C32 AMG, C55 AMG (W203) 2001 - 2007

seat module

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Old Dec 13, 2008 | 06:42 PM
  #1  
RedBull's Avatar
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seat module

Well it was my turn for the seat module failure. I went out to the garage to get something out of the car and it was as dead as can be. I'll probably do the $20 fix that was posted up on here until I can find replacement modules, and just unplugged the modules for both seats for right now. I'm going to miss the heated seat.....
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Old Dec 13, 2008 | 08:25 PM
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Originally Posted by RedBull
Well it was my turn for the seat module failure. I went out to the garage to get something out of the car and it was as dead as can be. I'll probably do the $20 fix that was posted up on here until I can find replacement modules, and just unplugged the modules for both seats for right now. I'm going to miss the heated seat.....
all you have to unplug is the first connector closest to the door. The one closest to the center of the car is the heater and it can be left plugged in.

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Old Dec 13, 2008 | 10:00 PM
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Originally Posted by loungn14
all you have to unplug is the first connector closest to the door. The one closest to the center of the car is the heater and it can be left plugged in.

Cool, thanks Jake.
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Old Dec 14, 2008 | 02:58 AM
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yeah those modules are junk.
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Old Dec 14, 2008 | 11:20 AM
  #5  
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If you end up looking for a new one Brad, let me know.
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Old Dec 14, 2008 | 01:54 PM
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Unplug fuse #27 or #33, they are both 30amps so that way you'll have
the seat you like w/out looking like you're driving a lowrider

Not the best pick but you get the idea

And what's this $20 fix I just read???
Attached Thumbnails seat module-0_image_045.jpg  
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Old Dec 15, 2008 | 02:06 PM
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Originally Posted by ImportLabSRT
If you end up looking for a new one Brad, let me know.
Hey,

Have you got one for sale have you? What does removing those fuses do? Is that just a way of de-activating without dangling wires?

Jon
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Old Dec 15, 2008 | 06:42 PM
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Originally Posted by loungn14
all you have to unplug is the first connector closest to the door. The one closest to the center of the car is the heater and it can be left plugged in.

I unplugged just the one connector closest to the door, and the car has been fine since. I had the car sitting outside all morning in the wonderful sub-zero winds and it still started up just fine. Thank goodness I can still use the seat warmer.
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Old Dec 16, 2008 | 04:43 PM
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Freaky behavior from mine today! Everytime I tried to move the seat there was a relay click and rev counter drop to zero, speedo drop to zero, all warning lights on dash on bright. 20 mins later, all back to normal. Reckon I might be having a flat battery one of these mornings.....
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Old Dec 16, 2008 | 05:34 PM
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Originally Posted by gaz
Freaky behavior from mine today! Everytime I tried to move the seat there was a relay click and rev counter drop to zero, speedo drop to zero, all warning lights on dash on bright. 20 mins later, all back to normal. Reckon I might be having a flat battery one of these mornings.....
A weak battery makes these cars do wacky things. In addition to a transmission problem, I was able to open my sunroom but not close it!

PS: I'm on my second attempted seat module replacement (first one was dead) from some shop in Frederick MD. If it doesn't work this time, I will be looking at the hardwire mod.
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Old Dec 16, 2008 | 05:40 PM
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I wish Mercedes do a full recall on the seat module failure. This issue drives all Benz owners NUTZ.
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Old Dec 21, 2008 | 03:48 AM
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Originally Posted by neihouma
Unplug fuse #27 or #33, they are both 30amps so that way you'll have
the seat you like w/out looking like you're driving a lowrider

Not the best pick but you get the idea

And what's this $20 fix I just read???
just click on my sig. you can just take a relay and get a 12v source as the trigger and turn the seat module off and on with the 12v source.

For example you can use the cig lighter as the trigger so it'll only turn on when you put the car in the second position and turn off when you take out your key.
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Old Dec 21, 2008 | 08:57 AM
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Got the new seat module, just haven't had time to install it until today.......and it's 5 below zero right now. My car is in the garage, but it still gets cold in there.
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Old Dec 21, 2008 | 10:59 AM
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Just finished installing the new seat module. It's nice having a fully functional seat & steering wheel again. Thanks again Bryan.
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Old Dec 21, 2008 | 11:47 AM
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Originally Posted by RedBull
Just finished installing the new seat module. It's nice having a fully functional seat & steering wheel again. Thanks again Bryan.
No problem Brad.... anytime.
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Old Dec 21, 2008 | 03:06 PM
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Originally Posted by TemjinX2
just click on my sig. you can just take a relay and get a 12v source as the trigger and turn the seat module off and on with the 12v source.

For example you can use the cig lighter as the trigger so it'll only turn on when you put the car in the second position and turn off when you take out your key.
Damn I have signatures turned off. Thank you kindly
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Old Dec 22, 2008 | 01:30 PM
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Originally Posted by TemjinX2
just click on my sig. you can just take a relay and get a 12v source as the trigger and turn the seat module off and on with the 12v source.

For example you can use the cig lighter as the trigger so it'll only turn on when you put the car in the second position and turn off when you take out your key.
Do you have the wiring diagram for the seats? the relay fix is ingenious, i cant believe i did not think of it. thanks
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Old Dec 22, 2008 | 03:38 PM
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Originally Posted by ImportLabSRT
No problem Brad.... anytime.
YGM.

I've had TWO different seat modules (not new ones) sent to me by a MB salvage shop, and neither one worked at all. It seems kind of strange. They looked like the original unit, and all the plugs were the same. But in both cases, the module was dead. My original module still works -- it just kills the battery. These modules did nothing.
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Old Dec 22, 2008 | 06:10 PM
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The car sat out in the brutal cold all day while I was at work, and started up just fine after 10+ hours in -15 wind chill. No more worries.
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Old Dec 22, 2008 | 07:41 PM
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Originally Posted by Donmun
Do you have the wiring diagram for the seats? the relay fix is ingenious, i cant believe i did not think of it. thanks
unfortunately i dont, i had to figure it out the hard way. someone suggested you can just use a switch to turn it on and off.

Seems like a easier solution for a lot people. I added the info to the seat module thread.
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Old Dec 22, 2008 | 07:42 PM
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Originally Posted by Fifth Ring
YGM.

I've had TWO different seat modules (not new ones) sent to me by a MB salvage shop, and neither one worked at all. It seems kind of strange. They looked like the original unit, and all the plugs were the same. But in both cases, the module was dead. My original module still works -- it just kills the battery. These modules did nothing.
yeah i had the same experience with the ones i bought on ebay too. They worked for 6months then had the same problem...all modules junk except for the new revision ones.
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Old Jan 12, 2015 | 06:26 PM
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Originally Posted by TemjinX2
yeah i had the same experience with the ones i bought on ebay too. They worked for 6months then had the same problem...all modules junk except for the new revision ones.
TemjinX2 can I just pull the fuse instead of disconnecting the seat control module?

Last edited by Dknowz; Jan 12, 2015 at 06:43 PM.
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Old Jan 14, 2015 | 07:25 PM
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You can try and see if it works...

Fuses are:
2, 21, 27 for driver's seat;
1, 22, 38 for passenger's seat.

1 and 2 are in the rear SAM in trunk.
2x and 38 are in the driver's side fuse box.

(If the fuse positions are the same across all W203's that is)
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