B2782

CIRCUIT DESCRIPTION
The instrument panel cluster (IPC) supplies a 5 volt signal and a ground circuit for the PASS-Key(R) system. This allows the IPC to detect PASS-Key(R) resistance values. Inserting the PASS-Key(R), with resistor pellet, in the ignition lock cylinder completes the PASS-Key(R) circuit. Contacts in the ignition lock cylinder mate with the pellet contacts. The IPC compares the resistance value of the key pellet to the valid resistance programmed into the IPC. If the proper resistance value is read, the IPC allows the engine to start. If the resistance value is incorrect, a malfunction is present and a DTC will set. If the IPC has been replaced, the new IPC needs to learn the ignition key code value. The IPC learns the first key code value when the ignition is first turned to ON.

CONDITIONS FOR SETTING THE DTC
The IPC does not have a valid key pellet resistance in the memory.

ACTION TAKEN WHEN THE DTC SETS
The IPC displays the PROGRAM PASSKEY message on the driver message center.

CONDITIONS FOR CLEARING THE DTC
The IPC learns the next valid key pellet resistance and stores the resistance in memory.

DIAGNOSTIC AIDS
^ If any other theft deterrent DTCs are also set current, diagnose that DTC first.
^ This DTC sets on replacement IPCs until the first valid key pellet is detected by the IPC.

TEST

Steps 1-5: