General Description

Circuit Chart:

CIRCUIT CHART
Circuit assignments for the Body Control Module (BCM) relating to device power:

DEVICE POWER
Battery voltage is supplied to the 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.

GROUNDING
Ground for the BCM is by circuit 550 through the left instrument panel junction block and right body ground splice pack/body ground.

POWER MODE
The 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. The BCM determines the state of the ignition switch for all modules on the serial data link.

ECU MALFUNCTION
The BCM performs an Electrically Erasable Programmable Read-Only Memory (EEPROM) checksum as a part of its internal diagnostics as the BCM is operating. When the EEPROM checksum does not equal a predetermined value, DTC B1000 - ECU Malfunction sets. The checksum is the contents of each memory location in EEPROM added together.

OPTION CONFIGURATION
The vehicle option content information must be entered as part of the BCM programming procedure. If the vehicle option content information is not included and programming procedure is completed, DTC B1000 - Option Configuration Error will set.