C240 seat control module - Mercedes Forum - Mercedes Benz Enthusiast Forums

Mercedes C Class Mercedes C230 Kompressor, Mercedes C240, Mercedes C280, Mercedes C320, Mercedes C350 Sedans, Coupes, and Wagons.

Thread Tools Search this Thread
Old 10-11-2007, 09:41 AM
Thread Starter
Join Date: Sep 2007
Posts: 6
Default C240 seat control module

good morning, I have a problem with battery drain overnight. I believe I have narrowed it down to the drivers seat control module (I unplugged it for several days and did not have the battery drain overnight). Before replacing it, I wanted to know if the seat control module could also cause my sunroof to not work properly (the roof will not "one touch" open, I have to continuosly press the open switch and it goes about an inch each time until open. Also, when I close the sunroof, it goes all the way past closed and "pops open" then will not close.)

I know the seat and roof are both going through the rear SAM in the left rear of the trunk (according to the wiring diagrams). Can the seat control module affect dthe roof or is it the SAM?

Thanks. Alan
Reply With Quote
Old 10-11-2007, 05:06 PM
Join Date: Nov 2005
Location: Vancouver, BC
Posts: 33
Default RE: C240 seat control module

Your sunroof will have to be reset with the (open/close) switch. This was probably caused by your battery voltage dropping or being drained. To reset, keep closing the sunroof untilit reaches the closed positon. Then open to the sunroof to the pop-up position. Then "hold the button" in this position for5 to 10 seconds. This should reset the sunroof back to the "one touch" settings. Hope this works for you.
Reply With Quote
Old 10-11-2007, 10:26 PM
Thread Starter
Join Date: Sep 2007
Posts: 6
Default RE: C240 seat control module

yeah. tried that already about a dozen times. no luck. guess i'll change the module tomorrow and then try to reset the roof again after that.
Reply With Quote
Old 05-09-2008, 05:16 AM
Join Date: May 2008
Posts: 1
Default RE: C240 seat control module

hi, i need some info about SAM module, i exchange battery and now elec. seats, wipes, alarm, window not working. my question is that i need new Sam module or need just reset??
Reply With Quote
Old 01-04-2009, 10:17 PM
Join Date: Jan 2009
Posts: 2
Default RE: C240 seat control module

You probably took care of the problem but for new people with this problem, there is a very simple fix that involves cutting one wire from the plug and splicing it into another one. The plug I'm referring to is the one that goes into the seat at the bottom. Basically, the defective module is drawing power even when the engine is off. There are two positive and one ground (3 wires) in the plug. Cug the ont that is positive when the engine is off. Cap off the end that goes to the battery / electronics. Splice the end that goes to the seat controller with the positive wire that is on only when the engine is started. The wire you cut allows the seat to be used a few minutes after / before the car is started and is a convenience feature. I don't care if I lose this feature and especially for an extra $450 per seat I con't care even more.

I found this fix on the Web and wanted to pass it along to folks who have the same problem with the seat module and battery draining.
Reply With Quote
Old 01-18-2009, 05:15 PM
Junior Member
Join Date: Jun 2008
Posts: 4
Default Same problem

2001 C240. Seat control module drains the battery in 2-3 days. I looked underneath the seat and found a bunch of plugs. 4 in the back and 2 or 3 in the front. Which ones do I disconnect? Someone mentioned here that you can splice a wire that is for keeping the seat control on after the car if off, and that should fix the problem. Either way I am completely lost. Any pictures of the steps needed or diagrams would help.

[email protected]
Reply With Quote
Old 12-14-2010, 09:30 PM
Junior Member
Join Date: May 2008
Posts: 1

Same problem :/ Pictures?
Reply With Quote
Old 01-28-2011, 07:01 AM
Junior Member
Join Date: Jan 2011
Posts: 1

i have c c240 2002, 75000 miles i have many problems:
1- i should hold the accelaration pedale more than 30% to have a response but when i use the tiptronic the pedal response immedialtly. is this problem due to a bad MAF?
2- the mpg is not very well, is between 15-16 in city and 25 highway, why this difference?also the mpg very bad when the road is up.I don't have any problem.i went to a mercedes shop, they told me taht everything is ok
3- the driver back seat don't function always.
4- i have a problem in the lock of driver's door, when i open/close tha car, the lock go up and down many.can i repair it instead of replace it?

thank you
Reply With Quote
Old 02-21-2011, 07:47 PM
Junior Member
Join Date: Jul 2009
Posts: 8

I have 2005 C-240 with about 11,900 miles on.

I had B-service about two weeks ago, and they also changed the battery.

yesterday when I tried to change the driver's seat settting, the headrest and recline don't' work at all but the seat moves front and back.....and everything else is working okay.

Today I brought the dealer, and they told me that they have to change the module.

Since I live in Hawaii, I have to wait about one week.....and the estimate is about $1,100(including the labor, $125 per hour).
I hope that they can fix alright and in perfect!?
Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
'05 C240 Seat Control Module Ery Mercedes C Class 0 09-10-2013 11:43 PM
2001 C240 Seat Control Module essclaire Mercedes C Class 1 01-11-2013 01:04 PM
seat control module mercedes911 For Sale / Trade Classifieds 0 01-24-2008 05:08 PM
C240 seat control module alangregory79 Mercedes C Class 0 10-11-2007 09:40 AM
C240 seat control module alangregory79 General Tech 0 10-11-2007 09:39 AM

2005, battery, benz, c240, control, convenience, drain, mercedes, mercedesbenz, module, sam, seat, sunroof, unit, working

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Featured Sponsors
Vendor Directory

All times are GMT -5. The time now is 08:39 PM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.