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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 01-26-2013, 09:36 PM
MilosFreeM3 MilosFreeM3 is offline
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Location: TPA - FL
 
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Mein Auto: 2004 M3 SMG
Arrow Changing fog lights to LED DRLs

Changing fog lights to LED DRLs:

Looking for help from my fellow-BMW enthusiasts.

Loyal for 17 years to BMWs I went to the dark side as I could not resist a great
deal I found on my current 2009 SL550. No worries - my E46 is still in our garage
and coincidentally just tonight we broke 100,000 miles after 9+ years together.
BTW, my wife is thrilled that she ‘inherited’ the car from me 2 months ago ;- )

I liked everything about my car and was not thinking about doing any mods until
I saw a picture where someone successfully converted fog halogen lights to more
modern LED DRLs. My installation went without a hitch and I was very happy
with the overall look and execution. But we are not ‘home free’ just yet.

Since the wattage is lower on LEDs – as we expected, the lights are causing errors
on the dash board. Worse yet, they are not operational yet and are only giving
out some blinks and flashes every so often. My installers expected this and had
a few resistors ready to ‘fool the computer’ that the current is as it should be.
They tried 4 different values, but this only accomplished flickering and different
intervals. No steady-on light and of course – the errors are still on my dash.

I know that MB SLs are not cars that are modified extensively, so I am turning for
help from any car enthusiast that can shed some advice or suggest that I contact
someone (shop / company with accessories?) with knowledge and necessary parts.

Thanks in advance for any input...
(sorry this is not directly BMW related, but I was hoping that the same folks that
know how to overcome these challenges, would know it regardless the make & model)

http://i229.photobucket.com/albums/e...conversion.jpg
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  #2  
Old 01-27-2013, 03:22 PM
HPIA4v2 HPIA4v2 is offline
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You'll need to put the resistor in parallel, across the light bulb terminal. I'll say 1W 240-ohm resistor will do. It really to fool the LCM to think there is incandescent bulb across the terminal.
If this still fail, I'll put the original bulb in place to reset the computer then switch it back to LED. Unless you have a good reset tool like GT or auto-logic to reset lightbulb burn message.
GL.
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  #3  
Old 01-28-2013, 08:14 PM
MilosFreeM3 MilosFreeM3 is offline
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Quote:
Originally Posted by HPIA4v2 View Post
You'll need to put the resistor in parallel, across the light bulb terminal. I'll say 1W 240-ohm resistor will do. It really to fool the LCM to think there is incandescent bulb across the terminal.
If this still fail, I'll put the original bulb in place to reset the computer then switch it back to LED. Unless you have a good reset tool like GT or auto-logic to reset lightbulb burn message.
GL.
Thank you for your reply.
Just curious - how did you come up with 1W 240 Ohms.
The OEM fog lights are 55W. I am just curious if the math makes sense for 1W/240 Ohms in place of 55W bulb.
NOT doubting you - just curious about the formula. I used to be able to calculate this - but this was many, many years ago
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Old 01-29-2013, 07:09 AM
HPIA4v2 HPIA4v2 is offline
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Quote:
Originally Posted by MilosFreeM3 View Post
Thank you for your reply.
Just curious - how did you come up with 1W 240 Ohms.
The OEM fog lights are 55W. I am just curious if the math makes sense for 1W/240 Ohms in place of 55W bulb.
NOT doubting you - just curious about the formula. I used to be able to calculate this - but this was many, many years ago
I am guessing most of it, but the idea is to at least provide at least 20mA draw current (12V/240ohm ~ 20mA) for LCM (light control module) to sense there is resistance there, fooling it to think there is good light bulb there. But also dissipate very small amount of heat about 20mA x 240-ohm ~0.5Watt when your LED is on, don't want to design a space heater inside your headlamp nor loading up the LCM either.
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  #5  
Old 01-29-2013, 07:28 AM
MilosFreeM3 MilosFreeM3 is offline
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Thanks for the explanation. Much appreciated.
M.
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  #6  
Old 01-31-2013, 07:23 AM
MilosFreeM3 MilosFreeM3 is offline
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All good now. Someone recommended a really good car stereo shop.
I took the car there and they had everything figured out in one hour.
They were able to calculate the correct load resistor and now there are
no error messages on my dash board. The LEDs are hooked up to the
original fog light circuit so I control them with my fog light switch.

Thank you for your replies !!



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Last edited by MilosFreeM3; 02-01-2013 at 08:26 AM.
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  #7  
Old 01-31-2013, 09:46 PM
heztheone heztheone is offline
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looks great
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  #8  
Old 02-01-2013, 12:52 PM
E92-Lighting's Avatar
E92-Lighting E92-Lighting is offline
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Mein Auto: 335i
looks great, we have CREE fog lights as well now
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