What is the box under my driver seat with gain control on it for

No sure about you car, but many times they are under the seat in a holder or a control box.

On my vehicle there are two fuse boxes one at your feet on the drivers side and one under the hood on the drivers side both are covered by plastic covers hope this helps Merry Christmas

Not likely any reset button. If both seats have stopped working it must be some power problem I would think. There is a control unit under the seats but I think there are two, one for driver and one for passenger. Change the fuse anyway, make sure you have the right one.

There are 2 fuse boxes..

first one is under the hood on the driver side (black cover )

second one is under the driver's side second row seat (tilt the seat forward and you'll find it (black cover)

There are 2 fuse boxes, they are called Bussed Electrical Centers.
The front Bussed Electrical
Center (This is one fuse box) is located in
the front of the engine
compartment on the
passenger’s side. Lift the
cover to gain access

Rear Underseat Bussed Electrical Center (BEC)
The rear BEC is located
beneath the rear seat on the
driver’s side. The rear seat
cushion must be removed to
access the BEC. See
“Removing the Rear Seat
Cushion” in the Index.

Check your fuses first. Then check to see if you have power to the box under seat. It should be about 3x3 and black I think. If you have power to the box change the box. To check use a test light. make sure the key is on and the button is pushed then probe the wires going to the box. Hope this helps you.

I'm not finding a relay that controls the heated seats (this doesn't mean there isn't one), but I did find a Climate control seat module which is under each seat. There may be a "multi-function" relay that controls the seat and other things, most likely located under the hood in a black box containing other relays and fuses, the lid should have a diagram that tells you what each one controls.

There are 2 fuse boxes..
first one is under the hood on the driver side (black cover )
second one is under the driver's side second row seat (tilt the seat forward and you'll find it (black cover

Under the rear seat, drivers side.
Black box you will need to remove the cover.
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Hello, nothing to my knowledge is factory. After market music AMP or security system? Any markings remaining on box? Perhaps followings wire down to where it goes could be of help. Does the car still run okay?