Intermittent fault on parking sensors

[ChrisMac]

Hi all I am a bit new to this, I have a California SE TDI 140 2010 reg and the parking sensors have developed a fault. When I first put the vehicle into reverse the sensor display illuminates but then stops and then all I get is a constant sound and then nothing. The switch on the dash flashes for a few seconds and then goes off.

I have taken the vehicle to a garage and have been told that its likely to be a faulty unit or corroded wires on the rear nearside sensor and the only way to get to this unit is by taking all the back paneling out to get below the water tank, which seems very extreme and expensive to me. Apparently there are not enough volts going to the unit. If anyone has any ideas I would be really grateful, thanks for reading this.

 

[WelshGas]

Hi all I am a bit new to this, I have a California SE TDI 140 2010 reg and the parking sensors have developed a fault. When I first put the vehicle into reverse the sensor display illuminates but then stops and then all I get is a constant sound and then nothing. The switch on the dash flashes for a few seconds and then goes off.

I have taken the vehicle to a garage and have been told that its likely to be a faulty unit or corroded wires on the rear nearside sensor and the only way to get to this unit is by taking all the back paneling out to get below the water tank, which seems very extreme and expensive to me. Apparently there are not enough volts going to the unit. If anyone has any ideas I would be really grateful, thanks for reading this.

Was this a VW Dealership or VW Independant.?

If so ask them to read up on the California/Transporter and stop guessing.

versa.

Click on link below. Part 5 is the Control Unit.

As far as I am aware the wiring loom runs up the Kitchen B pillar, behind the kitchen lights trim , through the wardrobes to the rear D pillar then down and through floor to back of rear bumper.

https://www.lllparts.co.uk/catalogs/vw/RDW/CAMP/661/9/919/919000

 

[TripleBee]

Corroded wires on the sensors don't involve taking down any trim. Just unplug the sensor connectors and check it out.
The unit also just seems to be behind the dashboard, not the water tank.
I can understand why people go to independent garages, but sometimes, a (good) dealer is much better. They may charge you more, but MIGHT be able to help you better.