Conventional Ignition Switch System: Start

When the ignition switch is in the START position, the switch routes voltage through the ON-designated circuitry to the BCM  and a separate circuit to the PCM  to start the vehicle. The circuit designated for the START mode is only used for vehicle starting.

While the engine is cranking, the BCM  inhibits the accessory delay relay. After the vehicle starts, the BCM  activates the accessory delay relay.

The PCM  uses the ignition switch START input to determine when to activate the starter motor relay. For information on the starting system, Refer to the appropriate Engine Cooling article for the procedure.