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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 05-06-2005, 12:37 PM   #1 (permalink)
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Old 05-06-2005, 12:51 PM   #2 (permalink)
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I thought this would be a problem with these cars? The system reads the resistance or current through the bulbs normally. LED's would not give the proper reading. Adding a resistor across the terminals should fix it but why didn't the LED brake light manufacturer think of that?

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Old 05-12-2005, 11:30 AM   #3 (permalink)
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Originally posted by Gkamysz@May 6 2005, 11:51 AM
I thought this would be a problem with these cars? The system reads the resistance or current through the bulbs normally. LED's would not give the proper reading. Adding a resistor across the terminals should fix it but why didn't the LED brake light manufacturer think of that?

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thanks greg I will try that
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Old 05-12-2005, 03:06 PM   #4 (permalink)
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Be careful with this, too low resistance will burn fuses, while too small just won't cheat the computer. The wattage rating seems to be about 20W so this means a 7 Ohm resistor would do the trick. I personally would try the highest value resistor that still tricks the OBC.

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Old 07-25-2005, 09:54 AM   #5 (permalink)
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Hi greg tried 7ohms 10ohms &12 ohms no joy do I need to reset anything like disconnecting the battery?
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Old 07-25-2005, 12:48 PM   #6 (permalink)
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Don't disconnect the battery. The computer reacts when it notices a change. You can always just measure the resistance across the terminals of your stock lights while unplugged (or just across the bulb, I guess would work) and use a resistor that has a similar value. I would keep going down in resistance, but don;t take that as meaning that you should.
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Old 07-26-2005, 01:34 AM   #7 (permalink)
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Originally posted by drz328i@Jul 25 2005, 12:48 PM
Don't disconnect the battery. The computer reacts when it notices a change. You can always just measure the resistance across the terminals of your stock lights while unplugged (or just across the bulb, I guess would work) and use a resistor that has a similar value. I would keep going down in resistance, but don;t take that as meaning that you should.
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yoou could use a potentiometer.. a variable resistor...
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