01 C320 Battery Drain Prob HELP!!
Thread Starter
Almost a Member!
Joined: Jan 2007
Posts: 69
Likes: 0
From: Maryland
C320
01 C320 Battery Drain Prob HELP!!
Ok have had this C320 for about a year no problems then all the sudden I get a message something to the effect light sensor problem visit workshop, well after waking up with a dead battery I considered the sensor that turns on your lights automatically when it becomes dusk out, so I used the headlights with the manual switch- no more problems...........started using the sensor again worked for 3months, then dead battery, used manual lights, still a problem, battery keeps draining, full drain occurs in about 6hrs, hooked up a multimeter to the battery and it looses voltage slowly with the car turned off, with the car running I get 14.4volts which means the altenator is ok, but............every nite I wake up with a dead battery- any suggestions???
MBWorld Fanatic!
Joined: Nov 2001
Posts: 5,851
Likes: 196
From: Huntington Beach, Ca.
'17 Jaguar XF
There are several threads that talk about battery drain. Seat module is a big failure item for this symptom. But you're on the right track....keep disconnecting systems until the drain stops.
MBWorld Fanatic!
Joined: Jul 2005
Posts: 2,989
Likes: 0
From: San Jose, Bay Area
2002 C230 coupe , NOt THE AVATAR!!
DEALER ASK ME TO PAY FOR REPAIR!!
my car is 02 and is out of warranty...
cost total $1k for these **** to replace....
do u guys think i could talk to benz said is their fault?? and get free of charge?
Member
Joined: Nov 2004
Posts: 202
Likes: 0
From: Huntington Beach, California
2002 C230 Coupe
I paid $500+ at the dealer to have them diagnose the problem. After 3 days, they said that there was not problem! WTF? If I leave the car for a week, the battery is drained. I have no idea what's causing the drain...
Bob
Bob
MBWorld Fanatic!
Joined: May 2005
Posts: 1,389
Likes: 1
'06 CLK500
I experienced the same problem (jumpstart the battery two times in 1 day) and the dealership performed "current draw test". They found that my right front ESA module was causing the battery draw. They disconnect ESA and ordered the new part from Germany.
I hope this helps
!
I hope this helps
!
Member
Joined: May 2006
Posts: 235
Likes: 0
From: Bangkok
C200K W203
Most likely you might have leakage from your seat module. This is common problem for late model benz. Its a shame but this is why people are starting to question Benz' electronic reliability. I got mine replace after replacing 2 batteries and they said I had to replaced both left and right module cost me almost $1000 
Trending Topics
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
Moderator Alumni
Joined: Apr 2006
Posts: 3,255
Likes: 22
From: Seattle
w203 m112
Please clarify?
-j0hn
Thread Starter
Almost a Member!
Joined: Jan 2007
Posts: 69
Likes: 0
From: Maryland
C320
I believe it sounds like it s class action law suit time, if Mercedes wont do recalls then we all get together and FILE, if interested send me your information, believe me I will get the ball rolling, on top of this issue is the other one......................how many have had ball joint replacements on late models? expecially 2001's?
MBWorld Fanatic!
Joined: Nov 2001
Posts: 5,851
Likes: 196
From: Huntington Beach, Ca.
'17 Jaguar XF
Do you mean front bushings? Count me in on the bushings. Even though the seat module/battery drain problem is well known I don't think it's prevalent enough to do a class action on. If you're that interested in doing a class action go after the MB SBC brake backup sytem and do us all a favor. You might even save your own life.
Thread Starter
Almost a Member!
Joined: Jan 2007
Posts: 69
Likes: 0
From: Maryland
C320
Ok I went out and disconnected the seats, the front side plug ins? I guess on the back is the motor plug, anyhow after disconnecting them..........nothing the "low hum" was still happening, and in addition the airbag system was also off, tried waiting 10-15mins with it disconnected then reconnected ................nothing so Im at a loss, did someone say EAS system? can you elaborate on that one please.
MBWorld Fanatic!
Joined: Nov 2001
Posts: 5,851
Likes: 196
From: Huntington Beach, Ca.
'17 Jaguar XF
[QUOTE=jhartmac;2016055]...nothing the "low hum" was still QUOTE]
If you're talking about the low hum noise coming from the overhead console....that is normal. There's a fan in there that runs for a while even after the key is removed.
If you're talking about the low hum noise coming from the overhead console....that is normal. There's a fan in there that runs for a while even after the key is removed.
Newbie
Joined: Sep 2006
Posts: 24
Likes: 0
From: Biloxi, MS
2001 C320
hi, thank god i found this post. i recently found out what was draining my car over night, the seats. i unplugged all the seat fuses and it stopped draining. i thought it was my car stereo i just got put in. but i'm dead serious its the seats cuz after i unhooked the seat fuses, radio fuse still in it does not die after letting it sit for two days. i was wondering how much does the stealership charge for a repair like this, or has the seats been recalled? thanks let me know. been having the problem for months and would really like to start driving my car w/o the fear of battery problems again. thanks
Thread Starter
Almost a Member!
Joined: Jan 2007
Posts: 69
Likes: 0
From: Maryland
C320
Ummm..........ok since the fuse box does not have a schematic on it how do you find which ones control the seats.............or did you unplug it directly at the plug in buss bar under the seat? Can someone break this down for me, I know I can be a little slow lol
Thread Starter
Almost a Member!
Joined: Jan 2007
Posts: 69
Likes: 0
From: Maryland
C320
Ok it worked!!!!!!!!! I disconnected I guess the correct power plug vs the control plug, but anyway no more dead battery, thats a relief, now the question is, for those of you who have had this issue, is it isolated to one seat or both? and can I purchase the part myself from MB? if so can you reference the part # and name please?
Super Member
Joined: Feb 2007
Posts: 809
Likes: 74
From: Dallas, TX
2008 E63 wagon (1 of 62)
you should be able to purchase them from MB whenever you need to.
The most common ones I have seen fail are the passenger seat control modules. I am not saying that the driver's seat control module does not also fail, but the more common one is the passenger seat. Also on the earlier W203 cars I have seen the overhead control panels cause a battery drain (Dome Lamp Assembly) As for the part numbers for the seat control modules, they may vary from model to model.
The most common ones I have seen fail are the passenger seat control modules. I am not saying that the driver's seat control module does not also fail, but the more common one is the passenger seat. Also on the earlier W203 cars I have seen the overhead control panels cause a battery drain (Dome Lamp Assembly) As for the part numbers for the seat control modules, they may vary from model to model.
Thread Starter
Almost a Member!
Joined: Jan 2007
Posts: 69
Likes: 0
From: Maryland
C320
Thank you for the info I called MB today they said depending on the VIN# that would designate what seat control module would fit however he said they average about #189.00 ea................well I will be replacing those myself needless to say.
Thread Starter
Almost a Member!
Joined: Jan 2007
Posts: 69
Likes: 0
From: Maryland
C320
Wow update after 2days of no dead battery guess what its back again!!!! and believe me its not the battery, in fact its a new battery, I tested it by disconnecting the negative terminal overnight, after reconnecting in the morning no problems.....strong battery, now not sure WTH to do. 
MBWorld Fanatic!
Joined: May 2005
Posts: 1,389
Likes: 1
'06 CLK500
The part # 211-870-47-26 is for the RF seat control module.
