Power seat base tilt working on one side only - Mercedes-Benz Forum
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#1 (permalink) Old 06-19-2010, 01:09 PM
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Power seat base tilt working on one side only

So the drivers side seat base (where your bum goes) is only tilting on the outside. The center side seems to jam. Does this unit have two motors? Could one be dead? I haven't ripped it apart, just peered nervously underneath.
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#2 (permalink) Old 06-19-2010, 06:52 PM
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Just one motor for each function. A cable exits both ends of the motor to power each side mechanism. Check for coins, paper clips, etc. that get dropped and jam the mechanism.
If more than a cable is broken I'd find a used seat in a salvage yard ans swap out your regulator. You *can* work on the regulator but it's not easy or fun. A lot less offort to swap the whole regulator...
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#3 (permalink) Old 06-19-2010, 07:43 PM
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I have this same problem, and from doing a few searches, it seems like it is not an uncommon problem. Someone did a write up on repairing it on the forum somewhere.
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#4 (permalink) Old 06-20-2010, 05:49 AM
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Thanks guys, I'll try to yank the seat out in the upcoming week and have a look. That is, if there is no coinage in the mechanism that I can find.

Cheers.
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#5 (permalink) Old 07-14-2010, 02:16 PM
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I'm going to jump onto this thread because I have the problem described in the title. My issue is not the Switch though.

I have the seat apart. I can put 12v to the seat and one side will raise and lower, this is the drivers seat, and the inside rear will not raise up and down.

I can feel the drive on that actuator vibrating, so I pulled the cover off. The square drive cable is turning, but the worm gear is not. Here's a PIC:

PIC

It almost looks like the cable isn't engaged maybe? I can't see if it goes in the worm or not.

Any suggestions about what to look at next?

EDIT: OK, pulled off the motor end of the cable and was able to advance the cable into the worm and it works. The cable is in perfect condition. What would allow the cable to back out of the worm just enough to not work?

Last edited by Les_Garten; 07-14-2010 at 03:03 PM.
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#6 (permalink) Old 07-14-2010, 05:12 PM
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Looks like I fixed my issue.

After taking loose the cable on the motor end and seeing that a drill would drive the actuator. I examined the cable and it was perfect. So it seems that my cable was not engaged enough in the worm drive. I put it all back together making sure everything was tight and no more problems. Strange!
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#7 (permalink) Old 07-19-2010, 06:54 AM
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I fixed mine as well. It had exactly the same issue. Only, the cable worked its way loose after a couple of days, so I put some JB Weld on the end and insert it into the worm gear again. It hasn't come loose yet and it has been in there a couple of weeks. Time will tell if it will hold.
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#8 (permalink) Old 07-19-2010, 10:38 AM
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Quote:
Originally Posted by biffidum View Post
I fixed mine as well. It had exactly the same issue. Only, the cable worked its way loose after a couple of days, so I put some JB Weld on the end and insert it into the worm gear again. It hasn't come loose yet and it has been in there a couple of weeks. Time will tell if it will hold.
Yeah, I'm worrying mine will be back.

Did you just "build up" the end with JB weld?
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#9 (permalink) Old 07-19-2010, 06:49 PM
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The cable is a wire wound type that is pressed square to fit into a square receptacle. I just cleaned out the worm gear receptacle and degreased the cable end and then smeared JB weld on the end. I guess I figured the wires would provide enough friction for the epoxy to get a grip

I had practiced putting the cable in a few times so I knew how far in could go without pulling it out from the motor end. I then inserted the cable and carefully put it all back together.
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#10 (permalink) Old 07-19-2010, 08:21 PM
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Did you guys have to remove the seat to do the fix?
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