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Mk2 Convertible Top Problem - Defective F171 / F202 Hall Sensors

19K views 70 replies 7 participants last post by  Jezzie  
#1 ·
Hi,

I've read through the battery replacement KB but I'm still a little confused so I just wanted to check.
My car doesn't appear to have the battery module from what I can see (2008 roadster). The battery I fitted (the only one halfords listed as being compatible) is 5Ah higher than the original. Do I need to do anything or not?
I believe the battery was the original which is surprising for the age of the car. It wasn't dead and started fine, but on its way out so I replaced before getting stranded. Pics of old and new.

My other query is with the roof. I've ALWAYS had intermittent issues with it. Luckily I have vagcom to keep reprogramming it. i actually keep a laptop in the boot for this very purpose! It mostly relates to the right flap motor. I have followed the guide and cleaned the contacts until it was shiny new but it wasn't long before the issue returned. Recently it was also showing low voltage errors which is part of the reason I replaced the battery. Rather than the typical issue of the flaps opening but roof not raising, it would get almost to the top and stop.
Since putting in the new battery the roof still isn't working. I've cleared the codes and tried to run the flap initialisation but even when running this sequence it now fails to open. It's coming up with:

02000 - Switch Position
008 - Implausible Signal - Intermittent

On the odd occasion it will open but it takes a lot of clearing codes, turning the engine off/on etc. I've given up for tonight as it's refusing to budge. I managed to open it only once since fitting the new battery but not whilst running the initialisation.
If I'm now ONLY getting this code, could it still be the flap causing the issue or is there actually a switch somewhere at fault?
Last week the roof went all the way up but the latch lock failed to move into the open position to then be able to close and lock onto the frame if that's any help? I had to do a few resets and when opening the roof, the lock opened so then I could close the roof again and get it to latch.
I'm too scared to manually unlock/lock the roof after shearing the tool off inside the cog on my last TT when the same issue occurred.

Thanks,
Nick
 

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#28 ·
I probably won't have an update for you until next week.

When I dropped it off they asked to keep it a while to keep testing and make sure it's resolved until I have it back. I'm not free til next weds so it will be after then.

Bobbobb: unless I read your message incorrectly, I also don't see the roof module in VCDS if I go straight to it. For some reason on mine it's only available after I complete a full dtc scan and then address 26 is visible to access and run the adaption.

Nick
 
#29 ·
Still no update I'm afraid.

Indie hasn't managed to get to the bottom of it. They're currently waiting for the results from a test report to come back. Slight possibility it could be the roof control unit but I'm hoping not!

At least if they're struggling, we know it's not an easy fix we missed…..

Nick
 
#31 ·
chestnutree said:
Still no update I'm afraid.

Indie hasn't managed to get to the bottom of it. They're currently waiting for the results from a test report to come back. Slight possibility it could be the roof control unit but I'm hoping not!

At least if they're struggling, we know it's not an easy fix we missed…..

Nick
mine was the roof control module apparently the B series had relay problems and i ended up buying a D plugged in no coding nothing vagcom reconised it and roof worked straight away,

if you near me ill let you plug mine into your car and see if it works before spending ÂŁ100 on ebay
 
#32 ·
chestnutree said:
Still no update I'm afraid.

Indie hasn't managed to get to the bottom of it. They're currently waiting for the results from a test report to come back. Slight possibility it could be the roof control unit but I'm hoping not!

At least if they're struggling, we know it's not an easy fix we missed…..

Nick
mine was the roof control module apparently the B series had relay problems and i ended up buying a D plugged in no coding nothing vagcom reconised it and roof worked straight away,

if you near me ill let you plug mine into your car and see if it works before spending ÂŁ100 on ebay
 
#33 ·
Appreciate the offer, but I'm south Warwickshire.

Although ÂŁ100 is still ÂŁ100, it's better than I expected! Garage also said they'd source one second hand if it was that which needed replacing to save a bit of money.

Cheers
Nick
 
#39 ·
So, I'm definitely a 8J7959255B - rather than a D, so keen to see if chestnutree replace works before shelling out 100 notes on a new one.

Bobbobb - what were your symptoms that led you to replace the control unit - it you have the same as me and Chestnut, the roof would error (lots), then retract ok, then close and hit the roof claws on the roof (as they failed to open).

I think I also saw a E version of the controller on one page (8J7959255E), but it doesn't seem readily available for purchase. Any other pointers that the trusted ebay for parts welcome.
 
#40 ·
swiss jet helped me out a lot. i was having issues where roof went nearly up got stuck and i had to close by hand then error saying roof motor and i cleaned the servos but i could not run the adaptation, i tested motor ran ok then tried another motor
but still the same, checked whole mech and swapped that but still the same so changed roof switch still the same, i took the control module out looked inside and the relays had no top on and smelt a little burned so replace module and worked straight away no configuring to car or anything. i rang tps and they quoted silly price but did say the B had had this sort of problem.

heres a item the same and this is also guy i got it off

274458101956 on ebay

hope this helps
 
#45 ·
So decided to just go for it and buy another roof control module for ÂŁ85 off ebay. Basically, no difference. Still flashing light, and movement.

Going into winter not a problem apart from when I hit 30 mph and the dash tells me roof not secure but it clearly is as manually locked it. So next step is the switches in the roof latch that confirm it is shut as that could be the cause. I know I can buy the full assembly but does anyone know it you can just buy the micro switches?

Thanks

Col
 
#47 ·
You can buy the micro-switches, but you'll have to get the component they're connected to from eBay and remove them yourself. As far as I know, Audi does not sell the switches as individual parts, as they are a piece-part to an assembly just like a contact switches would be in the door lock assembly.

Follow the link below and check out page 13. Then scroll down the page near the bottom. I have posted a series of Roadster top components that show the micro switches. All of these images came off parts for sale on eBay.

 
#49 ·
Hi,
Apologies for the absence from this post. For some reason i've stopped receiving e-mail notifications when there's a response.
I've just called the garage for an update. They also tried fitting a new control unit for the issue to still persist. They still don't appear to be too confident on what the issue may be but they're now looking at the lock motor being at fault. Potentially overheating and then staying in this position? They want to run more tests before ordering one as apparently they're quite expensive. Great! :D
 
#50 ·
@ chestnutree - So this garage is proceeding with no fault codes?? Interesting. If the motor was faulting, I'm pretty sure there would be a DTC to let you know. Sounds like these guys are just guessing at this point. There's not really that many parts that can go wrong; Controller, Latch motor and Hydraulic pump. That's pretty much it. If any of the switches failed, an OBDII scan would show the fault.

If you're not in a hurry, you might want to hold off and try to find one on eBay. I paid 30-Euro earlier this year for one as a spare. They're a bit difficult to find, but every now and then someone parts out a top.

Image
 
#51 ·
Another update but not good news i'm afraid.

The garage have exhausted all avenues and have sadly had to admit defeat with this one. They haven't changed the roof motor so i guess this still stands as a possibility but they just can't work it out. So, turning the tables, if @Colsim_1 fixes his i'd love to know what the resolution was :) Or if anyone else out there may know? Slightly annoying after spending so much money replacing the hydraulic pipes only a few months earlier and i now still can't use it.

On the plus side, they haven't charged me any labour at all even though they've spent hours on it which is good of them.