Front seat Motor Problem - Mercedes-Benz Forum
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#1 (permalink) Old 06-27-2010, 02:32 PM
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Front seat Motor Problem

I have a torn seat back so I'm removing the Driver's front seat.

One of my rear "raise" motors is not working. Are there anythings to look for, or just replace it? It looks like a belcrank/gear design. One side raises and the other side doesn't.
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#2 (permalink) Old 06-27-2010, 03:54 PM
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Are you absolutely sure its the motor? Motor failure is rare -- seat switch failure is not.
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#3 (permalink) Old 06-27-2010, 03:58 PM
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Are you absolutely sure its the motor? Motor failure is rare -- seat switch failure is not.
Yeah, gotcha.

The thing is that when I actuate the switch, one side raises and the other side does not.
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#4 (permalink) Old 06-27-2010, 04:14 PM
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Doesn't matter. The front contacts can be good and the back contacts bad. Not uncommon.

You need to unplug the switch and jumper the harness terminals to see if the motor works. Need wire colors?
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#5 (permalink) Old 06-27-2010, 06:20 PM
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Doesn't matter. The front contacts can be good and the back contacts bad. Not uncommon.

You need to unplug the switch and jumper the harness terminals to see if the motor works. Need wire colors?
Hi,
Yeah, colors would be awesome.

So the left rear works for me but the right rear doesn't. Kinda made getting the seat out a B*ITCH!
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#6 (permalink) Old 06-29-2010, 12:01 PM
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Yeah same thing with my passenger seat back motor didn't work turned out it was the switch was not hard to fix
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#7 (permalink) Old 06-29-2010, 12:04 PM
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Yeah same thing with my passenger seat back motor didn't work turned out it was the switch was not hard to fix
Good News then! Only one side was working for you as well?
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#8 (permalink) Old 06-29-2010, 01:01 PM
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Good News then! Only one side was working for you as well?
yea was an easy fix just opened the switch up and cleaned all the metal contact
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#9 (permalink) Old 06-29-2010, 03:22 PM
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yea was an easy fix just opened the switch up and cleaned all the metal contact
Thanx, I have some Cramolyn R5 that should suite this perfectly.
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#10 (permalink) Old 06-29-2010, 07:42 PM
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Not sure if the switch will do it, but give it a try.

I had the same problem with mine the other day. One side of the drivers side would go up and the other would bind.

Both sides are driven by the same motor (why I don't think the switch will fix it). The motor has a drive cable coming out either side. One cable goes to one side and the other opposite. What fixed it for me was to move the seat all the way forward so I could get good access to the gear drive mechanism (on the broken side obviously). Gently yank the black plastic covers off that cover the tilt mechanism. Remove the four screws that hold the cover on and you will see a worm gear that drives a large plastic gear for the tilt. Take a slot screwdriver and gently pry out the worm gear. You will find a rough square cable protruding from the cable drive. This is supposed to slip into the worm gear to drive it.

In my case the cable had worked its way too far out at the other end and no longer "plugged" into the motor. Thus no drive. After a couple of attempts to reposition it and reassemble, it would simply keep working its way out.

In the end I positioned the cable half way into the motor and half way into the worm gear. Only this time I added JB Weld to the end of the cable before I inserted it into the worm gear. I carefully reassembled so as not to move the cable out of position and resisted the urge to try it out till the next day. All was well and it has worked ever since.

Note: There is a DIY on this but that person had a stripped worm gear. Ultimately a similar solution.

Good luck.

-Derek
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