Get to your PDC unit (water issue)

This section shows how to carry out modifications to your 1 Series. Please remember that if you are modifying your car to take photo's at each step and document the mod in here.
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jaybeerex
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Re: Get to your PDC unit (water issue)

Post by jaybeerex » Sun Oct 12, 2014 2:35 pm

Well theres good news and bad news, first off this guide helped me have the unit removed in literally 5 mins, great work!

the bad news however....

As soon as i opened the lid i could see we have an issue here, the clear indicators of corrosion, despite there being no visible sign of moisture historically in the well. Strange.... but then it is a 54 plate so its had plenty of years to corrode :(

Image

After a light bit of general cleaning just with a dry old toothbrush the corrosion came away, and one of the pin legs on this chip seen here had completely corroded away to nothing :( it's so fine iseriously doubt i can get it soldered on and the car is for sale at the moment so looks like I'm selling it with a PDC fault

Image
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Anish1993
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Re: Get to your PDC unit (water issue)

Post by Anish1993 » Sun Oct 12, 2014 5:09 pm

timk wrote:Wow that looks toast!

Here is what mine looked like and it was completely stuffed:

Image

I found a used one on eBay, I made sure they took pictures of inside and asked if it had any water damage before purchasing!

Cheers
Hey mate im also trying to catch one on ebay for light change. Do i have to get another unit with a matching number. my box has the numbers 66.21-6973115.

I was on ebay and theres plenty some for e46's for £10 all numbers matches except like 1 digit.

can i not use a unit from a different car? or do all numbers gotta match

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Re: Get to your PDC unit (water issue)

Post by timk » Thu Dec 11, 2014 2:50 am

Anish1993 wrote:Hey mate im also trying to catch one on ebay for light change. Do i have to get another unit with a matching number. my box has the numbers 66.21-6973115.

I was on ebay and theres plenty some for e46's for £10 all numbers matches except like 1 digit.

can i not use a unit from a different car? or do all numbers gotta match
Hey Anish1993,

Sorry for not getting back sooner! My original part # was 6982390 and I replaced it with a unit labelled 6982395. I looked up my old part number online (sorry I can't remember where now) and it mentioned 6982395 as a superseding part #. I think it's pretty important to get this right.

After fitting the new PDC I had to use the BMW tools to reset an error before it would work.

Cheers

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Re: Get to your PDC unit (water issue)

Post by pdcunitbroken » Mon Apr 20, 2015 6:42 pm

Hello,

I have had the same problem with PDC unit not working. Couple of things though, my 1 series (118d, 06 plate) had a bluetooth headset when I bought it. I used to hear beeps when I put the car in reverse but the rear sensors didn't actually work (no sound when I reversed close to things, no clicky noises from the sensors).

I had the bluetooth headset removed, still didn't work, so I got a new pdc unit and replaced it. I have put everything back together with the new PDC unit and my rear sensors are still not working. (I don't even get the beeps when I put the car into reverse).

I'm not sure how to proceed now, there are no errors on my dash and haven't been at any point and the sensors still don't make any clicky sounds :cry:

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Re: Get to your PDC unit (water issue)

Post by pdcunitbroken » Wed Apr 22, 2015 8:23 am

Problem solved! I hadn't plugged in my new PDC unit properly :shock:

So glad I didn't take it to the dealers.

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Re: Get to your PDC unit (water issue)

Post by marco_polo » Wed Apr 22, 2015 9:07 am

Lol, glad to hear you got it sorted. :)
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Re: Get to your PDC unit (water issue)

Post by bris1series » Thu Jul 30, 2015 11:14 am

Hello Guys,

Sorry to bring this thread back up again just wondering if somebody can answer a few questions if possible. I’ve got a 1 Series 118d 56 Plate and I’ve recently experienced the problems within this thread along with the same issues detailed in this one:

viewtopic.php?t=67502" onclick="window.open(this.href);return false;

Both state it’s the PDC unit which is brilliant I’m not very technical with cars I have friends for that so this guide is detailed perfectly I’m going to give it a try myself. I can see water being in that section of the car without even looking (the error started driving on a very rainy evening).
However my questions are:-

- Once I take the PDC unit out and put it into a bag of race in a warm area how long would be a reasonable time to leave it out for 24 hours?

- Will I still be able to use the car once the PDC unit is out? I’m asking as I have the problems detailed in the other thread with the dashboard/speedo etc (Will the speedo/rev counter still be flickering?)

- If worse comes to worse and I have to buy a new PDC unit, I’ve read through pages of this post and they say try your best to find one with the same part number if not and my PDC is banged and I need to buy a new one (Checked eBay around 75-100£) how much approx is it to code to the car as you all mentioned?

Hopefully its not to tricky and I can get the clips and stuff off I'm sure ill post in here if I have any trouble haha.

Thanksss Guys, once again sorry to bring this post back up.

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Re: Get to your PDC unit (water issue)

Post by marco_polo » Thu Jul 30, 2015 11:29 am

As long as it takes, 24 - 48 hours in the airing cupboard + rice. Fingers crossed that works for you. Remember to mount it higher when refitting!!

Yes, the car will be fine. Just don't reverse silently into any posts!

What are the coding rates for you local indy? Main dealer will bend you over.
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Re: Get to your PDC unit (water issue)

Post by bris1series » Thu Jul 30, 2015 11:47 am

Thanks for the reply :)

Is it a tricky job to take out and put back in or am I going to be able to figure it out quite easy haha, thank you ill be sure to make sure I mount it higher when refitting! anything else I should be doing/keeping an eye out for?

Hopefully it works but to be perfectly honest with you I have no idea how much it'll be around my area (Bristol) I know of a few BMW specialist garages so will try those guys first if it comes to it, hopefully it doesn't!

Thanks!

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Re: Get to your PDC unit (water issue)

Post by marco_polo » Thu Jul 30, 2015 1:08 pm

It's pretty easy if you follow this guide. :)
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Re: Get to your PDC unit (water issue)

Post by bhara » Sun Aug 30, 2015 2:10 pm

Many thanks to Lee for posting a very helpful guide. I had the same problem and after a brief search hit upon this blog. I have 61 number plate 120D MSPORT. Had PDC warning sign flashing when PDC switch was switched on or in reverse gear. This started happening after the car was used for the first time after being parked for about 4 weeks in open. Soon had all the warning lights came on with dreadful ting sound. All warning lights started flashing after every 1-2 mins. Things got worse yesterday when dashboard just switched off completely while driving. No speedometer, no rev meter no fuel gage.. indicators and radio also stopped working.

fearing and expecting the same PDC issue I followed the steps in order to have a look in the well. And bingo, found 1 inch deep water in the well. Took out the PDC unit. Besides seeing a lot of moisture on the unit I also saw white residual stuck to the legs of one of the IC chip on the board. Left the unit overnight submerged under rice... next day cleaned and brushed using nail polish remover, dried the unit with hair dryer.. Made sure that all the white residue has been cleaned off the board.. And then put everything back... and was glad to see everything working - all electricals and my front and back PDC system. Can't thank Lee enough for the guidance...

However, I still haven't been able to figure out exact location of water ingress. I observed bottom 1/3rd of the vent filter was drenched with water. Not sure if that's where the water has been coming in. Am expecting the problem would resurface after a few months (or years) when the water level rises again in the well. I am looking forward to some views on how to get the issue fixed permanently. Will drilling the hole in the plastic plug sort out the issue or should I just place the PDC in much higher horizontal position. Any ideas?

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Re: Get to your PDC unit (water issue)

Post by marco_polo » Sun Aug 30, 2015 2:13 pm

Both. Create a drain, and mount the Module far higher.

The vent is the usual culprit. If it's been wet for a while, check the chassis rails (under the car - remove 4 bungs) and the rear seat for water too.
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Re: Get to your PDC unit (water issue)

Post by bhara » Sun Aug 30, 2015 7:07 pm

Thanks MP,
I removed the plugs to take out water from the Chassis. Also, used the following video to know the location of the plugs:
https://www.youtube.com/watch?v=o_S_oGIRbNo" onclick="window.open(this.href);return false;

There was considerable amount of water blocked on both sides which just poured out.

Now the question is - should we leave the holes unplugged to stop any future blockage of water or doing so would cause other issues? your advice?

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Re: Get to your PDC unit (water issue)

Post by marco_polo » Sun Aug 30, 2015 9:37 pm

Chassis plugs back in once it's dried out, and drill drain holes in the Well plugs (under modules on both sides of the boot).
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Re: Get to your PDC unit (water issue)

Post by bhara » Tue Sep 01, 2015 2:13 pm

Thanks MP,

I drilled the hole in the plug today.

Meanwhile had an interesting observation. It's been just 24 hrs since I had put back the PDC unit after drying the well and had drained the chassis water. Today when I opened the whole stuff again to drill the hole in the plug I saw 1 inch water logged there in the well. I was surprised. The car had not been used since I last closed the trim. It has been parked on the driveway all throughout. However, it has been raining, pretty much since then - I believe out of last 24 hrs there has been rain, though light, for atleast 16 hrs. Even then, how can so much water can ingress in a day? Water was found in the Chassis as well. That proves it doesn’t take months for the well to get filled. It can happen in a few hours under rain.

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