Learn how to use the parking assist mode in the new 2010 Toyota Prius in simple steps. Press the Intelligent parking assist button located under the power button when you park you car. Now select the type of parking you want to park your car which is either parallel parking or back in mode. For the parallel parking stay 3 feet away from the vehicle to your right and stop when you hear a beep. Press OK when ready, release the steering and gently control the speed as the system will steer for you. Now for the back in mode do the same and follow the instructions provided by the system. Remember you have to control the speed and brakes when the system steers for you.