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2019+ BMW 3 AND 4-SERIES FORUMS (G2x Generation) General G20 Sedan / G22 Coupe / G26 Gran Coupe Discussions Canceling (bypassing) Li-ion aux battery in G20??

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      01-14-2025, 03:30 PM   #1
emir.
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Canceling (bypassing) Li-ion aux battery in G20??

Hi guys, let me explain what my problem is

so i have a 330i 2024 , unfortunately i had an accident and the aux battery relay closed and now its not functioning correctly,
Erorr code : 030D9A Relay jammed

I tried the methods on YouTube to turn on relay, it turns on and i hear it click but still gives same error , soooo why not cancel itit? Am currently driving without for a month
There is a (Drive carefully fault on kombi screen) and its annoying af
(Still got the old battery in garage )

My question is:
Has any one tried canceling the battery without giving any error
I know the main strugle is the LIN BUS connector that is giving the error

I would really appreciate if anyone can help to cancel the battery or repair it

I don’t have warranty **
Batterty production date 2023**
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Last edited by emir.; 01-14-2025 at 03:56 PM..
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      01-14-2025, 03:44 PM   #2
komoornik
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Why do you have a battery made in 2018 in a 2024 car?
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      01-14-2025, 03:45 PM   #3
Eljefe25
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It’s a 2024, why not take it to the dealer? Is it not under warranty? Or, since you said an accident, file an insurance claim?

I’m sure replacing the battery if damaged will not be cheap out of pocket. An insurance claim may be necessary.
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      01-14-2025, 03:47 PM   #4
emir.
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Quote:
Originally Posted by komoornik View Post
Why do you have a battery made in 2018 in a 2024 car?
Its a reference picture, its actually 2023 production
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      01-14-2025, 03:48 PM   #5
emir.
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Quote:
Originally Posted by Eljefe25 View Post
It’s a 2024, why not take it to the dealer? Is it not under warranty? Or, since you said an accident, file an insurance claim?

I’m sure replacing the battery if damaged will not be cheap out of pocket. An insurance claim may be necessary.
Unfortunately where i live we don’t have warranty, this is imported car
The only option i have is change it for 1000$ or try to fix it
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      01-14-2025, 04:03 PM   #6
emir.
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Btw
I tried keeping the battery as is in car, but as soon i connect the lin bus connector, the car gives error, battery malfunction
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      01-15-2025, 05:30 AM   #7
JD83
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I think for the LCI models that battery is for the mild hybrid system (do you have purple cable somewhere behind the engine?). If it is, I am not sure BMW would allow bypassing the battery, which disables the mild hybrid system. (Heck we can even no longer code to disable ASS)

If the youtube hacks for reconnecting the relay still gives out malfunction message, I would replace the battery.

If you drive the car without the battery, then the mild hybrid motor would not be operational and would it be possible the non functioning motor actually creating drag for other the drivetrain system?
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      01-15-2025, 05:35 AM   #8
emir.
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Quote:
Originally Posted by JD83 View Post
I think for the LCI models that battery is for the mild hybrid system (do you have purple cable somewhere behind the engine?). If it is, I am not sure BMW would allow bypassing the battery, which disables the mild hybrid system. (Heck we can even no longer code to disable ASS)

If the youtube hacks for reconnecting the relay still gives out malfunction message, I would replace the battery.

If you drive the car without the battery, then the mild hybrid motor would not be operational and would it be possible the non functioning motor actually creating drag for other the drivetrain system?
.
Actually the battery is used for auto start stop not has mhev (mild hybrid) but the big problem is the battery is self has a lin bus connector to dme
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