2000 e46 Alpina B3 - PDC Unit or wiring fault?

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  1. 2000 e46 Alpina B3 - PDC Unit or wiring fault? 
    #1
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    chrisp_1's Car Details
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    My latest project, the Alpina B3 3.3 has developed a fault with the PDC (rear parking aid) on the corner passenger rear .

    I have found that the passenger-side corner sensor is not 'clicking' when reverse is selected;

    I have also found that all four sensors 'click' ok when plugged into other 3 locations (plugs) but not in the passenger side corner plug;

    I have therefore got a wiring or control unit problem -

    can anyone advise on best way forward with diagnostics?

    are there any in-line plugs in the wring between sensor plugs and pdc unit i can check for dirt and broken wires etc?

    where is the pdc positioned on a coupe with satnav and cd-changer?

    cheers

    ps I am getting 0 Volts on that senor plug!!!
    pps Have just fixed rear lights as they were letting in water so could be damp somewhere
    Last edited by chrisp_1; 10-03-2011 at 17:17. Reason: detail
     
     

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    In my sig there is a link for changing a sensor, and problem solving,

    If you have o volts between all three of the connections. There is either a problem with the pdc unit or the wireing,

    I would go first with wireing, as that is going to be the cheapest the wire is easily replaced, its just plugged into the pdc unit,
     
     

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    chrisp_1 (10-03-2011)

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    http://www.google.co.uk/url?sa=t&sou...SfFT4g&cad=rja

    didn't help me but looks useful if your that way inclined.
     
     

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    Quote Originally Posted by sam1832 View Post
    In my sig there is a link for changing a sensor, and problem solving,

    If you have o volts between all three of the connections. There is either a problem with the pdc unit or the wireing,

    I would go first with wireing, as that is going to be the cheapest the wire is easily replaced, its just plugged into the pdc unit,

    Thanks - read your guide previous - mine are located in the black strip toward the lower end of bumper. Not sure where control unit is????, on drivers side of boot is the battery, passenger side has sat-nav / cd-changer. Haven't ripped all boot trim / carpet out yet though as trying to avoid any unecessary dismantling by asking for location first?????

    Anyone?
     
     

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    Behind boot trim battery side midway between the rear seat and tailgate.
     
     

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    chrisp_1 (10-03-2011)

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    Quote Originally Posted by NealP View Post
    Behind boot trim battery side midway between the rear seat and tailgate.
    found the bugger, have loostened the mount to improve access to box and used the plug lock to unclip the plugs ( black strip on white plug!) but they won't pull fully away from the unit??? Missing something?



     
     

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    Loosened? They fall down to unplug themselves. Lever both clips to the right
     
     

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    Quote Originally Posted by NealP View Post
    Loosened? They fall down to unplug themselves. Lever both clips to the right

    wasn't pulling the levers all the way over.

    Box is now removed, I've taken the top off and stuck it on radiator to warm/dry - doesn't seem to be damp and cannot see any dry joints / blown resistors etc???

    I presume I can check the wires aren't broken by using a multi-meter across the pins on the 12 pin plug and the sensor plugs in-turn (check of resistance across each wire?)
     
     

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    http://cgi.ebay.co.uk/BMW-E46-PDC-CO...item3ca69965c1

    are these the same item - slightly differnet codes to mine but looks same, all the others are white boxes?
     
     

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    Quote Originally Posted by chrisp_1 View Post
    wasn't pulling the levers all the way over.

    Box is now removed, I've taken the top off and stuck it on radiator to warm/dry - doesn't seem to be damp and cannot see any dry joints / blown resistors etc???

    I presume I can check the wires aren't broken by using a multi-meter across the pins on the 12 pin plug and the sensor plugs in-turn (check of resistance across each wire?)
    Yup i would check the wire, with a multi meter on continuity, (beep)
     
     

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