For 1990-2009 cars

The Passlock sensor is powered by circuit 812. The Passlock sensor is grounded by circuit 1057. Passlock sensor data is supplied to the body control module (BCM) by circuit 1836.

The Passlock sensor data supplied to the BCM is in the form of V-codes or voltage codes. When the proper ignition key is turned in the ignition switch, the correct V-code is supplied to the BCM. The BCM responds by sending a serial data password to the engine controller allowing the engine to run.

### DTC Parameters

• | The ignition is in the OFF position.

• | Circuit 812 is shorted-to-battery voltage.

### Diagnostic Aids

• | Check for a poor connection at the BCM. Inspect the harness connectors for backed out terminals, improper terminal mating, broken connector locks, improperly formed or damaged terminals, and poor terminal-to-wire connection (terminal crimped over wire insulation and not conductors).

• | Inspect the wiring harness for damage. Check for broken or chaffed insulation.

• | Check for a poor connection at the Passlock sensor.

• | If a fault is suspected to be intermittent, wiggling the harness wiring may help in locating the fault.