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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999

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Old Fri, Jul-30-2010, 12:39:18 AM   #11
Supered ///M
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Originally Posted by Sirius View Post
It was my understanding that the light checks done by the OBC registered high resistance or infinite resistance (which is what would happen to a burned out bulb as the inert gas inside the bulb will offer a much larger resistance than an intact filament) as the error. The same is with the case of HIDs as they don't have an actual filament which results in a 'high / infinite' resistance reading.

So, how does adding a resistor fix this?

Also, OP... the last I checked LED's do not have resistors built into them directly. Maybe small ones for the circuit board, but not on the actual lamp.


Oh, and my 'fix' for my headlamp code (or any other error) is the TEMP button.
IIRC, our cars work by measuring a range of resistances to determine whether or not to throw a code. Too little resistance, in the case of an LED bulb, will measure too high outside the range of resistance. Similarly, bulb out will not measure a current, and throw a code.

OP, the best thing I think you could do is measure the resistance of the bulb using an ohmeter and then work backwards. Wire a resistor in series with the bulb (as previously suggested) that will give you a current reading similar to what you would get with a normal bulb.

One thing I did for my ZKWs (because I use a PnP switch with a relay to activate the lights) was wire a resistor between both + and - wires to resemble the draw on a regular headlight. A relay will draw on the order of milliamps and you need something on the amps to stop the OBC from tripping.

Obviously your taillights might draw a different resistance than headlights, so I can't say for sure what resistance you should use, but probably no bigger than 12 ohms.

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Old Sun, Aug-08-2010, 01:26:05 PM   #12
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Originally Posted by propchef View Post
The OBC can be reprogrammed to to skip the check process. But keep in mind that is will cancel not only the tail check, but headlight check and washer level check too. Probably a few other things as well. I was just reading about this process yesterday. This might be too extreme for some, but I just mention it as an option.

At your own risk:
Just what I was looking for. I ran it and I have no more codes!
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bulbs, code, led, light, trip

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Discussing LED bulbs trip light out code? in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)