ballot

The seat control module in my 2001 C320 is causing a drain in my battery. I want to investigate this issue by looking at the module itself. If you have instructions on how to remove the module from under the seat, instructions for opening it up, and schematics, please attach them in this thread.

MJ50

it is a common problem...
not sure if u can repair it...

coin

I am not sure if there are posted instructions here.

But this problem is covered under the Starmarked extended warranty.

WaveyKat

had mines replaced at the dealer!

TruTaing

Taking the module out is really easy.

IIRC:

Unplug a few plugs that you can see from the under front of the seat(s).

Push a few clips around and pull. It should come out really easily.

As for diagrams of the thing itself. I dunno? You can get a new module shipped to you for about 200 bux.

KIRA

yup happened to my 02 C320, is a really common problem, just unplug it then you will be fine, when you need to adjust your seat, plug it back in, cake...

but in the end my SA trick the dealer had my module replaced for free even my car is out of warrenty

ballot

Sweeeeeet. How did you manage to tick them?

They should have a recall on these unit. Everybody is complaining about them

KIRA

recall only happened if is a safety reson

and as for the trick

you need those "asian connection"

ML55CLA45

if you are interested... i have a new drivers seat control module... i found the recipt recently and i purchased it from the dealer for 300 something...

i purchased it b/c of seat problems i was having... but it ended up being a motor....

contact me if you interested

-carino

sstcobra

The passenger seat on my 2002 C320 does not travel back more than half way. I have looked for jams in the track and have found nothing out of the ordinary. Can someone tell me if this can also be a control module problem?

ML55CLA45

does the seat move in any other direction? this was the same problem with my drivers seat..... it would move in all other directions but not back... it ended up being the motor

sstcobra

The seat moves in all directions the full travel, except sliding rearward.

If it is the motor, what in a faulty motor would cause this????

ballot

The seat moves in all directions. Its just the module staying awake and causing a drain in the battery. Is there a specific chip/IC on this module that's causing this?

ML55CLA45

well.. like i stated before. my seat would not move back at all. operational in all directions except reverse. i initially thought that it was the control module and purchased one. the module did not correct my problem. i took my car to the dealer and they replaced a seat motor that was dedicated to reverse.

i dont know what exactly in the faulty motor would cause this... besides the plan fact that the motor went bad....

ML55CLA45

sounds to me that you need a new module. there might be a new chip/ic but i dont know how you would just change it specifically...

johndddd

I’m having battery drainage problems too. I just unplugged the leads to the modules in both seats and recharged my NEW BATTERY. However I’m confused here, when the key is out of the ignition there is NO POWER to the seats. So how can the controllers drain the battery? Also I am trying to verify if you have to change both or just one. I wanted to start with the passenger side and see if this solves the problem. Does anyone KNOW FOR SURE if you have to change BOTH?


Respectfully

Marky Bends

Hmm, my battery has been draining too. I unhooked the seats but it still happens..My mechanic is pulling his hair out trying to find the cause of the drain.

All I can think of is I think this problem started after I tried to give someone a jump. I've done lots of reading on this problem but..Any ideas?

thanks.

johndddd

from what I have gathered seat module or dome light unit in from of your rear view mirror.

acedking90

Could you please emphasize on this? I have a drain somewhere too, its impossible to find, the dealership says its the radio module...which is a light 5 grand.

johndddd

Good morning:

It could be anywhere, however the most likely culprit is your seat control modules, these are located under your seats. They control the movement. They are electrical parts and have a life-expectancy. Heat work on electrical parts, when you park your car outside in the summer months it has a toll on electrical parts then they fail. Unplug your seats, there will be a 3 conductor cable I believe its a #14 wire in the front of each seat, then see if your battery drains after 3 days or so. If this solves the drainage probem thats the culprit. In my case it was not. It was an aftermarket sub woofer that was not shutting off. However the seat modules go bad often. There have been several post of members having to change them out @ 1k parts and labor. I have 2 modules NEW IN A SEALED BOX if this is your problem. They sell for 300 each I have them for sale @ 500. Again NEW NEVER OPENED BOX.

TruTaing

1k in parts + labor is ridiculous :x That is ALOT of labor.

It takes almost 20 minutes to swap them out if ya know what you're doing... the process took me about 30 mins to swap mine out. I guess it also took a few 10 minute sessions to unplug fuses and let the car sit for a day though. Also it only took my broken seat module one day to drain my battery....

TemjinX2

here's my write up on how to replace the control modules.

I recently replaced mine and it solved the drainage issues.

https://mbworld.org/forums/c32-amg-c55-amg-w203/225393-c-class-seat-modules-compatible-c32.html

johndddd

thanks for that info, now I know the modules that I have for sale will work on a C32 as well.