B1372

Diagnostic Chart:

Schematic:

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

DTC SET CONDITIONS
^ Ignition in 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

DIAGNOSTIC AIDS
^ Check for poor connection at the BCM. Inspect 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 wiring harness for damage. Check for broken or chaffed insulation.
^ If fault is suspected to be intermittent, wiggling harness wiring may help in locating fault.