BMW E46 320i 2001 Parking Distance control problems

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  1. BMW E46 320i 2001 Parking Distance control problems 
    #1
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    Can anyone out there help???
    My PDC system stopped working last month and all I get now is a 4 second bleep when engaging reverse.
    The car had to go in for routine servicing, I asked the BMW service dept to diagnose the problem. (extra £36 for this)
    They said it was the PDC unit and would cost £140 to replace.
    Now, me being a skin flint said no thankyou!!
    I bought a s/h PDC unit and fitted it. Just the same still not working.
    I tried the original and the replacement units in my friends bmw 320i and they both worked, so the PDC unit is OK, Fuse OK. I visually checked all the pins and plugs at the control box end and I cannot hear any ticking noises from any of the sensors so what next??
    At last I am now going to ask the questions :- do the bumper sensors work in series ?, is there a master sensor ??, if one goes do they all go ??? and finally what else can I check?

    Seadog
     
     

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    I'm presuming the sensor faces are all clean, so it might be worth while if you unplug each sensor and clean the contacts on both plug and receptacle. They are all linked in parallel, so if one goes then the others should still work.
     
     

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    seadog (15-10-2008)

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    Hi NealP, I will give it a try

    Seadog
     
     

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    Sorry no go, all connections seem to be okay sensors clean,
    Any more suggestions would be very welcome
    so come on all you Bimmer fans get thinking!!!!!!!!!!!!!!!!!!!!
    Seadog

    HELP reqd with this one!!
     
     

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    Ok, since your friend is obliging with letting you fit the control unit to his car, then maybe he can let you borrow a sensor or two so you can try them on your car to isolate sensor fault. If that doesn't work, then you are looking at a wiring loom problem.
     
     

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    If one sensor goes it doesn't shut down the others
     
     

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    I have seen problems where a faulty sensor has caused the system to shut down....thats why the PDC unit is issuing the beep for a few seconds when reverse is engaged..its the PDC telling you that the system is faulty.However when they checked it at the dealer.the faulty sensor should have shown up.Do you have front AND rear PDC??Checked the wiring behind the rear bumper.I think that there should also be a connector block in the boot area in one of the corners.Check the connections there as well.
    Robbo
     
     

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    thats why the PDC unit is issuing the beep for a few seconds when reverse is engaged..its the PDC telling you that the system is faulty.However when they checked it at the dealer
    On EU cars Robbo, there is a car memory setting that you can enable to tell the driver reverse is engaged and this is the long beep sound you get. It may be different for US cars
     
     

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    Quote Originally Posted by RobboSRT View Post
    .However when they checked it at the dealer.the faulty sensor should have shown up.Do you have front AND rear PDC??Checked the wiring behind the rear bumper.I think that there should also be a connector block in the boot area in one of the corners.Check the connections there as well.
    Robbo
    thats probably because they didn't even look at it - they arn't interested in spending time finding faults and fixing things. They just want to replace parts like discs and pads as its easy...

    An decent auto electricion would have found that fault for probably £20, and then fixed it pretty cheaply i would imagine.

    Don't ever pay a main dealer half an hours labour to 'diagnose'.... they don't know how to
     
     

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    seadog,
    As Neal has pointed out there is a Car/Key setting for the beep feature,is that how yours was set up prior to the problem you are now having??If the green LED in the PDC button is flashing,and the audible beep is given for a few seconds there is definately a fault in the system.
    Not all BMW dealers are thieves and bandits,and more often than not it is the technician who is diagnosing the problem that is the idiot....and believe me when I say that I have worked at numerous dealers in the Middle East,The States and the UK,and there are quite a few clowns......technicians and customers out there
     
     

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