Viano Parking Aid Fault Troubleshooting

I had a similar problem with the parking sensors on my old BMW 5 series. The symptoms sound familiar – complete failure and an error code. In my case, it was faulty wiring to one of the ultrasonic sensors. Have you checked the wiring harness that connects the sensors to the control module? Sometimes corrosion or a loose connection there can cause the entire system to fail. Also, consider checking the voltage at the control module itself to rule out a power supply issue. Do you have access to a wiring diagram for your Viano's parking aid system?

Thanks for the input regarding the BMW. I don't currently have a wiring diagram, but I can probably source one. When you mention checking the voltage at the control module, what specific voltage levels should I be looking for? Also, where is the control module physically located in the vehicle? Any tips on accessing it without causing further damage?

On my BMW, the control module was located in the trunk, behind the trim panel on the driver's side. I'm not certain about the Viano, but it's likely in a similar location – either the trunk or under one of the seats. As for the voltage levels, you'd ideally want to see the specified voltage as indicated in the wiring diagram. Typically, it's 12V, but confirm this with the diagram. If you are not confident in your electrical testing abilities, I would advise you to take it to a workshop. Paying 95€ might save you from a headache.

I appreciate the advice. I think I'll heed your suggestion and take it to a workshop. Given my limited experience with electrical diagnostics, it's probably the safest course of action. Thanks again for the help!