Newbie here - Searched the site but didn't see any hits for this problem. I just purchased a 2001 audi a4 2.8 quattro with 122k on it. I arrived home from the dealership and turned the car off - removed the key - stepped out and locked the door. To my surprise the red interior illumination lights on the factory stereo all stayed on. I thought maybe they just took a minute to turn off so i waited - still on. I went inside and ate dinner and came back out an hour later - still on.
The only way i can get them to turn off is to pull the fuse. the red illumination lights around the a/c vents and the sun roof/overhead lights in the front and the rear stay on as well. Anyone have any suggestions/solutions or ever seen this before? For what it's worth it appears my tachometer doesn't work either. I also don't have the smart key with remote - just a regular key - not sure if that has anything to do with it. The windows and other electronics turn off (as they should) until the key is reinserted. It's just the red illumination lights - i swapped the fuse with another one but the problem persisted.

Appreciate any help or advice.

 

All those features are switched on/off by the ignition. Your switch is failing/shorting and not allowing that stuff to shut off. Replace it and you should be fine.