Every Isuzu MU-X has a network of safety features that protect you and others. For example, Isuzu’s Intelligent Driver Assistance System(IDAS) technology is standard across every MU-X model. It uses front and reverse sensors and multiple cameras to constantly monitor your surrounding environment and objects that may not be in the driver’s line of sight.
But like other system components, the reverse sensors may malfunction or display error codes on the infotainment screen. The reverse sensors may stop working if they are obstructed by dirt, snow, mud, or oils. The sensors can also freeze or have an electrical fault.
In addition, the reverse sensors sometimes send an error code due to faulty wires, decoupling rings, or damage from water infiltration.
This article will help you understand why your Isuzu MU-X reverse sensors are not working and provide troubleshooting tips.
How do Isuzu MU-X parking sensors work?
The Isuzu MU-X reverse or backup sensors use ultrasonic waves to detect obstructions around the vehicle while backing up or during parallel parking.
When you put your car in reverse with the controller, the parking sensors emit ultrasonic waves to calculate the approximate distance between your car and an obstacle. Then the system notifies the driver using beep sounds in the cabin, and in some models, the reverse camera will give a visual display on the screen to let you see how close you are to objects.
As the vehicle moves close to an object, the sound gets louder or more frequent until it becomes solid. Unfortunately, ultrasonic sensors have several flaws. For instance, they cannot detect objects too close to the ground, narrow objects, or objects on the side.
Reasons why Isuzu MU-X sensors are not working
If you drive in reverse and the reverse parking sensor are not beeping or beeping abnormally, they are faulty. Here are some reasons why your Isuzu MU-X reverse sensors are not working and how you can troubleshoot them.
Covered in dirt or snow
The backup sensors in all vehicles are on the lower back part of your car. Therefore, dust, mud, snow, and oils will accumulate over them, preventing them from working properly. Thankfully, the backup sensors are easy to clean.
You’ll need a clean microfibre cloth, warm water, and car shampoo. First, clean the sensors gently to avoid scratching them, then rinse them and wipe them dry with a clean cloth or soft paper towel. If the sensors are clean and a message appears on the vehicle’s display, such as “ service park assist” or “park assist blocked, ” you can try resetting the reverse sensors.
Here’s a general guide to resetting the reverse sensors, but you can check your user manual for more specific instructions:
- If your car is on, turn it off and then on again without starting your car.
- Press the parking button 10 times
- Turn the ignition off.
- Press the parking button for about 10 seconds, and you may hear a long beeping sound to indicate a successful reset.
- Turn on the car and see if the reverse sensors work. If it doesn’t, there may be an electrical issue.
Faulty decoupling ring
The decoupling ring could be faulty if the reverse sensors are clean but won’t work. The decoupling retainer ring seals the sensor against water entering and for proper positioning in the cut-out on the vehicle’s body. If the decoupling ring deviates from the position of the sensors, they won’t detect obstructions.
If the decoupling ring is loose, the reverse sensor will make unnecessary noise. You can easily disassemble and replace the ring properly, ensuring the sensor fits snugly. If the decoupling ring looks damaged or worn, you’ll have to replace it.
Wiring issues
Loose wires, disconnection, or damaged wires in the reverse sensor system will prevent it from functioning effectively. This may cause the sensors to behave erratically or to stop working completely.
To test the parking sensor wiring:
- First, disconnect the negative battery terminal.
- Next, find the sensor wiring harness on the back bumper.
- Use a multimeter to test the wire for continuity.
- The wires are damaged and need replacing if there is no current.
- If there is continuity, replace the negative battery terminal and test the system.
Faulty reverse sensors
If the sensors are clean and the wiring is in good condition, you need to check if the sensors are faulty. Over time, your Isuzu MU-X parking sensors will wear out due to exposure to the elements. Also, if the parking sensors are not working after a bump, they are likely physically damaged and will need a replacement.
To test their functionality, put your car stationary and in reverse. Then have a friend stand at the back and walk slowly toward your Isuzu MU-X. Ideally, you will hear the beep getting faster and become a solid sound.
If the sensors are faulty, have your friend place their ear to the sensor while the vehicle is still in reverse but stationary. There should be a buzzing sound coming from the sensor. If there is a buzz from the sensor, but it’s not working, it means there’s another issue in the system. In this case, you’ll need a professional mechanic to diagnose and fix the issue.
If there is no buzz, your sensor needs replacing. Unfortunately, replacement parking sensors can be quite expensive. But you can save some money by replacing the reverse parking sensors yourself with the help of a few basic tools.
Error code notifications
The reverse sensor itself could work perfectly in some cases, but it throws an error code. So again, you’ll need to check with the owner’s manual specific to your MU-X model.
You’ll need to connect an ODBII scanner to your car to find the error code. Your mechanic will then know how to fix the issue. This could be replacing a component of the system or the entire reverse sensor unit.
Moisture damage
Reverse sensors are quite sensitive to water. If there is even little water inside the reverse sensors system, it can prevent the sensors from working. Since water is an excellent conductor of electricity, therefore it can cause a malfunction. Water damage is usually irreparable. Therefore you may have to replace the sensors.
Conclusion
Your Isuzu MU-X parking sensors may malfunction due to obstruction by dirt or snow, faulty wiring, a bad decoupling ring, or a bad sensor. If the sensors are clean and their wiring is okay, the parking sensor may need a replacement. We hope our article will help you diagnose and troubleshoot the issue. If not, you’ll have to take your car to a professional mechanic.