What causes the parking assist system in Mercedes-Benz E300L to stop working?
2 Answers
Reasons for the parking assist system in Mercedes-Benz to stop working: damaged sensors or bumper; sensors being blocked by components installed on the vehicle, such as bumper covers. Use of a temporary spare tire; the vehicle being used to transport loads exceeding its capacity. How the parking assist system works: It includes ultrasonic sensors embedded in the front and rear bumpers, each with a diameter of approximately 15mm. The ultrasonic detection signals emitted by the sensors reflect when they encounter obstacles. The sensors then receive the reflected signals and promptly feed them back to the system for distance calculation. The system alerts the driver to the distance between the vehicle and obstacles outside the field of vision through sound, video, etc. Symptoms of parking assist system failure: After receiving the vehicle, a test drive was conducted to verify the fault. When the ignition switch was turned on to start the engine and the transmission was shifted into R gear, it was found that the red indicator light on the parking assist system (PTS) button was illuminated, and neither the front nor rear parking warning indicators responded, indicating that the parking assist system was in a deactivated state.
When I was driving my Mercedes-Benz E300L, the parking assist system suddenly malfunctioned, and an error warning light appeared on the dashboard. This often happens because the sensors are covered with mud or dust, or the camera is dirty and cannot detect obstacles. Alternatively, water from car washing may have entered the sensors, causing a short circuit. Additionally, the vehicle software might need an update—I previously resolved the issue after updating the infotainment system. If these possibilities are ruled out, it could be due to loose wiring connections or a faulty control module, especially after driving on bumpy roads or opening the trunk. The system failure made reversing dangerous, and I nearly scraped a wall, so I immediately took it to the dealership for inspection. They diagnosed and fixed the issue using a computer, avoiding major repairs. For daily maintenance, it’s advisable to clean the sensor area after rain or long trips and never ignore warning lights.
