minomimo

Hi all,
i have w220 320cdi 2004 before facelift and i have this problem:

Driver seat move front, but not back. If i try move back, fuse is automatically blown (under back seat).
I bought new panel inside driver door, but this no resolve my problem. I dont see any trash in rails. Now driver seat is front and i cant drive.

help?

streborx

Have you checked for loose wiring and a possible pinched wire underneath the seat?

wallyp

As a general rule, DC (direct current) motors reverse by swapping power and ground. That is, to move rearwards, power is placed on one wire and ground on the other wire to the motor. To go forwards, the switch reverses the wires - the one that was power is now ground, the one that was ground is now power. Sounds as if one of your wires is now accidentally grounded to the body all the time. When going forward, the wire that is supposed to be grounded by the switch is hard-grounded, and the other wire gets power, and the motor works. When going back, the switch applies power to the hard-grounded wire, and the fuse blows. Check the wires between the switch and the seat motor, and see if one of them is hard-grounded.

BTW - the "facelift" happened in 2003, so any 2004 should be "after facelift".

streborx

Too simple! German engineers included a mini-automatic transmission with forward and reverse, and a solenoid that drives the shift lever (lol).

wallyp

Then that solenoid or the wires to it would seem to become the prime suspects.