CLS Coupe (C219) Discuss the CLS Coupe.

Red Battery Light

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Old 07-03-2019, 02:29 PM
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Red Battery Light

Hello all. This is my first post so please take it easy on me. LOL
(Yes I searched before I posted)

I bought a 2006 CLS500 had it for 2 days and ive been fighting the red battery light.STILL the Battery light is ON!!
It has a new alternator. new rear battery and a new front battery. The light comes on occasionally then goes away. Now it seems like its here to stay UNLESS i find the real culprit.
Is there a Fuse connected to the charging system that I might be missing?
What am i doing wrong here?
Old 07-03-2019, 03:44 PM
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See attachment for a better understanding of two-battery system (211 same for 06 CLS). Before replacing additional parts have someone do a quick test using MB DAS (MB diagnostics).
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Old 07-03-2019, 04:18 PM
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Great information!
Now I need to find the location of the K57/2 and the N82 location.
I will be working on it this weekend.
Old 07-03-2019, 04:28 PM
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Relay & BCU...


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CLS BCM.pdf (386.4 KB, 125 views)
Old 07-03-2019, 04:36 PM
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Konigstiger i appreciate your insight..

Is this mounted on the firewall? Near the AUX battery?
Where is the N82 Location?
I have seen in other Mercedes models that its under the passenger footwell carpet.
Old 07-03-2019, 04:50 PM
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So after a quick search ive found...
These are not my photos. i do not take credit for these photos..
I hope it will help other forum members. I have been wrestling with this issue for the past few days.


I will be changing /checking out these parts and hopefully just changing a couple fuses to get back on the road.




Old 07-03-2019, 07:24 PM
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Found them. 150 amp fuses!! It was kind of a pain. Little plastic clips are holding it together. This is the underside.
Old 07-03-2019, 07:26 PM
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The removal of the mat and checking these fuses turns out to be a dead end. These fuses and all of the others under the passenger side floor mat are good.

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