I know exactly how you feel! Electrical problems are a real nightmare. I've been kept busy by a few on my car..

A battery reset is obviously resetting all the control modules (ecu et al). Usage, on the other hand, is causing an excess load that makes a control module switch things off. There's a K40 module in the ecu box in the engine bay that is normally associated with these controls - you could check if all connections, etc are fine on it.

There's also a control unit under the rear seat (left side) that operates these things (minus the wipers). You could check the connections on it. However, you mention its only the front seats, doors, etc that have this problem(?). That may well mean a wire going from this module to the front of the cabin.

I'm sure its a loose/corroded connection somewhere along this link. Do you have the fuse box under/side of the dash on driver side? That normally houses various fuses for these functions. The loose or corroded connection might be close to this box.

hello

i have same problem
any one found solution ?!

thanks

With ANY MB electrical issue Id start by replacing all the fuses with ones with copper/bronze element ones. Clean the fuse box connections too.

Interstate blem batterys are proven to be long life and they are cheep.

Passenger side kick panel is the Can bus bar where all the body modules connect there,s like 9-10 wires connected to a bar. On my 2000 W210 the passenger seat module was bad so just left that wire disconnected its been over 2 years now all is good except that seat doesn't work don't want to spend money for new module at least the driver one works now. There's a way to test each module just do some research "W210 CAN bus problems".. On some other threads I read it was common for RR window motor. Hope this helps

thanks all
i will try and tell you about

thanks