C450/C43 AMG
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2020 C43 w/ JB4 + BCM

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Old 05-03-2023, 12:29 AM
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can anyone provide any insight on how to install the BCM? the directions say to connect the blue wire from the BCM to the jb4 connector pin#1? <--- my issue is that within the circuit board, there is nothing that denotes "pin#1"

I have a 2021 GLC43 and am using (trying) the 2015+Mercedes JB4, with this BCM add on to combat the limitations of the CPC module. Burger Support said the BCM should be compatible for the GLC43 since the C43 shares the same M276 motor.

All advice and tips or tricks are appreciated! PM for phone number if you genuinely want 2 help me install lol
Old 05-03-2023, 08:08 AM
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This is from the c63 install but pin 1 is prob the same email bms support
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Old 05-03-2023, 10:21 AM
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MaverickC43 has it right. I did mine last week and the BCM goes exactly where the red arrow is pointing.

I had to take a couple pics with my phone to see the "pin 1" label since my old man eyes are limited.


Old 05-03-2023, 11:20 AM
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Bms just sends c43 to youtube on the link
but has pic for the c63, bc those old rich guys told told them ‘they ain’t watching u tube ‘l
lol
Old 05-03-2023, 06:10 PM
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Add anybody notice long spaces on the shifts with Jb4 ?
or better yet anybody figure how to fix it in the settings ?
Old 05-03-2023, 06:33 PM
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lol

Last edited by user 47474748; 05-04-2023 at 12:18 AM. Reason: lol
Old 05-03-2023, 06:52 PM
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Originally Posted by MaverickC43
Add anybody notice long spaces on the shifts with Jb4 ?
or better yet anybody figure how to fix it in the settings ?

Mine is still snappy. Hasn't changed shifts at all
Old 05-04-2023, 05:55 PM
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off topic but, any suggestions for O2 spacers to defeat a CEL caused by catless downpipes?
Old 05-06-2023, 12:37 PM
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I thought Bms said jb4 wasn’t good with cattless DP. Or maybe they need to give no new parameters. Email their support
Old 05-06-2023, 07:12 PM
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Originally Posted by MaverickC43
I thought Bms said jb4 wasn’t good with cattless DP. Or maybe they need to give no new parameters. Email their support
It's not that it's not good with it, it's just that it can't bypass the CEL that will normally occur with catless DPs. You need a tune if you have catless DPs. JB4 can't and wasn't intended to correct the CEL.

Old 05-10-2023, 12:41 AM
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Originally Posted by Howyalivin
It's not that it's not good with it, it's just that it can't bypass the CEL that will normally occur with catless DPs. You need a tune if you have catless DPs. JB4 can't and wasn't intended to correct the CEL.
I just clear the codes when it pops up. Usually only get the code when I switch maps once in a blue moon, maybe once every 400 miles or so. But I have some cheap o2 spacers which help.
Old 09-25-2024, 10:11 PM
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Hey I'm looking into getting a jb4 and bcm at the same time for my 2019 c43 coupe. Completeley honest, I've been looking through this thread and Im still soo confused. Do you think you can give any information on the install of the bcm? Can i do it all in my engine bay or do I need to access the underside for anything? Thanks man.
Old 09-25-2024, 10:15 PM
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Originally Posted by sdrutledge
MaverickC43 has it right. I did mine last week and the BCM goes exactly where the red arrow is pointing.

I had to take a couple pics with my phone to see the "pin 1" label since my old man eyes are limited.

Hey I'm looking into getting a jb4 and bcm at the same time for my 2019 c43 coupe. Completeley honest, I've been looking through this thread and Im still soo confused. Do you think you can give any information on the install of the bcm? Can i do it all in my engine bay or do I need to access the underside for anything? Thanks man.
Old 09-26-2024, 02:46 AM
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I’m not anywhere near the talent or knowledge of a mechanic. I’m just not stupid. I got everything installed from the top. Others may have better insight and advice. If I can get it done most others who want to can get it done too
IMO
Old 09-26-2024, 10:17 AM
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Originally Posted by MaverickC43
I’m not anywhere near the talent or knowledge of a mechanic. I’m just not stupid. I got everything installed from the top. Others may have better insight and advice. If I can get it done most others who want to can get it done too
IMO
I got you thanks. Is there anything specific you'd suggest knowing or doing a certain way if you were to install it a second time? I just wan't to make sure I know what I'm doing before I actually purchase everything.
Old 09-26-2024, 10:53 AM
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I would lay out the harness before connecting anything so u can see where the connections are and how u want to run the harness and wires in the engine bay

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