Circuit/System Description

The ignition main relay applies ignition voltage to the ignition circuit when the ignition is in the RUN or CRANK position. The ignition circuit supplies ignition voltage to the starter/generator control module. The ignition circuit also continues through the starter/generator control module in a pass-thru manner and continues to the battery energy control module. The battery energy control module also monitors the power mode message which is broadcast via serial data and compares the power mode message to the actual power mode as indicated by voltage on the ignition circuit.

Controlled by the body control module (BCM), the accessory wakeup circuit supplies voltage to the starter/generator control module as a means to wake the control module and initiate serial data communications. Like the ignition circuit, the accessory wakeup circuit continues through the starter/generator control module in a pass-thru manner and continues to the battery energy control module.