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Why is the Mercedes reversing radar not alerting?

2 Answers

HarrisonDella

07/30/25 2:04am

The reasons why the Mercedes reversing radar is not working include damage to the reversing light switch, failure of the signal to reach the radar main unit, wiring issues, or faulty sensors. Below are the detailed reasons for the malfunctioning of the Mercedes reversing radar: Damage to the reversing light switch: This can cause the reversing radar to stop working (most reversing radars operate in conjunction with the reversing light switch. Engaging reverse gear activates the reversing light switch, supplying power to both the reversing lights and the reversing radar simultaneously). Reversing light signal not reaching the radar main unit: Check if the reversing lights are functioning properly and if the wiring is intact. Wiring issues: There may be problems with the wiring between the reversing radar controller and the sensors. Faulty sensors: The reversing radar controller or the sensors themselves may be defective.

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LaDeclan

08/15/25 8:03am

As a long-term Mercedes-Benz owner, I've encountered situations where the parking sensors didn't alert me. The most likely cause is when the sensors on the rear bumper get covered by mud, dust, or snow, especially after driving in rain or off-road conditions. Cleaning the sensors is simple - just gently wipe the surface with a soft cloth. If cleaning doesn't work, the sensor itself might be damaged and need replacement. A blown fuse is another common issue - open the fuse box in the engine compartment, find the fuse related to the parking sensors, and try replacing it with a spare one to test. Additionally, loose or corroded wiring connections, control module failure, or even accidentally turning off the function in the settings menu could cause malfunctions. I recommend first trying self-inspection, cleaning, and fuse replacement. If that doesn't work, don't push your luck - get it repaired at a professional shop as soon as possible. Driving without parking sensor alerts is dangerous and can easily lead to scrapes or accidents, so don't delay repairs. Regular cleaning of the sensors during car washes can prevent most issues.

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