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2017 Mk3 TT Owner Facing Flickering LED Lights & Random Trunk Unlocks – Seeking Advice!

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2017 mrk 3 tt boot opening electrical issues
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1.1K views 3 replies 4 participants last post by  wlondoner  
Q
#1 ·
Howdy y’all, my first post and my first issue!
I just purchased a 2017 mrk 3 TT a few months ago.

Just recently I have noticed and experienced two new issues for me as the second owner of this car. The first is a flickering of my license plate LED lights, I noticed they are a bit dirty on the inside and one has a small bug in the plastic housing so I just assumed the housing is not sealed perfectly but no biggie at some point I will pull the part off and clean up the led housing, but with they rise of the flickering and not working lights I want to try to address this issue as I believe it is also a fix-it issue in my state but I am a bit of a perfectionist as well.

The second is an unlocking / or unlatching of the rear trunk/boot/glass. I have gotten into my car and been just about to pull out of the driveway and been shown a trunk open notification. I have had this happen enough times that I know I am not pushing the trunk releas button on my keys by accident, and I have no culprits I suspect in my house as well as I keep my keys to myself. It looks like the rubber seal of the actual grip to open the trunk is a bit worn and about to split bit I almost sure this would not cause this sudden change in temp and moisture to be opening up the trunk all of a sudden with such consistency.

My suspects are a few items:
  1. MISC electrical phantoms, I have seen a few forums talking about random trunk openings but not both trunk and LED light.
  2. Water in the electrical system, I have not had any issues with backup camera, or active wing or even opening the trunk when I do want the trunk release to trigger…
  3. Bad part seal or just bad part. ( 8S0827574C9B9)
My request is for information, similar problems and possible solutions.

Anyone have experience replacing this part( 8S0827574C9B9)? Anyone have the same issues in the midwest? Anyone have video links about replacing that part or swapping LED’s or addressing a trunk opening issue?

Anyone have anything, I would rather not fork over 2k to Audi to “take a looksie”.
 
W
#4 · (Edited)
Very very common, this needs to be a sticky post on the MK3 forum really, why isn’t it?

Water is getting in and not coming out causing you issues.

Clean the gutters (so there’s 2 holes nearer either end in the black plastic tray when the spoiler is up, make sure they are unblocked (they drain out via tubes at the side of the boot) and also on either end there are like rubber drains too, make sure they are free of dirt and also clean all around the spoiler and also see if you can see where the leak is coming in.

And for a quick “fix” but it doesn’t stop the water coming in but does stop most of the the immediate damage is to drill holes (2 or 3 little ones using something like a standard ikea drill will do) into near the led number plates lights are in the black plastic (have a look at it and drill where you think the water would fall to and drill a hole there) and after carefully put nail varnish on the wires on and around it so if there’s water getting in can get straight out and not sit there causing immediate damage, even if water gets there from a jetwash it will still drain out).

Also after that if water from this was getting the actual boot then dry it as much as you can, especially if it’s around the battery, carefully put towels and paper towels in it (not on the actual battery!) for a week after to dry it/ see if the work on cleaning the drains and drilling the small holes has worked).

But you should then find out where the water is coming in and sort that for the long term! (It’s probably coming in from the spoiler seal somewhere) so needs sealant/to be resealed.

If your car doesn’t have a reverse cam then if you buy a new light fitting (pointless until you sort the leak = either properly or as I said above with the drilling of small holes) then you need the updated part number of 8S0827574B9B9 (again this is the non camera version).
If your car does have a cam at the time of posting this the updated version is 8S0827574C9B9

See my reply on the below too although there are lots of posts on this issue:


FYI if you do want to remove the light fitting see link below


 
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