM) security system detects a condition. If the VCM does not receive a password, or if the password is incorrect at the time the engine starts, the VCM enters the Lockout Mode, in which the VCM does not allow starting of the vehicle. A tamper condition triggers the Lockout Mode. A tamper condition exists when the key used to start the vehicle is incorrect, and when a large magnet is present in the area of the lock cylinder, as in an attempted bypass of the Passlock(TM) system. A lack of data from the Passlock(TM) sensor to the Passlock(TM) module triggers certain DTCs which may also cause the Lockout Mode.