There should be a bump in the back of the seat. Press the button and lift. May take a little finesse but it should come off.
On my 1984 190E, it is simple - there are a couple of tabs at the bottom of the back seat (where your heels would be if you were sittng), you have to look, the seat will pull right out!
The motors are underneath the seats
yes and there should be access to under the passnger seat or in trunk
you can get from here http://www.customcovers.com/Car-Seat-Covers.aspx. http://www.seatcoverset.com/seatcovers-car_seat_cover.htm
same here
Yes. You pull up on the buttons on the top of the seat back(next to the head-rest) to let the seat fold forward.
There is button that you push in that is located at the top of each seat at the base of the head rest. You push the button in to make the head rest go up and down.
Its on the door panel next to the door handle. at least that's where it is on my 1992 190e 2.3
First tilt the seat back toward the rear to allow more room for head rest removal. The headrests have two small plastic covers on the seat. When sitting in the back seat behind the headrest, push in the adjust tab and raise the head rest up as far as it will go. Next push a jeweler's screwdriver or small drill bit into the hole on the right side cover. As you push the screwcriver into the hole, move the headrest up then you can easily remove it.
To remove the head rest, lift the head rest all the way up. At the top of the seat, not the head rest, there are 2 plastic pieces that surround the post. On the inner side there are 2 little buttons that you have to push in, one for each post. to release the head rest. Push these both in at the same time and pull the head rest up and out. Yes, you can purchase just the seat belt guides from any GM dealer, they are about $8.00 each. The guides are held on by little metal O-Rings, which can be removed with needle nose pliers and a small flat screw driver or a pic tool. Work them down, inch by inch on each side or you can just cut them off with side cutters but you will have to buy new O-Rings to re-install the guide. By the way, the reason I know the above information is because I recently had to replace one on my 2004 Monte Carlo SS
press the button on the base of the head rest (one of the plastic mounts has a button), while holding the button in, pull the head rest up out of the seat. To reinstall, do the reverse.
It's probably the switch.