Battery voltage is supplied to the BCM at all times through the main fuse. The BCM provides and monitors a voltage signal to the ignition switch. This signal changes depending on the position of the IGN switch.

When the engine stop switch is in the RUN position, a CAN message is sent, signaling the BCM that the switch is in the RUN position. If CAN communication is interrupted while the engine is running, the BCM checks for the signal from the redundant engine stop switch circuit.

When the start switch is pressed, a CAN message is sent to the BCM.