I have an Audi TT coupe (2005) and the front interior light is intermittent

When it's working correctly (and the light switches are in their middle positions), the main centre light and two map reading lights automatically come on when I unlock the car. And the lights continue to stay on for a couple of minutes, or until I start the car.

Similarly, the main centre light and two map reading lights automatically come on when I turn off the ignition. And the lights continue to stay on for a couple of minutes, or until I lock the car.

However, after a few days, none of the lights come on automatically when I unlock the car, or turn off the ignition. Furthermore, only the two map reading lights work when they are switched on manually, and the main centre light will not work at all!

After a few more days, the interior lights start working again. Does anyone have any suggestions?

BTW, I haven't been able to find a wiring diagram for the coupe, but I have found a wiring diagram for a TT Roadster, which I suspect is similar. The URL is http://130.74.178.25:85/newsletter/r...rAT/wiring.pdf (sorry 453k is too big to attach to this thread). Page 8 shows the wiring for the interior lights, but it doesn't really help me.

After looking at the wiring diagram again, I think the centre switch is faulty. I eventually managed to get the interior light out without breaking it, but I couldn't repair it. I ended up replacing the whole unit, which seems to have fixed the fault

Originally Posted by Simn

After looking at the wiring diagram again, I think the centre switch is faulty. I eventually managed to get the interior light out without breaking it, but I couldn't repair it. I ended up replacing the whole unit, which seems to have fixed the fault

Hello simn, welcome to Audi Forum,

Glad to hear that you managed to replace the entire unit and fix the problem. Hope you don't get any issues with your TT anymore. Have fun driving your Audi TT.

If you like you can upload a picture of your Audi TT to your album here on go-audi. (http://www.go-audi.com/album.php)

Best Regards
R.B.N.J

i just had the same problem last night... looking for a solution that wont cost hundreds of dollars...

Originally Posted by Simn

After looking at the wiring diagram again, I think the centre switch is faulty. I eventually managed to get the interior light out without breaking it, but I couldn't repair it. I ended up replacing the whole unit, which seems to have fixed the fault

what "unit" exactly did you replace?

... because i was told by the dealer it could either be due to corrosion somewhere or the Central Locking Control Unit ($439.95)

I replaced the interior light unit.

hm interesting... i might have to look into that. p/n? $?

I had the same problem and eventually worked out that the switch was faulty / intermittent - please see my thread 'Audi TT Intermittent front interior light problem' for further details.

I tried to get one from a salvage yard, but nobody had one in stock so I ordered one from my local Audi dealer. It cost about £45 and arrived in about 2 days. No idea what the p/n is, but it will depend on the colour of your interior.