Your vehicle has an electronic keyless ignition with a pushbutton start.
(START): Press this button while your foot is on the brake for an automatic transmission, or while pressing in the clutch for a manual transmission, to start the engine. If your vehicle is in OFF or RAP mode, the keyless access transmitter must be inside the vehicle to start the engine.Notice: If you do not put a manual transmission in REVERSE (R) before exiting your vehicle, your vehicle will not be secured, the battery will drain and could be damaged. Always put a manual transmission in REVERSE (R) before shutting off the engine and exiting the vehicle.
When the engine is off, press this button to place the vehicle in accessory mode. ACCESSORY MODE ON will display on the Driver Information Center (DIC). This mode allows you to use things like the radio and the windshield wipers while the engine is off. Use accessory mode if you must have your vehicle in motion while the engine is off, for example, if your vehicle is being pushed or towed.
After being in accessory mode for about 20 minutes, the vehicle will automatically enter RAP or OFF, depending on if the doors are opened or closed.