How to Fix FCW System Failed in Honda Accord

Understanding FCW System in Honda Accord


FCW stands for Forward Collision Warning, a system designed to prevent collisions on the road. Honda Accord has implemented the FCW system to assist drivers in avoiding road mishaps. It works by detecting potential collisions, warning the driver, and applying the necessary brakes, if needed, to avoid an imminent collision.

The FCW system uses several sensors, such as camera and radar, to detect the distance and speed of the car in front, and the speed and direction of the vehicle itself. The system provides an alert if the car is approaching at a speed that could result in a collision. The warning message is displayed on the dashboard or head-up display, and a beep or vibrating sound is emitted to alert the driver. If the driver does not act, the FCW system can automatically apply the brakes, reducing the collision risk.

However, if the FCW system fails, it can cause inconveniences and put the driver at risk of collisions. Some common signs that indicate a failed FCW system are:

  • The FCW warning light or message appears on the dashboard
  • The beep sound or vibrating alert is not working
  • The brakes are not automatically applied when necessary
  • The distance or speed detection is inaccurate

If you notice any of these signs, you need to fix the FCW system as soon as possible to avoid accidents. Here are some steps that you can take to fix the FCW system failed Honda Accord:

Step 1: Check the FCW sensor

The FCW sensor may be the culprit if there is an issue with the FCW system. If the sensor is dirty, damaged, or blocked, it may not function properly or provide inaccurate results. You can check the sensor by examining it for dirt, debris, or damage and clean it if necessary. Make sure to follow the manufacturer’s instructions for cleaning the sensor to avoid causing further damage.

Step 2: Inspect the FCW system wiring

The FCW system wiring may also cause problems if it is damaged, disconnected, or corroded. You can examine the wiring by checking the FCW system’s manual or consulting a certified Honda technician. If you find any issues, you can repair or replace the wiring to fix the FCW system.

Step 3: Calibrate the FCW system

If you have recently replaced any FCW system components or had a repair, you may need to calibrate the system. Calibration involves adjusting the system’s settings to ensure that it functions correctly. You can calibrate the FCW system by following the manufacturer’s instructions or consulting a professional Honda technician. Calibrating the system is essential for accurate detection and to prevent false alarms.

Step 4: Visit a Honda dealership or a certified technician

If you are unable to fix the FCW system issues on your own, you should take your Honda Accord to a Honda dealership or a certified technician. They have the expertise and equipment to diagnose and fix the FCW system accurately. They can also ensure that the FCW system is compatible with other safety systems in your Honda Accord and is functioning correctly.


The FCW system in Honda Accord is a vital safety feature that can assist in avoiding collisions on the road. However, if the system fails, it can cause dangers to the driver and other road users. By following the steps mentioned above, you can fix the FCW system in your Honda Accord and ensure that it is working correctly, providing you with a safe and secure driving experience.

Possible Reasons for FCW System Failure

FCW System Failure Honda Accord

The FCW (Forward Collision Warning) system is an excellent safety feature in the Honda Accord that helps avoid accidents by alerting the driver when an impending collision occurs. However, like any other technology, the FCW system is prone to failure, causing it to stop working as expected. Here are some reasons why the FCW system in your Honda Accord might fail and what you can do to fix it.

1. Dirty Windshield

Dirty Windshield

The FCW system uses sensors mounted on the windshield to detect any objects in front of the vehicle. If the windshield is dirty or obstructed, these sensors may not function correctly, causing the FCW system to fail. Therefore, keeping the windshield clean is essential to ensuring the proper functioning of the FCW system. You can clean the windshield with a solution of water and mild detergent, followed by wiping it dry with a clean, soft cloth.

2. Faulty Sensors

FCW Sensor

The FCW system relies on a set of sensors mounted on both the front bumper and windshield to detect the distance between the vehicle and other objects. If these sensors are damaged or malfunctioning, the FCW system will not work correctly. Therefore, it is essential to ensure that the sensors are adequately maintained and replaced when necessary. It is advisable to take your Honda Accord to a certified Honda dealership for diagnosis and repair of faulty sensors.

3. Low Battery Voltage

Low Battery Voltage

The FCW system runs on electricity supplied by the vehicle’s battery. A low voltage battery may not deliver enough power to the FCW system, causing it to fail. So, if your FCW system is not functioning correctly, it is essential to check the battery voltage status to determine if that is the issue. You can use a voltmeter to measure the battery voltage. A healthy battery should give you a reading of around 12.6 volts.

4. ECM Malfunction

ECM Malfunction

The Electronic Control Module (ECM) is the brain of the vehicle’s engine management system and is responsible for controlling various vehicle functions, including the FCW system. If the ECM malfunctions, it can cause the FCW system to fail. Such a situation would require a certified Honda dealership technician to diagnose and repair the ECM.

5. Collision Mitigation Braking System Failure

Collision Mitigation Braking System Failure

The Collision Mitigation Braking System (CMBS) is a vital component of the FCW system responsible for applying brakes in emergency situations. If the CMBS fails, it can cause the FCW system to shutdown. The best way to fix this issue is by taking your Honda Accord to a certified dealership for repair.

In conclusion, the FCW system is an essential safety feature in the Honda Accord, and ensuring that it works correctly can help prevent accidents. There are several reasons why the FCW system may fail, including dirty windshield, faulty sensors, low battery voltage, ECM malfunction, and CMBS system failure. Understanding these reasons and taking appropriate measures to fix them will help ensure that your FCW system functions correctly.

Troubleshooting FCW System Issues

Troubleshooting FCW System Issues

If you are experiencing issues with your Honda Accord’s FCW (Forward Collision Warning) system, there are a few troubleshooting steps you can take before taking it to the dealer. In this section, we will discuss some common problems with the FCW system and how to fix them.

1. Clean the Windshield

One of the most common causes of FCW system failure is a dirty or obstructed windshield. Dirt, debris, and even stickers or decorations on the windshield can interfere with the camera’s ability to detect obstacles and trigger the warning system. Start by cleaning the windshield thoroughly with a soft cloth and a mild glass cleaner. Make sure there are no obstructions in front of the camera, such as air fresheners or toll booth passes. Additionally, make sure the camera is properly positioned and aligned. If cleaning does not resolve the issue, move on to the next step.

2. Check the Sensor and Calibration

The FCW system relies on a combination of a camera and a radar sensor to detect obstacles. Any damage to these components can cause the system to fail. Check for any visible damage to the camera or radar sensor, including cracks or scratches. If the components are damaged, they will need to be replaced to restore the system’s functionality. If there is no visible damage, it may be necessary to recalibrate the camera and radar sensor. Only a Honda dealer can perform this task, which involves using special equipment to adjust the camera and radar sensor positions and angles.

3. Check the FCW System Indicators

honda accord fcw system indicator

Another way to troubleshoot the FCW system is to check the FCW system indicators on the dashboard. If the FCW system has failed, you will see a warning message on the dashboard display, along with a yellow FCW icon. Additionally, the icon may turn green or flash green when the FCW system is working correctly. If you see a warning message or a yellow icon, refer to the owner’s manual for specific instructions on how to resolve the issue. In some cases, the FCW system may need to be reset by a Honda dealer.

It is also worth noting that the FCW system may not work in certain conditions, such as heavy rain, snow, or fog. In these situations, the FCW system may be temporarily disabled to prevent false warnings. Additionally, the system may not work if the vehicle is traveling below a certain speed, typically around 10 mph. These limitations are normal and designed to prevent false warnings.


The FCW system is a valuable safety feature that can help prevent accidents on the road. However, like any technology, it can fail or be affected by external factors. If you are experiencing issues with your Honda Accord’s FCW system, follow the troubleshooting steps outlined above. If these steps do not resolve the issue, take your vehicle to a Honda dealer for further diagnosis and repair.

Steps to Fix FCW System Failed in Honda Accord

Fix FCW System Failed in Honda Accord

If you own a Honda Accord, you might have noticed that the forward collision warning (FCW) system is one of its top safety features. This system is specifically designed to alert drivers of any imminent collision, giving them enough time to react and potentially avoid the accident altogether. However, if this system fails, it could be a cause for concern. In this article, we’ll take a look at how to fix FCW system failed in Honda Accord.

1. Check the FCW system sensors

Check the FCW system sensors

The first thing that you should do when you experience a malfunction with the FCW system is to check the sensors. Dirt and debris can accumulate on the sensors, which can impair their functionality. To clean them, use a soft cloth or a microfiber towel and a cleaning solution that doesn’t leave any residue. You can also use a compressed air can to blast off any dust or debris on them.

2. Inspect the FCW system’s wiring harness

Inspect the FCW system's wiring harness

The wiring harness is responsible for delivering power to the FCW system’s control unit. If there is any damage to the harness, it can prevent the system from functioning properly. Inspect the wiring harness for any physical damage such as cuts, fraying, or exposed wires. If you notice any issues, you should replace the wiring harness.

3. Reset the FCW system

Reset the FCW system

If cleaning the sensors and inspecting the wiring harness doesn’t fix the issue, you can try resetting the FCW system. To do this, you need to disconnect the battery and leave it disconnected for at least 5 minutes. Reconnect the battery and turn on the engine. Start driving and check if there are still any error messages or malfunctions. If the problem persists, then you might need to bring your car to a Honda dealership for further inspection.

4. Update the software

Update the software

If your Honda Accord is still within its warranty period, then a software update may be all that you need to fix the FCW system. You can bring your vehicle to an authorized Honda service center and have the software updated there. The service center will connect your vehicle to a diagnostic tool and check for any updates available for the FCW system. If there are any, they will update the software. Updating the software will not only fix the FCW system but also improve the overall performance of your vehicle.



The FCW system is an essential safety feature that every Honda Accord owner should take care of and maintain. Keeping the system clean, inspecting the wiring harness for any damage, resetting the system, and updating the software when necessary are important steps to ensure the system works properly. If you follow these steps, you shouldn’t have to worry about the FCW system failing in your Honda Accord and ensuring the safety of you and your passengers when driving.

Testing and Validating Fixed FCW System in Honda Accord

Honda Accord FCW

After fixing the FCW system in your Honda Accord, it is important to test and validate the system to ensure it is fully functional. Here are the steps to take:

1. Road Test

Honda Accord Road Test

The first step is to take the car on the road for a test drive to see if the system is working properly. During the road test, the system should detect objects in front of the vehicle and notify the driver with appropriate alerts. Make sure to drive in different conditions such as low light, sunshine, and rain, to fully test the system. The system should provide accurate alerts in all conditions.

2. Static Test

Honda Accord Static Test

In addition to the road test, it is important to perform a static test. This test involves positioning different objects in front of the vehicle, such as cones or cardboard boxes, and testing if the FCW system detects them. The system should provide an alert if an object is detected. If the system does not detect the object, there may still be an issue with the system that needs to be addressed.

3. Calibration Test

Honda Accord Calibration Test

To ensure the system is calibrated properly, take the car to a Honda dealership for calibration testing. Calibration ensures the system is functioning at optimal level and provides accurate alerts. The Honda dealership will have the necessary equipment to perform this test.

4. Maintenance Check

Honda Accord Maintenance Check

Regular maintenance checks can help ensure the FCW system is always functioning optimally. It is recommended to take the car for maintenance every 6 months or at least once a year. During the maintenance check, the FCW system can be checked for any issues, as well as ensure the system software is up-to-date.

5. Post-Crash Inspection

Honda Accord Post-Crash Inspection

In the event of an accident, it is essential to take the car for post-crash inspection. Even if the FCW system was not the cause of the accident, it is important to check the system for any damage. Post-crash inspection can reveal any damages to the FCW system and other critical systems.

Following these steps will help ensure the FCW system is always functioning optimally. If any issues are found during testing or maintenance checks, it is recommended to take the car to a Honda dealership for repairs. Safety should always be a top priority, and ensuring the FCW system is always functioning correctly can help prevent accidents and keep you and your passengers safe while driving.

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