Rear parking sensors problem.

[Kenny Duncan]

I'm new to the VW Transporter T6. I am slowly getting through the list of jobs that need done on my van. The one issue I am stuck on is that the rear parking sensors do not work. When you put the van into reverse the speaker sounds for a few seconds then nothing, no display from the screen on the dash, all other functions work correctly, as far as I can see ( the unit has 8 buttons and 2 control knobs). I have checked and there is 6.2v being delivered to each sensor. I have tried listening for a clicking sound but can't hear anything. Is there a way to test each sensor with a meter? Where else should I be looking? What should the return voltage from the sensor be? Could someone point me in the direction of a good wiring diagram for this?

Thank you for any information given.

 

[AdL]

Had the same problem with the front sensors on my T6. Took some practice to be able to hear them. Place something solid metal, like a knife, gently on the surface and hold lightly. You should feel and hear the vibrations. None of my front sensors were working. Turned out there was water ingress in a multi plug junction which had corroded the terminals. Apparently a common problem.