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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 02-16-2006, 11:59 AM   #1
paraklas
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LCM (Light Control Module) Transplant

I have an E46 320ci date April 2001. I have also bought the OEM LED Tail lights. As far as I know I will need either a new LCM or do the trick with the resistors/capacitors described on other threads here.

A friend of mine gave me an LCM from a 2004 BMW wich had LEDs and Xenons installed.

I noticed that the LCM I have has two buttons for front and rear fog lights and a jog dial to vertically move up and down the front headlights while the new LCM only has one button for fogs and no jog dial.

I've seen that the front face of the switches on the LCM connects with the rest of the board using a removable ribbon cable. If you remove the ribbon cable, you can separate the front faceplate with the switches from the rest of the LCM board (which the LED/Xenon programming is)

Can I just take away the front switches/face of the new LCM and connect the switches/face of my LCM? Will it work? Anyone done it?

Thanks
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Old 02-16-2006, 12:19 PM   #2
kerisabe
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I thought u can't use a USED LCM ? Cause it recorded the mileage of the origin car etc2.
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Old 02-16-2006, 02:11 PM   #3
Ivegotissues666
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Quote:
Originally Posted by kerisabe
I thought u can't use a USED LCM ? Cause it recorded the mileage of the origin car etc2.
Switching the faceplate won't work, you will still need the ECU flashed for LED tails and xenons. The faceplate swap will only work for front fog lights.

I mean you can try it. It won't display the tampered symbol in the cluster by just switching the plate but your car would still need to be reprogramed for what you want to do.

Jared
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Old 02-16-2006, 03:20 PM   #4
H!GG!NS
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Where is the LCM located? and how is it removed?

Is it just the headlight switch with the long backing?

Please help, I did a search and I couldn't find any DIY's.
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Old 02-16-2006, 04:44 PM   #5
paraklas
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I see.. Thanks for the info.. So, basically, I could just flash the ECU and use my original LCM right? Or the LCM needs recoding as well? I thought that only LCM needs to be programmed for LED/Xenons.

Last edited by paraklas; 02-16-2006 at 05:04 PM.
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Old 02-17-2006, 08:28 AM   #6
BMWBoiDE
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No, your original LCM won't work. It needs an updated LCM, then it needs to be flashed to program in your cars settings (mileage, daytime running lights on or off, LED tailights, etc). I did the LED tailights on my car and it also had an April 2001 build date. Part number is 61-31-6-936-834. Retails for about $283.00. Everything works perfect.
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Old 02-17-2006, 12:12 PM   #7
paraklas
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So it seems I'll use the newer LCM and have it flashed with the necessary data.

Thanks for all the info
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