For 1990-2009 cars

### Circuit Description

The body control module (BCM) monitors the ignition 1 voltage circuit 339, the ignition 2 voltage circuit 743 and the engine run flag (ERF). The ERF is a serial data message from the engine controller.

### Conditions for Setting the DTC

• | Ignition in the RUN position

• | Ignition 1 circuit 339 shorted-to-ground or open

• | Engine run flag present (engine running)

• | All conditions for greater than 1.2 seconds

• | No telltale illumination

### 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 the conductors).

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

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