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Where is the aux battery?

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Old Dec 6, 2019 | 08:20 PM
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seal
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MY 11 CL550
Where is the aux battery?
The aux battery died on my CL550 (2011) and I need to replace it.

Any idea where it is? and any help with part number before I go search it and probably get it wrong? LOL.

Thanks!
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Old Dec 6, 2019 | 09:04 PM
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For the "additional battery" WIS says it's behind the left (driver's side North America) side of the instrument panel. Do you have ECO start/stop? Best to post your VIN.

https://www.fcpeuro.com/products/mer...iABEgJIvfD_BwE
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Old Dec 7, 2019 | 08:15 AM
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MY 11 CL550
Originally Posted by chassis
For the "additional battery" WIS says it's behind the left (driver's side North America) side of the instrument panel. Do you have ECO start/stop? Best to post your VIN.

https://www.fcpeuro.com/products/mer...iABEgJIvfD_BwE
no eco start stop. That location does not sound very easy to get to... hmm... I sure hope the inst panel doesn't have to be removed? It took away features like distronic cruise etc.

Here is my vin WDDEJ9EB5BA027473
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Old Jan 19, 2020 | 06:52 PM
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Did you find it? Supposedly I have a battery under the hood for starting purposes and 1 in the trunk according to my local tech.
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Old Feb 23, 2020 | 11:17 AM
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Go through the back trunk and it's on the rear passenger side right behind the wall . Find a tab uptop or the sides (or grab the fuzz of the carpet) and pull straight back.

That's where it is on my 08 cl600.

Anyone figure out the back drivers side window not coming down or up? Besides the $525 bill at the dealer ship?
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Old May 12, 2020 | 02:10 PM
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Originally Posted by c4r7
Go through the back trunk and it's on the rear passenger side right behind the wall . Find a tab uptop or the sides (or grab the fuzz of the carpet) and pull straight back.

That's where it is on my 08 cl600.

Anyone figure out the back drivers side window not coming down or up? Besides the $525 bill at the dealer ship?
The panel is tight and so very difficult to remove, after I finally managed to get my panel out to get at the battery, I fitted a handle to the panel, to make it a bit easier to remove.
I had the same problem with the rear window not working, turned out to be a window control module, cost was £375 for a refurbished one including fitting.
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Old Sep 9, 2020 | 05:49 PM
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At some point in W216/W221 production the aux battery location was changed from trunk to behind dash.

https://www.youcanic.com/guide/2008-...ry-replacement

Mercedes have two batteries to attempt to ensure you will always be able to shift transmission out of Park.
Last edited by lkchris; Sep 9, 2020 at 06:02 PM.
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Old Oct 25, 2020 | 05:02 PM
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Originally Posted by lkchris
At some point in W216/W221 production the aux battery location was changed from trunk to behind dash.

https://www.youcanic.com/guide/2008-...ry-replacement

Mercedes have two batteries to attempt to ensure you will always be able to shift transmission out of Park.

Still haven't done this, but I'll get to it this weekend. lol... Hopefully that's where it is!
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Old Oct 25, 2020 | 10:44 PM
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chassis
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Originally Posted by seal
Still haven't done this, but I'll get to it this weekend. lol... Hopefully that's where it is!
Here you go.
Attached Files
File Type: pdf
W216 lower instrument panel.pdf (347.1 KB, 351 views)
File Type: pdf
W216 aux battery.pdf (448.7 KB, 654 views)
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