For 1990-2009 cars

### Circuit Description

The 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.

### Conditions for Setting

• | The ignition is in RUN, START or ACC.

• | The Passlock™ data equals the stored tamper V-code for 1 second.

• | The telltale will illuminate.

• | The security telltale will illuminate.

### 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 -- the terminal is crimped over the wire insulation and not the conductors.

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

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