Get to your PDC unit (water issue)

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Re: Get to your PDC unit (water issue)

Post by marco_polo » Wed Jan 06, 2016 7:01 pm

BigJimNoFool wrote:Anyway for piece of mind i bagged up the PDC unit and cable tied it to a secure cable which was running above the vent.
Wise man.
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Re: Get to your PDC unit (water issue)

Post by BigJimNoFool » Wed Jan 06, 2016 7:56 pm

Wise man.
8)
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Re: Get to your PDC unit (water issue)

Post by Bux » Fri Jan 15, 2016 12:25 pm

Time for me to chip in now!

Long story short, my PDC unit failed and i narrowed it down to this water issue. Today has been sunny so i thought i would take it apart and get a bunch of pics...

There was about 2 - 3 cm of water...

Image

Image

Image

Image

I think this one might be unsalvageable using the old rice trick! So gonna have to look for another!
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Re: Get to your PDC unit (water issue)

Post by Bux » Mon Jan 18, 2016 7:38 pm

I had a look on RealOEM and found a variety of Part No's which all claim to work. Found the one which superceded mine and bought it on ebay for £70. Recieved it today, plugged it in and all working again! Now I just have to sort that leak out!
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Re: Get to your PDC unit (water issue)

Post by Major_Sarcasm » Fri Jan 29, 2016 5:42 pm

Yet another 'PDC knackered' post... 2007 facelift 123d M Sport here.

Fun, fun, fun: PDC light started flashing the other day then packed up altogether. Did a bit of Google-Fu and found this thread (thank you Lee!). Removed all the relevant plastics and found the usual 2 inches of water in the well. PDC = buggered (one of the chips on the board was legless! No hope of repair as there was nothing left to solder to).

I eBay'd another PDC unit, managed to get the same part number, so no re-code luckily, plugged it in and sensors work again.

I've slapped a load of silicone around the vents on both sides of the boot (the other side was awash too) and have drilled some holes in the plastic bungs. Do I also need to drill the bungs in the chassis box section? Is that where the water in the wells comes from or is it all coming in around (through?!) those vents? I don't have a damp rear seat problem...

Just re-reading the thread; I might check my rear lights too.
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Re: Get to your PDC unit (water issue)

Post by marco_polo » Fri Jan 29, 2016 6:29 pm

Yeah, rear light seals are the usual suspects, not a very clever design.

I'd pull the 4 box section plugs, check inside for any water.
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Re: Get to your PDC unit (water issue)

Post by Hop120d » Wed Feb 03, 2016 4:25 pm

Hi All,


Owns : 2007 E81 M sport BMW 120d

So... After being a Lurker here for the last couple of weeks searching for answers to my problem, i find myself here. another victim of the swimming PDC.

I first noticed that the PDC was not working a couple of weeks back, it would throw an error every time i started the car. that stopped completely, so after some research i found this post. which is amazingly informative btw! i always thought that the water i could sometimes hear sloshing around in the back, was diesel. when i followed this guide to get to the PDC area, true enough there was a swimming PDC unit, (the other side is fine)

I removed the PDC dried it out, drilled some holes in the plastic bungs so this cannot happen again, i think the water has come in through the light cluster, I've changed the lights in the past, so this must be how it got in.

i also discovered that it can cause wet seats, (true enough the back seats were slightly wet), with water seemly coming from the bolts that hold the seat belts in, but i cant be sure.

what puzzles me to no end, is how do i remove this water, and how did it get there? it seems to be under the seats, inside the frame of the car!?

I've removed 4 bungs from underneath the car, little water came out. still can hear sloshing around. i'm completely stuck and just want to remove the water from the chassis, took the car to a Indi, told me to check in with a body shop because he has no idea. :cry: :cry:

does anyone have any experience with this at all? - am i missing something after reading this thread over and over? :?



p.s my PDC unit no longer works, i wonder if its a fuse or its just toast, it didn't look to bad after id dried it out, im having issues finding a replacement on the web. any ideas on that?



Thanks for taking the time to read, and glad to have finally joined this wonderful forum :D :D :D :D

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Re: Get to your PDC unit (water issue)

Post by marco_polo » Wed Feb 03, 2016 4:38 pm

You've done everything right so far. Those two chassis legs join into the swimming pools with yet more plastic bungs.

You've already added some sensible drainage, so I'd just make her water tight as possible, and leave those bungs out underneath for a while to allow the chassis to dry. You could try some compressed air in there, if you have access to a compressor? Or possibly attack it with rags / desiccants / heat / dehumidifiers / etc?

I'd leave the rear seats out if you can, for the minute.
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Re: Get to your PDC unit (water issue)

Post by Hop120d » Wed Feb 03, 2016 4:53 pm

Hi Marco Polo,

Thanks for the quick response :D - Yes, currently the back seats are removed until i'm sure its all sorted, this is not a problem.

I've re tightened the rear lights and kept an eye on those, and even after heavy rain, everything remains dry, so i'm confident that its tight now.

i will search when i can for any more plastic bungs, i removed 4 i believe, 2 fairly close to each other on each side.

i don't have access to a compressor, but that something i can consider should i come across someone with one. what i have done is bought 4 1kg bags of silica to lump in the car to see if this helps with the seeping from the seat belt bolts as mentioned in above post. (at least that's where i think its coming from)

I'm really hoping that i can find some bungs and release the water inside - it sounds like a lot in there! :shock:


Also - My dried out PDC unit seems to not work, but i cant be sure. it wont even pick up there is one when its plugged in, no error etc - do i need to code this in or does this indicate that its fried? could it be a fuse? just making sure before i start the hunt for a new one.

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Re: Get to your PDC unit (water issue)

Post by marco_polo » Wed Feb 03, 2016 5:02 pm

If you plug in a working PDC module it should simply work again. Fuse is 1000:1

I wonder if you can park nose-down on a very steep gradient, to get gravity to help the water on it's way out of the seatbelt holes?? I haven't been under an E87 is a couple of years, can't remember exactly what's what anymore I'm afraid! :oops:
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Re: Get to your PDC unit (water issue)

Post by Hop120d » Wed Feb 03, 2016 5:18 pm

Ah, must be duff then :( :( .

Ill check the fuse. but cant see it being that. :roll:

Ta for all your help Marco, if anyone else gets the same issue - and manages to resolve one way or another, do tell :D :D

i will post back here when i sort the problem,


i will try the hill at some point.


Ha :lol: - no problem Marco - i appreciate the weigh-in anyhow!



For now,


Hop

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Re: Get to your PDC unit (water issue)

Post by jure » Tue Feb 16, 2016 4:21 pm

Hello!

I am new to this forum and i also have problems with my PDC unit. I have 2008 120d e82, front&rear PDC.

Yesterday I had a look into my boot where PDC module is located and found 3 inch of water :D So I disconnected the PDC module as I saw on previous posts and put it in the bag of rice. Now I am waiting for a miracle :oops:

But here is another question. I should get yellow warning sign, telling me there is something wrong with the system. My system didn't even inform me about any problems with PDC, to me it seems like it doesn't know that I even have PDC. My button for turning off/on PDC is not responding (LED light not working), I don't have any "PDC failure" or sth like that on my dashboard (Fuse is OK). How do I know that (after proper drying and reconnecting) my PDC module is working.

Do you have any suggestions what might be wrong. I will try to remove the battery for a while, trying to restart the system, maybe it got used to this failure :wink: ...

And I was also reading sth about testing sensors with gear selection (1st for front and R for rear) and listening to the sensor. Is this possible with PDC unit disconnected (I guess not).

Thanks guys, have a nice day regards from Slovenia :mrgreen:

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Re: Get to your PDC unit (water issue)

Post by marco_polo » Tue Feb 16, 2016 6:11 pm

You rarely get a warning when it's wet.

No you can't test the sensors without a PDC module powering them.

Good luck with your miracle! :)
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Re: Get to your PDC unit (water issue)

Post by jure » Tue Feb 16, 2016 9:53 pm

Thanks for response! :D
So if I reconnect the module when dry i should be able to get at least yellow sign on dashboard otherwise it is completely dead?

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Re: Get to your PDC unit (water issue)

Post by Madtoady » Wed Apr 06, 2016 8:06 pm

I recently changed my rear lights and seems the seal wasn't quite right and a week after installation after lots of rain I had the dashboard Christmas tree effect and my parking sensors went all funny.

I went to a local indie and he said it was probably the common water damage and was looking at £175 parts + labour for the work. After some research I came across this thread and removed my PDC unit. It had already been wrapped in a thin freezer bag so my car had had the problem in the past. Water had somehow got into the bag and PDC and started to cause damage. After a few days in a bag of rice, I wrapped the PDC in cling film and 3 layers of decent freezer bags and sealed with tape, I put my boot back together again and it all worked perfectly! Thank you for this thread :)

P.S. There's a BMW breaker on Ebay called 'cladan74' who stocks alot of PDC module model numbers and sells them for £65.
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