Help! My power seats are intermittent - Mercedes Benz SLK Forum

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#1 Old 10-01-2013
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Question Help! My power seats are intermittent

I have an 02 R170 (if you couldn't tell by my user name) and my power seats decide when they want to work and when they don't. I can't find any pattern to when the will or won't. What are the first things you would check?
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#2 Old 10-01-2013
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#3 Old 10-01-2013
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Hi there,

Your seats are fine and your fuse is fine. It's your power seat relay switch behind the dash that's the problem.

Do this: the next time your seats decide to go out, knock on your dash under the steering wheel a little, just give it a few good raps and try again. When the seat keeps moving you'll know for sure. I just had this issue a few months back and the indy showed me the path and diagram on the laptop when hooked up to my odb reader schematic.


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#4 Old 10-01-2013
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Originally Posted by my02'R170 View Post
I have an 02 R170 (if you couldn't tell by my user name) and my power seats decide when they want to work and when they don't. I can't find any pattern to when the will or won't. What are the first things you would check?
That's a common problem.
Check this thread for a DIY fix
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#5 Old 10-02-2013
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K40 seat relay ........

But you've known that now for 2 hours at least!
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#6 Old 10-02-2013
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yes,+1 the seat relay....new one about $30 or follow links and re-solder it.Worked for me (the soldering was done for $20 by the upholsterer who put in new heaters for total $100)
Heaters were $68 on ebay and work very well.
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#7 Old 10-03-2013
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Thanks everybody. I knew I could get some answers here. I'll check out this K40 thing.
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#8 Old 10-03-2013
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NOT the K40,but a small relay in the back of the dash,near steering column.
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#9 Old 10-03-2013
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Sorry you are right its just the 'seat relay' not the k40 module.
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#10 Old 10-05-2013
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Talking Hurray for the seat relay fix!

Thanks everybody for the responses to this thread. I did the relay fix and I'm back in business. The solder points inside the relay were smaller than the pictures made it look but the pics were accurate and EXTREMELY helpful.
Thanks again to all who posted.
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#11 Old 11-25-2014
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I was about to say K40? are y'all sure? I just soldered my k40 thingy trying to fix another problem and my seats were intermittent before and they still are. i'm about to click on the thread above to see what they say. I don't move my seats often but when I want to I want to be able to do so...nuisance
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#12 Old 11-25-2014
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Now that you're a soldering expert, I would take a look at the relay


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#13 Old 11-25-2014
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Now that you're a soldering expert, I would take a look at the relay
BAH LOL, I have way to much left over...hmm, I wonder if I can find something to solder in the kitchen while the FAM prep a feast tomorrow
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#14 Old 11-26-2014
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I was about to say K40? are y'all sure? I just soldered my k40 thingy trying to fix another problem and my seats were intermittent before and they still are. i'm about to click on the thread above to see what they say. I don't move my seats often but when I want to I want to be able to do so...nuisance
It's the seat relay, located under the dash =)
Make sure you solder connections thoroughly to avoid taking apart your dash again
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#15 Old 11-26-2014
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I hope I did..so far its holding up. they're so close I was afraid of touching the other points next to each other. works so far though THANKS!
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