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Author Topic: Rear parking sensors  (Read 3986 times)

Offline johnnyroper

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Rear parking sensors
« on: November 21, 2015, 08:57:40 am »
My rear parking sensors are not working just get the continuous beep when selecting reverse,vcds shows all 4 sensors are faulty. Anyone any experience of this is it likely to be all sensors at fault or a wiring problem? I don't mind changing sensors just don't want to replace them if they are not the fault. Apart from vcds is there any way to test them individually?

Offline insanitybeard

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Re: Rear parking sensors
« Reply #1 on: November 21, 2015, 09:21:15 am »
Has it done this since you owned the vehicle? I find it quite unlikely all four sensors would pack up, more probable that a common live feed or earth to the sensors has failed. The wiring diagram shows a common branched red and brown wire to each of the rear sensors, which I'm assuming is live and earth, with a third (I'm assuming) signal wire, it's only the signal wire that is unique to each sensor and a different colour so if you've lost a live feed or the earth at the multiplug end (or there's corrosion) where the loom connects back to the body wiring it could have shut all the rear sensors down.
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Offline johnnyroper

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Re: Rear parking sensors
« Reply #2 on: November 21, 2015, 10:56:16 am »
Thanks for reply.

Yes has done it ever since I got car but sorting other issues this one been on back burner.
Cheers for wiring diagram will have a poke around with the fluke and see what's going on.

Offline Chrispb

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Re: Rear parking sensors
« Reply #3 on: November 21, 2015, 01:17:57 pm »
Hi johnnyroper

For the sake of less than a tenner get yourself a VCDS lead and scan the park assist module.
The wiring can be a bit delicate and unnecessary fiddling with the wiring may give you more problems than you had to start with.
It's also a very useful tool to have when diagnosing other faults on the car.
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Offline johnnyroper

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Re: Rear parking sensors
« Reply #4 on: November 21, 2015, 04:03:30 pm »
I have got vcds and already scanned it to find 4 fault codes 1 for each sensor.

Offline Chrispb

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Re: Rear parking sensors
« Reply #5 on: November 21, 2015, 04:19:17 pm »
 [OOPS] my bad should have read first post.
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Offline johnnyroper

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Re: Rear parking sensors
« Reply #6 on: December 30, 2015, 01:02:38 pm »
Finally found time to check this out.

12v to all sensors and good earth when all switched on,checked wiring from control unit to sensors all ok at 0.1ohms so either I have a duff control unit or all 4 sensors are indeed u/s.
The control unit is not water damaged so I am leaning towards sensors got a 50/50 chance of sorting it no matter what part I change.

 

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