Power Seat Headache - Mercedes-Benz Forum
Mercedes-Benz Forum Mercedes-Benz Forum Header Right

Auto Insurance

» Featured Product
Wheel & Tire Center

Go Back   Mercedes-Benz Forum > Mercedes-Benz Enthusiasts Forums > Mercedes-Benz Sedans/Wagons

BenzForum.com is the premier Mercedes-Benz Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools Display Modes
Old 06-07-2009, 05:39 PM   #1
shokwaves
Junior Member
 
Join Date: Sep 2005
Vehicle: 2002 C320 Wagon
Location: North of Baltimore, MD
Posts: 16
Power Seat Headache

Hey Now...

My driver's side power seat does not move fore/aft when I use the door switch. All other functions on the seat/wheel/headrest work fine, and the memory function works fine.

Any ideas on what the problem is and how to fix it? Can this be resynched the way the windows or sunroof can?

All the fuses are fine.

Thanks,
Al
shokwaves is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 06-07-2009, 06:49 PM   #2
RedLiner
Administrator
 
RedLiner's Avatar
 
Join Date: Jun 2009
Vehicle: 1993 SL500, 1998 SL500 pano top, 2005 ML270cdi.
Location: Spain
Posts: 638
With some Mercedes Benz models there occurs a 'Dead spot' with the seat adjustment.
If you have checked fuses try pressing the fore/aft button and at the same time gently try to push the seat forward or backwards. If it does start to move under motor power, when it reaches the stop point it should then re-set itself and hopefully continue working.

If not, suspect the motor
RedLiner is offline   Reply With Quote
Old 06-09-2009, 07:37 PM   #3
shokwaves
Junior Member
 
Join Date: Sep 2005
Vehicle: 2002 C320 Wagon
Location: North of Baltimore, MD
Posts: 16
The fuses are fine. The seat does move fore/aft when the memory button is pressed. The fore/aft switch does not make the seat move, however, it does still have the ability to make the seat tilt and adjust the height.

The motor is definitely working. The issue is likely either the control module with a loose wire; the door switch; or something totally different.

Perhaps there is a way to resync the seat control similar to the way the windows or sunroof can be resynched?
shokwaves is offline   Reply With Quote
Old 06-10-2009, 04:03 AM   #4
RedLiner
Administrator
 
RedLiner's Avatar
 
Join Date: Jun 2009
Vehicle: 1993 SL500, 1998 SL500 pano top, 2005 ML270cdi.
Location: Spain
Posts: 638
Al, perhaps a visual check to confirm that all wires, plugs and sockets are correctly in place would be a good idea. Then check the continuity of the door switch with a multi-meter. I will try to find out the colour coding of the switch wires and post back into this thread later.
RedLiner is offline   Reply With Quote
Old 06-11-2009, 11:24 AM   #5
RedLiner
Administrator
 
RedLiner's Avatar
 
Join Date: Jun 2009
Vehicle: 1993 SL500, 1998 SL500 pano top, 2005 ML270cdi.
Location: Spain
Posts: 638
Quote:
Originally Posted by RedLiner View Post
I will try to find out the colour coding of the switch wires and post back into this thread later.
Apologies for the delay in getting those wire colour codes, my WIS programme has decided to go AWOL. Hopefully it will be re-installed later.
RedLiner is offline   Reply With Quote
Old 06-11-2009, 02:48 PM   #6
RedLiner
Administrator
 
RedLiner's Avatar
 
Join Date: Jun 2009
Vehicle: 1993 SL500, 1998 SL500 pano top, 2005 ML270cdi.
Location: Spain
Posts: 638
OK, here is the seat wiring diagram for your vehicle, if you need a close up of any particular area just let me know.

Click on thumbnails to enlarge
Attached Thumbnails
Click image for larger version

Name:	seat1.jpg
Views:	843
Size:	65.4 KB
ID:	1191   Click image for larger version

Name:	seat2.jpg
Views:	533
Size:	60.3 KB
ID:	1192  
RedLiner is offline   Reply With Quote
Old 06-13-2009, 04:35 AM   #7
shokwaves
Junior Member
 
Join Date: Sep 2005
Vehicle: 2002 C320 Wagon
Location: North of Baltimore, MD
Posts: 16
Thanks for getting back to me. I conducted a visual check of the wiring, it appears to be fine. The connectors are all fine.

I have never used a multi meter (but can figure it out w/instructions), so could you explain how and exactly what I am supposed to hook one up to on the door control.

Have you ever heard of just one function of the seat controller not working? The fore/aft control lever also adjusts the seat height, which works. All the other seat/headrest/wheel functions work fine.
shokwaves is offline   Reply With Quote
Old 06-13-2009, 07:20 AM   #8
RedLiner
Administrator
 
RedLiner's Avatar
 
Join Date: Jun 2009
Vehicle: 1993 SL500, 1998 SL500 pano top, 2005 ML270cdi.
Location: Spain
Posts: 638
Just one other question, looking at my Alldata information on your model, it shows two seat adjustment switches, one on the door and the other on the side of the seat itself.
Does the fore and aft motor not work on both switches?
RedLiner is offline   Reply With Quote
Old 06-13-2009, 12:45 PM   #9
shokwaves
Junior Member
 
Join Date: Sep 2005
Vehicle: 2002 C320 Wagon
Location: North of Baltimore, MD
Posts: 16
The only seat adjustment switches are on the door panel.
shokwaves is offline   Reply With Quote
Old 06-13-2009, 03:37 PM   #10
RedLiner
Administrator
 
RedLiner's Avatar
 
Join Date: Jun 2009
Vehicle: 1993 SL500, 1998 SL500 pano top, 2005 ML270cdi.
Location: Spain
Posts: 638
Quote:
Originally Posted by shokwaves View Post
The only seat adjustment switches are on the door panel.

OK, then looking at the circuit diagram, M1 of the M20 seat motor group, I would suspect a fault in the driver seat module itself N32/1. If the memory function will operate the the fore and aft motor (M1) then the motor would appear to be OK.

The passenger side seat does share certain common parts of the electrical circuit but does have it's own seat module. Assuming that the passenger seat operates from the door switch without any problem then this would also suggest that the driver side seat module is at fault. (see photo)

You could try swapping over the modules for elimination purposes.
Attached Thumbnails
Click image for larger version

Name:	seatmodule.jpg
Views:	550
Size:	29.4 KB
ID:	1200  
RedLiner is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  Mercedes-Benz Forum > Mercedes-Benz Enthusiasts Forums > Mercedes-Benz Sedans/Wagons


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
seat redblackfan Mercedes-Benz Sedans/Wagons 5 04-24-2009 04:50 AM
Power Passenger Seat aviscomi Mercedes-Benz Sedans/Wagons 2 08-19-2006 10:57 AM
Seat questions? please help hyperlight900 Diesel Discussion 4 04-22-2006 05:55 PM
Power Seat Memory timwalker69 Mercedes-Benz Sedans/Wagons 0 12-12-2004 09:17 AM
1990 300SL Power Locks, Power Antenna, and trunck light joewood DIY/Tech Help 2 11-12-2003 08:35 PM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -6. The time now is 10:04 AM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
© AutoGuide