Anyone able to help?
If not I'll just buy a whole new light unit and hope for the best

 

Hi Chris, Is it a conventional bulb or LED?
Dry solder joints in the light unit have been a problem & could also be a damaged cable/insulation in the door hinge rubber bellows.
Hoggy.

 

Hi Chris, Is it a conventional bulb or LED?
Dry solder joints in the light unit have been a problem & could also be a damaged cable/insulation in the door hinge rubber bellows.
Hoggy.

Cheers Hoggy.
That's interesting I thought the solder joint issue was only on the mk1-obviously applies to the mk2 also then?
Chris

 

Chris, you don't say age and mileage of your car.
If either are high then I'd say driver's door flexible rubber tube between A pillar and door (near hinge) is likely culprit as wires work-harden over time, become brittle and can break (as Hoggy suggests).
With light expected to be on try swinging door and/or squeezing rubber tube when door open. If light flickers you will have your answer.

 

Chris, you don't say age and mileage of your car.
If either are high then I'd say driver's door flexible rubber tube between A pillar and door (near hinge) is likely culprit as wires work-harden over time, become brittle and can break (as Hoggy suggests).
With light expected to be on try swinging door and/or squeezing rubber tube when door open. If light flickers you will have your answer.

Its an '07 plate coupe with 76k. So not particularly high miles but I suppose its not that young anymore.
I'll give wires a check as you mention tomorrow, thanks for that.
Oh and Hoggy they're standard bulbs as far as I'm aware, not LED. The more yellow light colour would suggest so anyway.

Chris

 

No change/flickering if I provoke either side of the door wiring. So I suppose the next check is the light unit itself

 

Hi, I have a interior light glitch too, but not quite as bad but still annoying. I have a 2010 Mk2 TTRS just approaching 70k. My interior light works fine for a while, then doesn't come on when I open the door. It will come on if I push the button and then it will continue to work normally for a while then - deactivate itself again. Any body have any ideas why it keeps doing this? I've only have this car since June last year when I upgraded from my Mk1 and this model seems to have more issues...

 

I used to have an 07 TT with a similar problem. My fuse (15?) would regularly blow and I'd loose the map light. I bought a new map light and replaced it, but the issue didn't improve. I gave up in the end and bought a new car!

 

An OBD scan should be able to isolate the fault and point you in the right direction. It may only show an "implausable switch" fault, but at least you'd know for sure if it's the switch or maybe something else.

 

Anyone resolve this? My car seems to be doing the same after months of working as expected. The yellow light in the middle keeps extingushing and I've got to the point where i have to turn the interior light on manually each time, although it has no problem turning off. I've scanned the whole car for faults, none reported. DIS reporting drivers or passenger door open fine too... Hmmmm?

 

Do the lights come on after removing the key from the ignition?

It would help rule out the light unit or door wiring

I'd be very surprised if the passenger door wiring was the issue, especially at the same time as the driver door

Bear in mind that the light isn't actually wired to the doors, it's all through the central electric module

 

So I did some further investigation and diagnosis. With the ignition key in the on position, I could press the central button to turn on and off the auto interior light function as many times as I liked and that would appear to function as normal. As soon as a door was opened or the ignition key pulled out, rather than the interior light turning on, the central amber indicator would just turn off to indicate the auto on/off function was no longer active and no lights would turn on. With the amber indicator on, I then tried turning the turned the left and right interior lights on and off, one side at a time. I noticed that I could turn the driver's side light on and off as many times as I liked and the amber indicator would remain lit, however, as soon as I turned the passenger side light on the orange indicator would turn out immediately. So I pulled the interior light out using the below illustration and did some further diagnosis.

With the passenger light bulb removed the interior light now functions completely as it should, even the auto on and off works and remains doing so long term. I thought it might be the bulb, but after switching them the behaviour is still the same. For now, with the passenger side map light bulb removed, the interior light auto function is back to normal, but it looks like the electronics in the unit have failed on the passenger side.

I've also discovered this post:

https://www.ttforum.co.uk/forum/viewtopic.php?f=19&t=1862223&p=9084845&hilit=interior+light#p9084845

 

I can see that Audi have superceeded this light four times and the current part number is 8J0947140M which is £107 with the halogen bulbs, or 8J0947140L which is £110 for the one with LED's. Does anyone know if these are interchangeable, maybe I'll source an LED one...?

People think the part number is 8J0951177 but that is the part number sticker for the interior motion sensor unit that mounts on top of the interior light basic/base plate.

 

Here's a photo of the base/basic plate with the interior monitoring sensor removed. This is what costs £107, with no bulbs and no interior trim plate. Sadly it looks like the circuit board is plastic welded on, so I'm not sure I can be arsed to remove it to look for a broken solder joint. :? Might be onto flea bay for a fix.