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Old 08-06-2001, 09:09 PM
Jeff R
Posts: n/a
power seat won't move forward

1990 300SE--All of a sudden, the passenger seat won't move forward. Moves in every other direction, (including head rest), but get nothing when moving switch forward.

Seems like the switch on the door is the first place to check--but looking for advice.

If I need to get to the back of the switch on the door, how do I do it?
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Old 08-07-2001, 10:24 PM
Senior Member
Join Date: Apr 2001
Location: Beech Island, S.C.
Posts: 468
Some models you can take the trim from around the switch and see the two phillips head screws and just remove them and remove the switch. Otherwise you will have to remove the door panel. I have seen where the car was sent to a detail shop and the plug underneath the seat was knocked off by a vacuum cleaner wand. I spent two hours of my life searching to the problem before I found what was wrong. Hope this helps.

Last edited by Stan Pittman; 03-07-2002 at 12:02 AM.
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Old 08-08-2001, 12:10 AM
Posts: n/a
I just had this problem to. there are 2 seat fuses under the hood
sometimes 1 blows and 1 is good. Good luck.
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Old 08-08-2001, 04:55 PM
MBenzNL's Avatar
Join Date: Jan 2001
Location: the Netherlands
Posts: 1,417
There are 2 fuses per seat indeed...1 might be blown.

On my 300SL I have the same problem...sometimes my seat doesn't slide forwards/backwards...the problem in the SL is caused by the seat computer/regulator.
Although the W140 and R129 share a lot of parts, I am not sure whether your W140 has an additional computer for the seat adjustment.

1990 300SL-24
1993 C250D
with a minor 600+k kilometer
(the Netherlands)
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Old 08-08-2001, 05:44 PM
Michael's Avatar
Join Date: Jul 1999
Location: CT, USA
Posts: 2,699
I'd try squirting a shot of WD-40 into the slot behind the offending knob...if you can get the liquid into the switch, it'll likely make the switch work for a while. I somehow got an extra year or so out of a seat switch that way.

Good luck!
"If everything seems under control, you're simply not going fast enough" --Mario Andretti

1995 E500 street car
1986 Porsche 944 Turbo S track car
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