Those seat switches are a bunch of ball bearings that make contact to
actuate the seat motor. Do the motors work and if so are the seats moving?
If the switches don't work but are in the"on" position they could be sucking your battery dry, but the seats should only work when the door is open or the car is "on"

So if the seat motors work and your seats aren't moving but the battery is dying I'd guess your relay needs to be changed.

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1991 190E 311K [Brilliant Silver/Black MBTEx] -retired
1996 E300 315K [Black/Grey MBTex]

Want to put a tank in the trunk for WVO/SVO in the E300 Need to find a place to store my OIL!
Still procrastinating about the biodiesel/WVO
Made some biodiesel but so afraid to pour it all in - I've added some and think I'll supplement my fuel to see how I make out

Made some biodiesel but the process scares me - methanol fumes are not your friend! Need to do this outside.