kellykel74

I have a 2003 c320 4 matic. For the past two months the power seat on the driver side has been working intermittently. First the fore/aft (front back sliding motion)would not work. And sometimes using the control for the fore/aft would move the headrest only (??). All other controls would work for the seats, just not the fore/aft. Then the other day, my husband moved the control back and it magically worked- but then got stuck in that position and now I am unable to move it back to 'my' position. And to top it off, now NONE of the controls for the seat work. I've checked the fuses, all good. I've also checked the connections under the seat- all tightly in place. Last night my husband took apart the door panel and checked the actual switch on the door to see if it was getting power. It is. The only thing we can think of (after searching the forum) is that it could be the CF (Configuration Feature) Relay K24 located in the trunk OR the SCM is bad. My husband took out what looks like the K24 relay (not sure), but didn't open it up to check the internals and solder joints (we werent sure if this was the K24).

I called the mercedes dealership today to order the relay- but they have no idea what a CF relay is (can you believe that!) and they need a part number.
Can someone help me here? Desperate at this point as I am driving with a pillow to reach the pedals.....

I appreciate your help in advance.

Thanks!

fookoo303

mine did that a few months back and i disassembled the switch and cleaned all the contacts and reinstalled it and it works fine now.

MW_ATL

We have the same issue with my wife's SLK and I am planning on just replacing the switch sometime after the first of the year. (Ok, I'll actually probably just have it done during a service )

I would suspect that yours is the switch itself as well, we have that problem with Ford's at work frequently and the failure progresses in a very similar manner. I hate to compare the Fords and MBs, but as switch is a switch, not a whole lot different you can make them.

kellykel74

Thank you both- I will replace the switch to see if that fixes the problem. It's relatively cheap

Heavens1st

Had an issue with my forward/aft completely not working. All my other seat functions worked fine. My issue was the forwad/aft seat motor. Cheep fix about 45.00

samaritrey

where did you find it for $45? Did you do it yourself if so i would love if you had any pointers i need to do mine.

Heavens1st

Sorry the motor was $51.00, something else I orderd was 45.00. Luckily replacing the motor was easier then I thought. My seat was stuck in a position that blocked the 2 front bolts that mounted the seat to the chassis. So removing the seat was not an option.

There's 2 screws (T20 if I remember correctly) that hold the motor to the frame rail on the right side. I use a Flexi-screwdriver to access them from the back seat and just started with the bottom screw first. Took alittle patience because the 2 screws are kind of long and your in a awkward position. But thankfully it was pretty easy with the longer flexible screwdriver to remove and replace with the new motor. (plug & play) Purchased the OEM motor from mercedespartsclub.com


http://www.trademotion.com/partlocat...layCatalogid=0

samaritrey

wow you had the same problem i have. I looked at it and did not want to mess with it because i didn't know how the motor was attached. Now i will have to get a flexible screw driver and take it on.

kropsch

Hi fookooh303:
I have the same problem in my seat switch. Was it difficult to open the switch ?
Too many springs and little spheres to take care ? Did you work inside of a
plastic bag, to avoid loosing jumping parts ? As you can see, I'm afraid to open it.
Is there any hole that you could spray contact cleaner from the outside ?

fookoo303

Is this on your CLK? are your switches on the door or on the seat?

kropsch

Hi fookooh303:
The problem is on my wife's car, that is a 2003 C240.
Switches are on the door panel
Thanks for the fast answer. Paulo

fookoo303

My switch is on the seat so I am not sure if they are the same. I have read somewhere on the forum, that there's also a relay that goes bad that controls the switch. Ill try to find the thread and link it to you.

For my switch, I removed it from the seat and disassembled it. I think there was 2 or 3 small torx screws. Then I just took some electronic contact cleaner and cleaned all the contacts with it. I also took a razor blade (or a pick. I cant remember) and scraped off any residual buildup on the contact points.

kropsch

Hi fookoo303:
Once I disassembled a '83 500SEC power seat switch. I was scared with the quantity of springs and small spheres inside the switch. Did you find springs jumping out and spheres falling out of their place, when you open your switch ? Does it have memory ?
Paulo

fookoo303

My car does not have memory seat. It didnt contain any springs or any other internal parts either.

Your switch is different than mine so I am unsure of the internals on your switch.

kropsch

Hi fookoo303:
Thanks for the answers. They gave me courage to open
the switch.
Paulo

fookoo303

Did it fix your problem?

kropsch

Hi fookoo303:
No. So far I only got the courage.
I'm going out for vacations till the new year.
I intend to open the switch when I come back.
I will inform the result, good or bad.
Regards Paulo

tcshepp

Ad to the seat problem the steering wheel doesn't always work,any ideas?

Alan B

Good thread. Has anyone taken pictures of the "fixes" so all of us can benefit from such? If you have a solution to a power seat problem, please articulate what you did in a step by step process. Many of the experts on this forum have already created solutions for a host of issues, so you already have a go-by.

Thanks.

kropsch

I removed the switch from the door panel and opened it,
Inside there are several individual switches that I could not open. I just sprayed contac cleaner through the open spaces to go inside the switch, where the contacs are. I have moved the switch lever a lot of times to clean the contacts. After one month the seat is still working. Nevertheless I was disappointed not opening and really cleanig the contacts.

fookoo303

Great! So it worked for you then.

Glyn M Ruck

The contact cleaner has probably penetrated where it is needed. Be happy - it works!