Your vehicle has an electronic keyless ignition with pushbutton start.

(START): Press this button while your foot is on the brake to start the engine. The shifter must be in PARK (P) or NEUTRAL (N) to start the engine and the keyless access transmitter must be in the vehicle for the ignition to work.

ACC (OFF/ACCESSORY): When this button is pressed, the engine will turn off even if the shifter is not in PARK (P). If the shifter is in PARK (P), the ignition mode will change to Retained Accessory Power (RAP), if all doors are closed. The ignition mode will change to OFF, if a front door is opened. See Retained Accessory Power (RAP) for more information. If the shifter is not in PARK (P), the ignition mode will change to ACC (Accessory). See Shifting Into Park . 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 towed. If the door is open while in accessory mode, the key in reminder chime will sound continuously. If the push-button start is not working, your vehicle may be near a strong radio antenna signal causing interference to the keyless access system. See DIC Warnings and Messages for more information. After being in ACC for about 20 minutes, the vehicle will automatically enter RAP or will turn off, depending on if the doors are opened or closed.