Body Control System Diagnosis

Schematic:

CIRCUIT DESCRIPTION
Battery voltage is supplied to the body control module (BCM) by circuit 2540. This input is internally monitored by the BCM for proper operating voltage. The proper operating voltage range is from 9 to 16 volts.

DTC PARAMETERS
^ Voltage on circuit 2540 is less than 9.0 volts
^ Ignition On, condition exists for 1.2 seconds before crank
^ Condition must exist for 2 seconds after crank
^ Illuminate telltale

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.

TEST

Diagnostic Chart: