RSQ3 Parking Assist Failure: Sensors vs Control Module

Had a similar issue with my SQ3 (2019, gasoline) last year. As someone with some hands-on experience working on cars, I first suspected individual ultrasonic sensors, but it turned out to be faulty wiring near the control module connector. The proximity sensors and rearview camera system stopped working suddenly, no warnings, no beeping, nothing. After checking fuses like you did, I took it to a workshop. They found damaged wiring where the main harness connects to the parking assist control module. Moisture had caused corrosion in one of the plug connections. The fix cost 95 Euro including diagnostic time and replacing the damaged connector. The obstacle detection system has worked flawlessly since then. Could you share your car year and if you notice any other electrical issues? Sometimes these problems can be related to other systems sharing the same wiring harness. Also, have you noticed if this happens more after rain or car washes? This could help pinpoint if water intrusion is the culprit in your case too. Worth checking if the ultrasonic sensors are physically damaged or extremely dirty first, this is something you can inspect yourself before spending money on diagnostics.

Had a similar issue with my SQ3 (2019, gasoline) last year. As someone with some hands-on experience working on cars, I first suspected individual ultrasonic sensors, but it turned out to be faulty wiring near the control module connector. The proximity sensors and rearview camera system stopped working suddenly, no warnings, no beeping, nothing. After checking fuses like you did, I took it to a workshop. They found damaged wiring where the main harness connects to the parking assist control module. Moisture had caused corrosion in one of the plug connections. The fix cost 95 Euro including diagnostic time and replacing the damaged connector. The obstacle detection system has worked flawlessly since then. Could you share your car year and if you notice any other electrical issues? Sometimes these problems can be related to other systems sharing the same wiring harness. Also, have you noticed if this happens more after rain or car washes? This could help pinpoint if water intrusion is the culprit in your case too. Worth checking if the ultrasonic sensors are physically damaged or extremely dirty first, this is something you can inspect yourself before spending money on diagnostics.

Thanks for sharing your experience. My 2014 RSQ3 (156799 KM) also has no warning indicators or beeping from the parking sensors. Had it serviced last month but they didnt spot this issue. After checking the ultrasonic sensors for visible damage or dirt buildup, they appear clean and intact. Interesting point about moisture, the problems did start after some heavy rain. The rearview camera still works fine though, so maybe the faulty wiring is specific to the parking assist module rather than the entire system. A 95 Euro repair would be manageable if its just connector corrosion like in your case. Will have the wiring checked first before considering sensor replacement.

Thanks for sharing your experience. My 2014 RSQ3 (156799 KM) also has no warning indicators or beeping from the parking sensors. Had it serviced last month but they didnt spot this issue. After checking the ultrasonic sensors for visible damage or dirt buildup, they appear clean and intact. Interesting point about moisture, the problems did start after some heavy rain. The rearview camera still works fine though, so maybe the faulty wiring is specific to the parking assist module rather than the entire system. A 95 Euro repair would be manageable if its just connector corrosion like in your case. Will have the wiring checked first before considering sensor replacement.

Thanks for the update on your RSQ3. The fact that your rearview camera still works while the proximity sensors are dead actually helps narrow down the issue. In my case, both systems failed because the corroded connection affected the entire parking assist control module. Given that your problems started after heavy rain and only the parking sensors are affected, I suspect water may have seeped into the connections specific to the ultrasonic sensors. The blind spot sensors might share the same circuit, so its worth checking if those still function normally. My repair was straightforward because the issue was contained to one connector. Your 2014 model might have slightly different routing of the sensor wiring compared to my 2019, but the basic layout is similar. The workshop should be able to test the continuity of the circuits leading to each parking sensor to identify any breaks or corrosion points. Since your car has higher mileage, they might recommend replacing the entire control module harness if multiple connection points show deterioration. This would cost more than my simple connector replacement, possibly around 250-350 Euro plus labor.

Thanks for the update on your RSQ3. The fact that your rearview camera still works while the proximity sensors are dead actually helps narrow down the issue. In my case, both systems failed because the corroded connection affected the entire parking assist control module. Given that your problems started after heavy rain and only the parking sensors are affected, I suspect water may have seeped into the connections specific to the ultrasonic sensors. The blind spot sensors might share the same circuit, so its worth checking if those still function normally. My repair was straightforward because the issue was contained to one connector. Your 2014 model might have slightly different routing of the sensor wiring compared to my 2019, but the basic layout is similar. The workshop should be able to test the continuity of the circuits leading to each parking sensor to identify any breaks or corrosion points. Since your car has higher mileage, they might recommend replacing the entire control module harness if multiple connection points show deterioration. This would cost more than my simple connector replacement, possibly around 250-350 Euro plus labor.

Thanks for the input. After getting my RSQ3 checked at the shop, they confirmed water damage in the wiring harness connecting to the parking assist control module. Multiple connection points were corroded, affecting all proximity sensors. The total repair came to 295 Euro, they had to replace a section of the wiring harness and clean the control module connections. The obstacle detection system now works perfectly again. All parking sensors are responding, with proper beeping and visual warnings when approaching objects. Lucky I caught this early before water could damage the actual control module or sensors. For anyone else facing similar issues, definitely check for moisture intrusion if your parking assist system fails suddenly, especially after rain. Getting it fixed promptly helped avoid more expensive repairs down the line. My rearview camera staying functional actually helped the techs isolate the problem to just the parking sensor circuits. The repair cost was higher than a simple connector replacement, but still reasonable considering the extent of corrosion they found.

Thanks for the input. After getting my RSQ3 checked at the shop, they confirmed water damage in the wiring harness connecting to the parking assist control module. Multiple connection points were corroded, affecting all proximity sensors. The total repair came to 295 Euro, they had to replace a section of the wiring harness and clean the control module connections. The obstacle detection system now works perfectly again. All parking sensors are responding, with proper beeping and visual warnings when approaching objects. Lucky I caught this early before water could damage the actual control module or sensors. For anyone else facing similar issues, definitely check for moisture intrusion if your parking assist system fails suddenly, especially after rain. Getting it fixed promptly helped avoid more expensive repairs down the line. My rearview camera staying functional actually helped the techs isolate the problem to just the parking sensor circuits. The repair cost was higher than a simple connector replacement, but still reasonable considering the extent of corrosion they found.