A4 electrical gremlins
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Discussion

Nevin

Original Poster:

2,999 posts

292 months

Saturday 13th February 2010
quotequote all
I have an A4 2.8 Quattro and have been having a few electrical issues which I wondered if anyone might be able to help with. The boot release started working on its own and would trigger on and off rapidly and then stop. The boot didn't open but the latch popped enough for the warning light on the dash to come on. It now won't open at all though.

Then the rear windscreen wiper became intermittent and again has now stopped working completely, although it did come on once the other day whilst on the motorway.

Also, the rear driver's side window has stopped operating too.

I'm thinking either damp has got in somewhere and corroded wires which are short circuiting, or there is maybe a loose wire somewhere.

Anyone got any ideas on where might be a good place to start looking? I'm not really in a position at the minute to spend moeny getting someone else to look at it.

Cheers

Tame Technician

2,467 posts

235 months

Saturday 13th February 2010
quotequote all
Nearside passenger foot well under the carpet. You will likely find you have a sub-aqua conveinience control module.

It will be full of screen wash.

http://www.pistonheads.com/gassing/topic.asp?h=0&a...

http://www.pistonheads.com/gassing/topic.asp?h=0&a...

http://www.pistonheads.com/gassing/topic.asp?h=0&a...

Nevin

Original Poster:

2,999 posts

292 months

Saturday 13th February 2010
quotequote all
Tame Technician said:
Nearside passenger foot well under the carpet. You will likely find you have a sub-aqua conveinience control module.

It will be full of screen wash.

http://www.pistonheads.com/gassing/topic.asp?h=0&a...

http://www.pistonheads.com/gassing/topic.asp?h=0&a...

http://www.pistonheads.com/gassing/topic.asp?h=0&a...
Nice one. Thanks very much. Will go and have a look.

I had done a search but as I didn't know what I was looking for I didn't find those threads

Nevin

Original Poster:

2,999 posts

292 months

Saturday 13th February 2010
quotequote all
Hmm, getting the carpet up could be fun

But thinking about it, I have been getting through rather a lot of screenwash

Edited by Nevin on Saturday 13th February 16:02

Nevin

Original Poster:

2,999 posts

292 months

Sunday 14th February 2010
quotequote all
Okay, is there some special method of getting the carpet up? It runs right from underneath the dashboard to the rear footwwll in one continuous piece and isn't exactly flexible, being as its backed with thick foam.

Also on the initial lift I couldn't see or feel any dampness but I may not have had the carpet far enough up. Couldn't see any control module either, but if its on the transmission side of the passenger footwell then again I may not have gone far enough.

Tame Technician

2,467 posts

235 months

Sunday 14th February 2010
quotequote all
oops! maybe yours is too old to have one. Didnt think to ask how old the car was, my bad very sorry, it just the faults your were having are totally text book for that problem, I may have jumped the gun.

If its got one, its right where the front passengers feet would be. So you prise off the plastic sill trim in the front passenger door way and just lift up that edge of the carpet, as you say its not very flexable, a pry bar and a torch should show it up. I usually unbolt the seat and tip it back to help avoid ripping a customers carpet.

Even if you dont have the module the washer pipe joint is still near there so you can check to see if you can find that leaking, probable right at the bottom of the A pillar.


Nevin

Original Poster:

2,999 posts

292 months

Sunday 14th February 2010
quotequote all
Tame Technician said:
oops! maybe yours is too old to have one. Didnt think to ask how old the car was, my bad very sorry, it just the faults your were having are totally text book for that problem, I may have jumped the gun.

If its got one, its right where the front passengers feet would be. So you prise off the plastic sill trim in the front passenger door way and just lift up that edge of the carpet, as you say its not very flexable, a pry bar and a torch should show it up. I usually unbolt the seat and tip it back to help avoid ripping a customers carpet.

Even if you dont have the module the washer pipe joint is still near there so you can check to see if you can find that leaking, probable right at the bottom of the A pillar.
Its a V-reg so could be too old. I'll have another look tomorrow. Everything actually appears to be very dry down there under the carpet.

Someone stole my socket set too so I may need to borrow one prior to unbolting the seat

Nevin

Original Poster:

2,999 posts

292 months

Tuesday 16th March 2010
quotequote all
Not been using the car much but finally worked this one out today. The connector where the washer fluid pipe goes into the rear wiper unit is leaking. The water us running down onto the barrel lock unit and has shorted it out it would appear, its certainly covered in corrosion/crust.

Does anyone have any idea how to get the lock barrell and back section out? There are two bolts which held it on to the tailgate. I have undone them and nothing else is visible but it isn't budging. Does it just need a tap with a hammer or is there something else to undo?

Its a 99 2.8 Quattro Avant for reference.