Network Message Chart - Push Button Start: 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.