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Thread: Parking Sensors stopped working, Please Help?

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    Unhappy Parking Sensors stopped working, Please Help?

    Hello all. Not sure if i'm putting this request in right place? This is 3rd time asked, hopefully a response this time.

    My parking sensor system stopped working. I think they are factory fitted, as all wiring is very neat with exterior wires in plastic trunking. The symptoms are; when reverse engaged just a single slightly long 'bing' sound with the switch lighting up (the one to manually turn on/off the system). The dash light also comes on (a P with wifi type symbol next to it) I believe these means a fault.

    Here is what I've done:
    Fuses OK; I took all 8 sensors off and tried to measure with meter but not sure what resistances I should find. They appear similar; 1-3 MegOhms typically between pins 1-3 and between 2 and 3. There is a very fixed 6 kOhm between pins 2 and 3. When system is on with engine off (i put in reverse) if you put your ear to the sensors I can hear a low frequency pulse as mentioned elsewhere on this forum I? Does this mean sensors OK? I noted a BOSH box in the little stowage area near rear light clusters. It does not say anything about parking but has the number 965 in a circle which is also on the sensors themselves? Is this the sensor control box?

    Any tips on how to check the system out? Can it be tested? Has anyone got a circuit diagram for the OEM system fitted to the estate model??

  2. #2
    Regular Member Hummelshøj's Avatar
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    Quote Originally Posted by Snizzers View Post
    Hello all. Not sure if i'm putting this request in right place? This is 3rd time asked, hopefully a response this time.

    My parking sensor system stopped working. I think they are factory fitted, as all wiring is very neat with exterior wires in plastic trunking. The symptoms are; when reverse engaged just a single slightly long 'bing' sound with the switch lighting up (the one to manually turn on/off the system). The dash light also comes on (a P with wifi type symbol next to it) I believe these means a fault.

    Here is what I've done:
    Fuses OK; I took all 8 sensors off and tried to measure with meter but not sure what resistances I should find. They appear similar; 1-3 MegOhms typically between pins 1-3 and between 2 and 3. There is a very fixed 6 kOhm between pins 2 and 3. When system is on with engine off (i put in reverse) if you put your ear to the sensors I can hear a low frequency pulse as mentioned elsewhere on this forum I? Does this mean sensors OK? I noted a BOSH box in the little stowage area near rear light clusters. It does not say anything about parking but has the number 965 in a circle which is also on the sensors themselves? Is this the sensor control box?

    Any tips on how to check the system out? Can it be tested? Has anyone got a circuit diagram for the OEM system fitted to the estate model??

    I have had similar problem..

    Took it to the stealers and they put the Tech2 on it and told us it was the sensor outer right side at the back that was faulty.. New sensor and it worked again...

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    [Ex]Admin Duncan's Avatar
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    Quote Originally Posted by Snizzers View Post
    The symptoms are; when reverse engaged just a single slightly long 'bing' sound with the switch lighting up (the one to manually turn on/off the system). The dash light also comes on (a P with wifi type symbol next to it) I believe these means a fault.
    I had an aftermarket kit (Cobra) on mine which developed a fault and it emitted that long continuous tone instead of the normal interrupted tone.

    The issue with mine was the wiring to one sensor had become corroded at the sensor end and broke the connection. On these systems if one sensor is disconnected/broken then you get the continuous tone.
    Quote Originally Posted by Snizzers View Post
    When system is on with engine off (i put in reverse) if you put your ear to the sensors I can hear a low frequency pulse as mentioned elsewhere on this forum I? Does this mean sensors OK?
    Yes. that's the simplest way to verify whether each sensor is working. When in reverse just take a finger and touch it on each sensor, you'll feel a vibrating pulse if it's working correctly. On mine one wasn't so I knew to look further at that one and found the corroded wiring. Hopefully you'll find one that isn't pulsing and it'll be an easy fix - mine was to simply buy a replacement sensor as there was no way, with the way it was wired and the tiny plug it used, that I was going to be able to solder it.

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    Regular Member lee gsi's Avatar
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    Put it in reverse and bend down and have a listen at the sensors.

    You should hear a clicking noise if they are working.

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    Quote Originally Posted by lee gsi View Post
    Put it in reverse and bend down and have a listen at the sensors.

    You should hear a clicking noise if they are working.

    But make sure the handbrake's on, wouldn't want to hear it warning you're about to run yourself over........
    Last edited by Grumpy1954; 27th August 2010 at 20:09. Reason: spelling correction

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    Thanks for all replies. I eneded up getting Vax to look at it. They found the rear drivers side sensor failed. It was replaced and now OK. £135 for parts dignstic an labour.

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    OMG, you could have got sensors fitted to a car without them for £135!!!!!!!!!!!!

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    [Ex]Admin Duncan's Avatar
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    Was just thinking the same! £135 seems extremely steep just to sort out a single sensor, although once you break it all down I can see how they get to that figure.

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