How To Fix Acc/fcw Unavailable Service Required

How To Fix Acc/fcw Unavailable Service Required

Advanced Driver Assistance Systems (ADAS) have become an integral part of modern vehicles, providing improved safety and convenience for drivers. One of the key features in ADAS is the Adaptive Cruise Control (ACC) and Forward Collision Warning (FCW) systems. However, sometimes you may encounter a situation where the ACC/FCW becomes unavailable, and a service is required to fix the issue. In this article, we will guide you through some simple steps to resolve the ACC/FCW Unavailable Service Required problem effectively.

Check System Compatibility

Before jumping into troubleshooting steps, it is essential to ensure that your vehicle’s make, model, and year is compatible with ACC/FCW technology. Different vehicles may have different ADAS capabilities, and older models might not have these features at all. Consult your vehicle’s user manual or contact the manufacturer to confirm if your vehicle is equipped with ACC/FCW.

Reset the System

If you have made sure that your vehicle is compatible with ACC/FCW but still experiencing the “ACC/FCW Unavailable Service Required” message on your vehicle’s display panel, the first step is to reset the system. To perform a system reset:

  1. Turn off your vehicle’s engine and remove the key from the ignition. Make sure the vehicle is in park mode and engage the parking brake.
  2. Wait for a few minutes to ensure the system has fully powered down.
  3. Re-insert the key into the ignition and start the vehicle.
  4. Check the ACC/FCW status on the display panel to see if the issue has been resolved.

Inspect Sensors and Cameras

If a system reset did not fix the problem, it is time to inspect the sensors and cameras. The ACC/FCW systems rely on various sensors and cameras to operate effectively. Ensure that they are clean, free from obstructions, and undamaged. Inspect the following elements:

  • Radar Sensor: Typically located in the front grille or behind a bumper cover. Remove any dirt, debris, or ice that may be covering the sensor, as this can obstruct its functionality.
  • Camera: Clean the front-facing camera lens using a soft, lint-free cloth. Be careful not to scratch the lens surface.
  • Ultrasonic Sensors: These are usually mounted in the front and rear bumpers. Clean them with a mild detergent and a soft cloth to remove any dirt or grime buildup.

After cleaning and inspecting the sensors and cameras, recheck the ACC/FCW status to see if the issue has been resolved. If the problem persists, move on to the next step.

Check for Faulty Fuses

If the ACC/FCW system continues to display the “Unavailable Service Required” message, it is worth checking the fuses that relate to these systems. Faulty fuses can cause a disruption in power supply and communication between the ADAS components. Follow these steps to check for faulty fuses:

  1. Refer to your vehicle’s user manual to locate the fuse box.
  2. Using the appropriate fuse diagram for your vehicle, identify the fuses related to the ACC/FCW.
  3. Inspect the identified fuses to see if they are blown. A blown fuse can be identified by a broken wire inside or blackened appearance.
  4. If any of the identified fuses are blown, replace them with fuses of the same amperage rating.

Once you have replaced any faulty fuses, check if the ACC/FCW is working properly. If the issue remains, it may require further diagnosis and servicing by a qualified technician.

Consult a Professional

If all the above steps have been followed diligently and the “ACC/FCW Unavailable Service Required” issue persists, it is recommended to seek assistance from a professional automotive technician. They will have the necessary expertise, diagnostic tools, and resources to diagnose and repair the problem accurately.


Adaptive Cruise Control and Forward Collision Warning systems provide essential safety features for drivers, but encountering an “ACC/FCW Unavailable Service Required” message can be frustrating. By following the simple steps outlined in this article, you can attempt to resolve the issue on your own. However, if the problem persists, it is always best to consult a professional technician who can provide the necessary expertise and support to ensure the proper functioning of these vital ADAS components in your vehicle.

Leave a Comment