PASS-Key II System Components

IGNITION KEY
The ignition key for vehicles equipped with the PASS-Key II system, consist of a typical square ignition key blank and a resistor pellet. The PASS-Key II ignition key has the same mechanical key cuts of a non PASS-Key II ignition key. The key blank and resistor pellet can not serviced separately. There are 15 different ignition key assemblies, each with a different key pellet resistance value.

STEERING COLUMN LOCK CYLINDER
The steering column lock cylinder used with the PASS-Key II system contains a set of electrical terminals used to contact the resistor in the ignition key. The wire routing for the contacts inside the steering column is very critical. When servicing the lock cylinder. be certain to maintain proper wire routing. When replacing a steering column lock cylinder, it will be necessary to make new keys which match the PASS-Key II key code of the PASS-Key II system and the mechanical cut of the new lock cylinder.

INSTRUMENT CLUSTER (IPC)
The IPC contains the software for controlling the PASS-Key II system. The IPC monitor the key-in-ignition input (CKT 80, LT GRN) and the ignition key resistor input (CKT1073, WHT/BLK). The IPC controls the starter enable output (CKT 625, YEL/BLK). The IPC also sends a fuel enable message to the PCM, via the class 2 serial data line.

Key-In-Ignition Input
The key-in-ignition input (CKT 80, LT ORN) is used to wake up the IPC, when a key is inserted into the steering column lock cylinder (ignition switch). When the IPC wakes up, the IPC measures the key pellet resistance value on the ignition key resistor input (CKT1073, WHT/BLK).

Ignition Key Resistor Input
The ignition key resistor input (CKT1073, WHT/BLK) is used by the IPC to measure the key pellet resistance.

Starter Enable Output
The starter enable output (CKT 625, YEL/BLK) is used by the IPC to control the starter enable relay.

STARTER ENABLE RELAY
The starter enable relay is controlled by the IPC, via the starter enable output (CKT 625, YEL/BLK). If the IPC measures the correct key pellet resistance value, the IPC switches the starter enable output (CKT 625, YEL/BLK) to ground. The relay is energized if the ignition switch is in the START position and the gear selector is in the PARK or NEUTRAL positions.

POWERTRAIN CONTROL MODULE (PCM)
The PCM monitors the class 2 serial data line for the fuel enable message from the IPC. If the fuel enable message is not present, the PCM does not enable the fuel system during engine crank. If the message is present, the PCM enables the fuel system, which allows the engine to start during engine crank.