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There is a small diode in the fuse box that allows the seats to operate with door open & key off. The diode is there to keep current flow from battery power with key off from feeding into key-on circuit, seat operation with door closed & key on. Sounds like this diode has "shorted" & is allowing current flow in the wrong direction. Small grey or black 2-pin plug in plastic device in the relay section of fuse box! Try un-plugging & see what happens!
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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
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