How to remove/install seats on 1999 Audi A6

on the lower front of the lower part of the seat directly behind the drivers seat you must push in and pull up to un clip it then the passenger side then remove the back portion of the seat has some bolts one on each side on the bottom.

you will need to determine WHY it came off in the first place. belts just dont fly off for no reason. you may be better to find a shop that does euro work and is familiar with audi.

UNDER BACK SEAT

Hi, I know it's a long time since you posted, so I do not know if you are still following this. Anyway, I've got the same model car, and similar problem. Just wondering if you ever got yours sorted?

It's under the rear seat on the right side of the car. Pull the two phillips screws at the front lower edge of the rear seat bench and lift the seat out from the front edge and then out. The battery is held down with a 13mm bolt and tall bracket. Cables are 10mm nuts.

You need to access bolts that are bolted to the floor, disconnect wiring, move the seat forward and look from the rear seat down under, you will see bolts..

The rear seat pulls out easily.  Grab the front of the seat with fingers under seat on driver side and pull up hard.  do the same on the passenger side and it will unclip.  Then you can move the seat around to get to the buckle.  Install by inserting rear end in first and lineing up the metal tabs w/ the female plastic inserts in the floor and push down hard until it snaps into place.

This is a common problem with the C5 A6 models. Before you replace the fuse for the windows (I think it's number 14, but i don't have a manual in front of me - Anyway, it's the 10A fuse that's blown!) Look under the back of both front seats and you'll see a light that illuminates the floor for the back seats. Rem ove the light from each seat by prying it out with a flat screwdriver and disconnect both leads. Replace the fuse, and your windows (moon roof and interior lights as well) should now work. The lumbar support causes something to short out the lights. I've tried insulating the lights on mine, but the problem always comes back so I just disconnected them altogether.

I HAVE THE AVANT WAGON. THE SUBWOOFER AND AMP IS LOCATED IN THE PASSENGER SIDE REAR FENDER COMPARTMENT.

I have a 535i 1991. Now, mine is (and most are) under the passenger seat. If you can't find it in the engine... always look under seats... also the same in my old VW.