How to use Adaptive Cruise Control on Toyota Prius 4th generation

Full Speed Dynamic Radar Cruise Control supplements conventional cruise control with vehicle-to-vehicle distance control.

Toyota Prius, fourth generation XW50 – (photo by Toyota)

It allows the vehicle to automatically accelerate or decelerate in order to help maintain a set following distance from a vehicle traveling directly ahead.


  1. To turn the system on, press the on-off button on the cruise control stalk on the steering wheel. The radar cruise control indicator will illuminate, and a message will appear in the MID.
  2. Accelerate to your desired speed of 30 miles per hour or more and push the stalk down to set the speed. When you do, the set indicator will appear in the multi-information display.
  3. If you need to increase your set speed, push the stalk up and quickly release it for a small increase in speed. Holding the stalk up will accelerate continuously to a desired speed. Release the stalk and the speed will set.
  4. To reduce the set speed, push down and quickly release it for a small decrease in speed. Holding the stalk down will decelerate continuously. Release the stalk at your desired speed and the speed will set.

When a vehicle in front of you is detected to be moving slightly slower, your vehicle will slow down, illuminate the brake lights and help you maintain a set distance. If the system cannot decelerate sufficiently to prevent your vehicle from closing in on the vehicle ahead, a warning tone sounds to notify you.

Adjusting gap: Pressing the vehicle-to-vehicle distance button on the steering wheel repeatedly cycles through the three distances available: long, medium or short.

When traveling above 25 miles per hour and there are no longer any vehicles directly ahead of you driving slower than the set speed, the system will accelerate until the set speed is reached.

How to Cancel: To cancel a set speed, press on the brake pedal or pull the stalk towards you.

How to resume after stopping: While using Full Speed Dynamic Radar Cruise Control, when the vehicle traveling directly ahead of you stops, the system is designed to also stop your vehicle. After the vehicle ahead of you starts off, pushing the cruise control stalk up or tapping the accelerator will resume follow up cruising.

System disables itself below 25 miles an hour: If the vehicle ahead of you turns out of the lane and your vehicle is traveling at a speed below about 25 miles per hour, cruise control will be canceled. To resume, accelerate to 30 miles per hour or more and push the stalk up.


Using conventional Cruise Control

Your vehicle can also be switched to operate using conventional Constant Speed Cruise Control.

  1. With the system off, press and hold the on-off button approximately two seconds to activate the system.
  2. The dynamic radar cruise control indicator will appear and then switch to the cruise control indicator.
  3. Press the stalk down to set the speed.
  4. To switch back to vehicle-to-vehicle distance control, turn the cruise control off by pressing the on-off button, wait a second and press it again to turn the system on.
  5. When the vehicle is shut off and started again, the system will default to the Full Speed Dynamic Radar Cruise Control system.
Contact the author: gusedgar@wheelsjoint.com



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