System Operation: Start

To enter START mode, with a valid IA key inside the vehicle, press and hold the brake pedal, then press and release the start/stop switch. Once the BCM and RFA module indicate a valid Intelligent Access (IA) key is present inside the vehicle and the BCM has detected the start/stop switch input with the BPP input (automatic transmission) or CPP input (manual transmission), the BCM activates the ignition relay. The BCM also sends the ignition mode message to the other modules over the Medium Speed Controller Area Network (MS-CAN).

The engine can be started from any ignition mode. Once the ignition has entered START mode, the indicator in the start/stop switch illuminates.

When the BCM receives the ON voltage input from the ignition switch (also present in the START position), it activates the ignition relay, providing ignition power to various vehicle systems and modules. The PCM communicates the state of the engine by sending an "engine state" and "power pack status" message over the High Speed Controller Area Network (HS-CAN) to the BCM. While the engine is cranking, the BCM inhibits the accessory relay. The BCM communicates the state of the ignition to the other modules by sending an "ignition status" message over the Medium Speed Controller Area Network (MS-CAN).

The ignition switch START circuit is hardwired to the PCM. 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: STARTING SYSTEM - OVERVIEW .
• Refer to: STARTING SYSTEM - OVERVIEW .