W215 battery drain

May 16, 2015 | 08:52 AM

kk100

Thread Starter

Member

Joined: Feb 2013

Posts: 100

Likes: 2

CL65

W215 battery drain

Hello all

Hopefully some of the electric wizzes on here can help me out! I have got the dreaded battery drain issue in my CL. At first I thought it was just my battery going bad so got a new one at the dealers. Fine for two days than it just dead. So got myself a little fuse blade meter from Maplin and set about checking each fuse - of course I left the necessary areas open and locked the car and waited 30mins before checking the fuses. From looking about on the internet it appears that a draw of 50ma to 65ma could be normal for the w215's . Anyway Fuse 82 which I understand covers the following:

AAC[KLA] control and operating unit (N22)
Heating System Delivery (A31)

was pulling 1.26a - so I think the issue is with this one as the combined ma of all the remaining fuses equated to 62ma. Does anyone know what the two items in the points above are/control and what in them could be causing the issue. Any help and comments very welcome
Thanks

May 17, 2015 | 02:24 AM

tusabes

MBWorld Fanatic!

Joined: Jan 2008

Posts: 6,150

Likes: 533

Mercedes

This will not fix your problem but the following two products at Amazon work as a long term solution to cars with current leaks and dead batteries as they will let you disconeect and reconnect the battery with the click of a remote, no need to get in trunk and remove cable

http://www.amazon.com/gp/aw/d/B00KTS..._1430850192742

http://www.amazon.com/gp/aw/d/B000P4...B4L&ref=plSrch

May 17, 2015 | 05:38 AM

optimusprime m1

Super Member

Joined: Jan 2015

Posts: 920

Likes: 46

From: Worcestershire UK

W124 260E

Nice bit of kit wish i could get one over here in the uk .But if the car is not locked up , and let go in to sleep mode it will run the battery down.

May 17, 2015 | 10:35 AM

kk100

Thread Starter

Member

Joined: Feb 2013

Posts: 100

Likes: 2

CL65

Quote:

Originally Posted by tusabes

This will not fix your problem but the following two products at Amazon work as a long term solution to cars with current leaks and dead batteries as they will let you disconeect and reconnect the battery with the click of a remote, no need to get in trunk and remove cable http://www.amazon.com/gp/aw/d/B00KTS..._1430850192742 http://www.amazon.com/gp/aw/d/B000P4...B4L&ref=plSrch

Thanks for that - I never even knew such a thing existed!

I would still like to find my problem though even if I went ahead and got one of these

May 17, 2015 | 11:47 AM

kk100

Thread Starter

Member

Joined: Feb 2013

Posts: 100

Likes: 2

CL65

Quote:

Originally Posted by optimusprime m1

Nice bit of kit wish i could get one over here in the uk .But if the car is not locked up , and let go in to sleep mode it will run the battery down.

I am sure somewhere can post to the UK if you really wanted one

May 17, 2015 | 02:26 PM

biker349

MBWorld Fanatic!

Joined: Oct 2009

Posts: 1,924

Likes: 38

cl600

there have been problems with the memory on the seats drawing power. disconnect the seat modules and see if you still get a draw.

May 17, 2015 | 03:29 PM

kk100

Thread Starter

Member

Joined: Feb 2013

Posts: 100

Likes: 2

CL65

Quote:

Originally Posted by biker349

there have been problems with the memory on the seats drawing power. disconnect the seat modules and see if you still get a draw.

Thanks I will have a look at this

6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)

Verdad Gallardo

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

May 22, 2015 | 04:31 AM

kk100

Thread Starter

Member

Joined: Feb 2013

Posts: 100

Likes: 2

CL65

Quote:

Originally Posted by biker349

where the seat modules the culprit?

I never got a chance to get a look at the car - hopefully in the next few days I will get at it!

May 22, 2015 | 02:56 PM

#10

kk100

Thread Starter

Member

Joined: Feb 2013

Posts: 100

Likes: 2

CL65

Quote:

Originally Posted by biker349

where the seat modules the culprit?

So when you say seat modules do you mean remove fuses 64 and 66 which are the controls for the driver and passenger seats? Thanks

May 22, 2015 | 07:12 PM

#11

tusabes

MBWorld Fanatic!

Joined: Jan 2008

Posts: 6,150

Likes: 533

Mercedes

No the seat control modules

They are not fuses

May 23, 2015 | 05:33 AM

#12

kk100

Thread Starter

Member

Joined: Feb 2013

Posts: 100

Likes: 2

CL65

Quote:

Originally Posted by tusabes

No the seat control modules They are not fuses

Ok so it is actually the seat controls themselves. Is there a particular way of disconnecting them?

May 24, 2015 | 07:51 AM

#13

kk100

Thread Starter

Member

Joined: Feb 2013

Posts: 100

Likes: 2

CL65

Quote:

Originally Posted by kk100

Ok so it is actually the seat controls themselves. Is there a particular way of disconnecting them?

Sorry to be a pain but is this located under the seat?

May 24, 2015 | 12:52 PM

#14

biker349

MBWorld Fanatic!

Joined: Oct 2009

Posts: 1,924

Likes: 38

cl600

actually i'm not sure about the seat, but they can be disconnected from inside the door, or at the fuse if there is one for the seats. i wouldn't try disconnecting at the door until you do some research on how to remove the modules form the doors.