HELP retrofit 2017-2022 Interior Dome Light wiring colours

samrex

New Member
Jan 23, 2023
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Hi Guys I need some help PLEASE and dont know where to find it.
I need to know the wiring for this rear cabin light from the 2017-22 BMW F90 M5 G30 G32 GT G11 G12 G01 X3 G02 X4 series
BMW Part number 43684861401 or 6848614
I want to retro fit it to a old school muscle car so need to know what each colour wire does and if I can simply run this with 12 Volts and earth etc or what is needed to get this to work off the switches on the light.
Attached are some pics and all the info I could find but it doesnt tell me which wire is which.
There are 4 wires and from memory they are
Red with yellow stripe
Black with grayish stripe
Purple
Purple with white or grey stripe
colours may be a little different to what i have mentioned as i am working of a pic i took
Help would most appreciated
 

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samrex

New Member
Jan 23, 2023
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Is anyone able to help me work out how to get this to work alone with its switches so i can use it in another car PLEASE?
 

KClemente

Sergeant
Nov 26, 2019
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Ride
E90 335i
Pin 1 (brown) goes to ground, Pin 3 (red/yellow) goes to switched or full time 12v.

Pin 2 looks like it maybe (?) be a terminal 15 wakeup from the BDC. And pin 4 just connects straight to the BDC with an unknown function.

See if wiring pin 1 and 3 has the desired results
 

samrex

New Member
Jan 23, 2023
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Tried that and sadly nothing happened.
Also tried 30B as this has come up on Google searches as a power source and again nothing.
I even tried bridging the 2
(Lin bus wire and the 30B wire to power and then 31L to earth and nothing.
I don't know what to try next but if someone could help that would be great
 

samrex

New Member
Jan 23, 2023
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Is there any one that might know what to do or where I can get this info from to make this work please?
 
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Davecara

New Member
Jul 8, 2023
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1689151632225.png

Pin1 Brown is groud obvs
Pin2 Grey/Violet to BDC pin 41 A258*4B
Pin3 Red/Yellow +ve from Fuse 62 5amp
Pin4 Violet to BDC pin9 of connector A258*3B

Pin assignments at plug connector A258*4B​

41E/ALIN bus signalBus connection

Pin assignments at plug connector A258*3B​

9AActivationInterior light, rear

Hope that helps ya @samrex
 
Last edited:

samrex

New Member
Jan 23, 2023
7
1
0
View attachment 83257
Pin1 Brown is groud obvs
Pin2 Grey/Violet to BDC pin 41 A258*4B
Pin3 Red/Yellow +ve from Fuse 62 5amp
Pin4 Violet to BDC pin9 of connector A258*3B

Pin assignments at plug connector A258*4B​

41E/ALIN bus signalBus connection

Pin assignments at plug connector A258*3B​

9AActivationInterior light, rear

Hope that helps ya @samrex
Thanks alot for this info as it clears up all my assumptions.
BUT I would love to know if/how I can make this light work separate out of the car as I wan to use just this light in a totally different car from pre Lin bus era.
Is there a way to simply connect Power and earth or some kind of work around to make this light function?
Thanks again