One of the many features that comes with the 2010 Toyota 4Runner is Rear Parking Assist. To use this feature, press the button to the left of the steering wheel that is marked P. The system will beep and the green LED will be lit, confirming that the feature is turned on. When the car is put into reverse, the parking assist will start beeping. As the car gets closer to an object, the beeping will gradually get faster and faster. When the car becomes very close to an object, the beeping will become one continuous sound. This feature will help the driver approximate his distance from his surroundings when parking.