Circuit/System Description

The body control module (BCM) controls the ignition main relay through the control circuit by applying voltage to the run/crank coil control circuit. The ignition circuit is energized when the vehicle power mode is Vehicle ON or Vehicle in Service Mode. The hybrid powertrain control module 2 sends the vehicle power mode status in a serial data message to the battery charger control module, A/C compressor, battery energy control module, fuel pump control module and the transmission control module (TCM).