2000 e46 Alpina B3 - PDC Unit or wiring fault? - Page 2

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Thread: 2000 e46 Alpina B3 - PDC Unit or wiring fault?

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  1.  
    #11
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    chrisp_1's Car Details
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    No beeper on my (analogue) multi-meter,.... or the car for that matter..., resistance of wires it is then, pretty safe bet, if wires broken the resistance is infinity - i'll find out tmorrow.
     
     

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    #12
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    joylove's Car Details
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    When I had this problem the sensor came to life when I pushed the plug in. The clips had snapped and it need a new connector for about a quid.
     
     

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    chrisp_1 (11-03-2011)

  5. Beep Beep Beep 
    #13
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    chrisp_1's Car Details
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    I though I'd update this thread with the results of my diagnosis/repair.


    First step was to remove bumper strip that holds the 4 sensors



    Note the 'tabs' at the botttom and top of the strip, the ones at the bottom are accessed from underneath the car near the exhaust to effect removal - simply use a small flat blade screw driver to lift the tabs over the bumper edge and work along the bottom tabs toward the middle of the car. By time you do the third or fourth one the strip becomes loose enough to pull-out gently from rear of car. The strip actually slides from side to side when you get all the clips in the middle off, this is to enable you to tuck the ends inside the slits at the sides of the bumper.



    I though I'd cracked it when I saw the crud on the sensor above the exhaust - the faulty one.



    The others were more presentable. The sensor plugs have a single safety clip you need to squeeze to get them off, clip pictured on-top of sensor.



    Once you have unplugged all sensors the bumper strip can be moved to somewhere more comfortable - now is the time to get the sensors out the strip and give them a good clean with contact cleaner (maplins) followed by wd-40. There is a visible tab securing each sensor on the pic above, however, there is also a lug on the opposite side of the sensor with is harder to see and you must pry this out the rubber mount with a small screwdriver whilst pushing the sensor in toward the car by it's face (sensing side).

    At this stage I swapped over the non-working sensor with one from another plug and tried the clicking test with ignition on 2 and reverse selected - same fault, no clicking from sensor above exhaust. I realised I had a wiring or PDC unit fault.

    So I accessed the pdc unit, unscrewed it from the side of the car (behind the carpet between the rear light and battery) and placed it in the boot.





    I then unclipped the white plug from the unit. This is a 12-pin plug which is connected to each sensor by 3 wires (3 wires x 4 sensors = 12 pins!). Sorry I forgot the photo of this part.

    I then used a continuity tester to find which pin went to which sensor/wire. I started on one sensor and using each wire in-turn I connected a multi-metre between the sensor plug and each of the 12-pins until I got a beep - IT WAS USEFUL TO DRAW A DIAGRAM OF WHICH WIRE CONNECTED TO WHICH PIN AS THIS SAVES MUCH TIME BY A PROCESS OF ELIMINATION. This is trickier than expected with only one pair of hands as the probes do not make good contact with the pins on both plugs





    - I decided to part dissassemble the sensor plugs to make getting a connection easier. (I tried inserting a wire but that just creates two dodgy connections instead of one LOL



    The Black outer case was removed first as pictured below (just one safety tab to pry open with small flat blade screw driver and simply push the blue bit out - the black bit is still pictures on the wire if u look closely).



    White locking clip removed next, one safety tab to pry open then it pops up (partly loosened) and can then be clipped off at either side.



    Finally by process of elimination with the multi-metre I identified 11 'beep beep' good connections and 1 x 'no beep' broken connection - in my case the middle yellow wire on surprise surprise the faulty sensor plug.



    After peeling back the black protective tape from the bundle of wires I found this.



    A few electricians skills later and I had re-connected the broken wire.



    A bit of insulation tape on each wire and then to bundle them together gave this.



    I then checked the connection to the 12-pin plug and 'beepe, beep' SORTED!. Re-connected the PDC unit and tested for clicking on all 4 sensors, all ok .

    Re-built the car and hey presto no LOOOOOOOOOONG beep when selecting reverse now, I have my beep beep back again.

    This actually took me about 4-5 hours in-between rain breaks yesterday - I'd guess 2 hours max if I did it again uninterupted. Not that difficult if you know how to use a multi-metre and have some basic diy mechanical experience to remove the trim/sensors/plugs without breaking them etc

    IF YOU'R HAVING PROBLEMS WITH THE SENSOR ABOVE THE EXHAUST THEN AN INSPECTION OF THE WIRING IS OVERDUE - THE HEAT OVER LONG TIME PERIOD HAS MADE MY WIRED VERY BRITTLE.
    Last edited by chrisp_1; 19-04-2011 at 16:10. Reason: detail
     
     

  6. The Following 4 Users Say Thank You to chrisp_1 For This Useful Post:

    joylove (12-03-2011),Kevin Whittaker (12-03-2011),SlowTech (12-03-2011),xXNealXx (12-03-2011)

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  8.  
    #14
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    sam1832's Car Details
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    woohoo,

    Thanks for the update

    Glad you got it sorted
     
     

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    chrisp_1 (12-03-2011)

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    #15
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    Great post!
     
     

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    chrisp_1 (12-03-2011)

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    Glad you got it sorted mate
     
     

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    chrisp_1 (12-03-2011)

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    #17
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    Glad you got it sorted Chris

    and from the few pics you've posted the car looks great mate
     
     

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    chrisp_1 (12-03-2011)

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    #18
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    Quote Originally Posted by SlowTech View Post
    and from the few pics you've posted the car looks great mate
    Agree with you there Simon, that is a rare car to have and it looks cool
     
     

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    #19
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    Nice work and a top update...

    Took longer to take the photo's than fix the job i'll bet...

    Lovely looking car BTW
     
     

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    chrisp_1 (12-03-2011)

  20.  
    #20
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    Quote Originally Posted by Kevin Whittaker View Post
    Quote Originally Posted by NealP View Post
    Agree with you there Simon, that is a rare car to have and it looks cool
    Lovely looking car BTW
    Really hoping Chris will bring his Alpina to a NW meet later in the year, I've only ever slobbered on the outside windows of B3's
    it'd be great to actually get the salivate on the inside of one (that ok Chris?)
     
     

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