Power seat problem - Mercedes Benz SLK Forum

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#1 Old 05-07-2010
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Power seat problem

Hi all,
I just picked up my 2002 yellow SLK 320 yesterday and it appears that I missed testing one thing. The driver seat will not tilt down in the front.
All other motions (and the other seat) work fine. It also appears that up works although it's all the way up now. You can hear the motor click when you push the switch up in the front but the switch won't move down. It seems like a mechanical problem with the switch.

It's not a big deal as the seat is comfortable where it is but, I'd like to have a look at it. Any advice? I expect I'll need to remove the seat to get at the switch.

Thanks,
Steve
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#2 Old 08-21-2010
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Power Seat Problem

I have the same basic problem with the passenger seat in my 2001 SLK 320. When I bought the car I pointed out that the passenger seat would move fore and aft and the backrest would recline but the seat height adjustment would not work (it is in the down position). The dealership told me it was a burned out motor (they reached this conclusion by claiming they put a motor from another car in mine and it worked fine). Well I bought the proper sockets to remove the seat and installed the new motor assembly but I have the same problem. I too believe it is a switch problem, but now I find you can't just buy a replacement switch and that you have to buy the entire seat bottom, part #17082026107C45 or 17082026109B51 which runs between $400 to $550 depending on where you get the part. I'm just not sure I want to invest the funds to be able to raise the seat higher!
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#3 Old 08-28-2010
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I fixed my problem! Visually checked the relay in the dash and it seemed OK so proceeded to remove the seat again, unpluged all the electricals and took off the side panel where the switches are located. Opened the switch compartment and sprayed electrical contact cleaner and lube on all the switch springs. Closed the compartment and sprayed the male and female electrical connectors before reassembly. Checked out the power seat functions before remounting the seat....and it worked perfectly! Saved about $450 and hope it is a lasting fix to my problem.
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#4 Old 09-01-2010
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I have had a similar problem and solved by cleaning the switches. I should have taken pictures and if this ever happens again I will. Here's what I did.

Pull the seat, unlug all the wiring. Uncscrew and pull off the seat side panel to get access to the switches. Remove the screws holding the switch block to the side panel and separate. I then unscrewed the main connection bracket so I could remove the harness from the seat area and work on it on my bench.

On the front side of the switch block the 4 swiches are covered by grey covers, 1 for the recliner and 1 for the other three. My problem was with the fron seat riser so I pulled off the cover covering the three switches. This exposes the switch mechanisms. I then removed the toggle for the non working switch by prying aside the clips securing the toggle and lifting it out. Careful here as yours might have loose springs though in mine they were all captive. You can now access the switch contacts. Note how they are fitted. Lift out the moving part of the contacts so you can see the contact area. In mine they were black and oily and also rather pitted. I cleaned them and added just a fraction more bend in the contact arms, not too much or they will not move correctly and you could end up with a short. Reassembled everything works just fine. You need to be careful putting it all back together to make sure the big switch levers mate up correctly with the switches, try them to make sure you can feel the switch action before putting it all back together.

You can check the switch action with a multimeter. If I recall correctly the two switch commons go to the motor then when operated in one direction it switches + volts to one common whilst leaving the other common connected to - Switching in the other direction puts + on the other switch common leaving the first common at - When at rest both commons are connected to -.

Provided you are careful the switches can be cleaned and rebuilt Mine have worked for months now and seem fine. It would seem that perhaps the mottor current is a little more than the switches were designed for and this is or the motor back emf is what is causing the pitting of the contacts.

YMMV, I rpovide this info as is and without warranty of any kind. Hope you find it useful.

Regards
Martin
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#5 Old 03-17-2011
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No fore-aft movement

My fore-aft switch seems to have failed, with seat in forwards position. The motor became hot so I've now removed the fuse.

I can move the seat up/down, and change the seat angle; but not forwards/backwards.

Can I remove the switch with the seat in place?

Or how can I remove the seat (whole seat, or just the lower part)?

Thx for any help.

Anthony (2002 SLK 230)
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#6 Old 03-18-2011
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Workshop Manual

Has anyone purchased this workshop manual: http://www.emanualonline.com/Cars/Me...op-Manual.html

If anyone can recommend purchasing (based on info on how to remove seat, switches, motor etc), I'd be happy to purchase.

Any help on this or previous thread appreciated.

thanks

Anthony
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#7 Old 03-19-2011
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Removal of seat squab

Hi

Does anyone have any ideas on removal of seat squab with the seat in situ?

Thx

Anthony
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#8 Old 10-12-2012
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Hi Anthony

I know these questions where asked a long time ago but did you get the answers you wanted ??

I also have a problem with the seat switch on my year 2000 SLK 230

I pulled the plastic cover off the seat switch and I can see the three separate switches that do the work. The centre of the three moves the seat backwards and forwards but it seems to get stuck and needs to be lifted slightly in order to move it back and forth. So I suppose the switch needs to be replaced.

Is it possible to get a new switch
and can it be replaced without removing the entire seat ??

Regards
Healey
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#9 Old 10-12-2012
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Originally Posted by Healey View Post
Hi Anthony

I know these questions where asked a long time ago but did you get the answers you wanted ??

I also have a problem with the seat switch on my year 2000 SLK 230

I pulled the plastic cover off the seat switch and I can see the three separate switches that do the work. The centre of the three moves the seat backwards and forwards but it seems to get stuck and needs to be lifted slightly in order to move it back and forth. So I suppose the switch needs to be replaced.

Is it possible to get a new switch
and can it be replaced without removing the entire seat ??

Regards
Healey
I went through the same thing awhile back. Check out the last post in this thread. Pretty easy fix. Everything is still working great.
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#10 Old 10-13-2012
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Hi MrG

Thanks for the information

I will give this a try in a few weeks time

I am recovering from an operation at the moment so I can only do the planning, rather than the actual work.

Soon I will have a working seat though !

Thanks again

Healey
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#11 Old 10-17-2012
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Hi MrG

I just have another quick question if you don't mind.

I have a feeling that there may be some additional damage to the switch which I may not be able to fix with the method you described.

Assuming that is the case, would it be possible to exchange the drivers side switch with the one on the passenger side ???

Are the switches "handed" ?? Would it work ??

The idea being that the passenger side is not so important.

Thanks in advance

Healey
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#12 Old 10-17-2012
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I'm guessing the switch boxes are 'handed' but I haven't been into the passenger side to confirm. I'd bet you could swap out the individual switches inside the boxes though. That's an interesting idea.
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#13 Old 10-18-2012
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Hi

Yes - Thats what I thought

Good idea of yours on changing the individual switches !

At least that gives me a "Plan B" if all else fails.

Will see in a few weeks time

Thanks

Healey
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#14 Old 03-14-2013
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Question Intermittent Power Seat Problem

Just wondered if anyone has ever experienced a problem with the power to both seats going out intermittently. This makes troubleshooting a good bit more difficult. I'm going to assume that because the power seat motors draw a rather significant amount of current, the circuit would be protected by a circuit breaker, rather than a fuse - so my first step would probably be to check the contacts of the circuit breaker - If I can locate it.
At 5'2", my wife drives with the seat positioned nearly all the way forward. When there is no power to the seats, I can't even get into the car.
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#15 Old 03-14-2013
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Originally Posted by Rob7412 View Post
Just wondered if anyone has ever experienced a problem with the power to both seats going out intermittently. This makes troubleshooting a good bit more difficult. I'm going to assume that because the power seat motors draw a rather significant amount of current, the circuit would be protected by a circuit breaker, rather than a fuse - so my first step would probably be to check the contacts of the circuit breaker - If I can locate it.
At 5'2", my wife drives with the seat positioned nearly all the way forward. When there is no power to the seats, I can't even get into the car.
Here you go! Check out this thread. If it's intermittent then it's most likely the relay! I had the same issues as you do now =)
https://www.slkworld.com/slk-r170-cla...relay-fix.html
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#16 Old 03-14-2013
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Thanks - that should help ! - I'll let you know for sure. Really appreciate the quick reply.
That is especially suspect as I recently replaced the break light switch - in nearly the same area as the relay in your photos.

Rob
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#17 Old 03-14-2013
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Originally Posted by Rob7412 View Post
Thanks - that should help ! - I'll let you know for sure. Really appreciate the quick reply.

Rob
Definitely keep us updated! Glad I was to help!
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#18 Old 03-18-2013
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Jayson, I sent a reply - along with many thanks - to your original post : https://www.slkworld.com/slk-r170-cla...relay-fix.html

Guess I need to spend more time on this site to become more familiar with the mechanics of searching and posting threads.

Thanks again, Rob
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