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Go Back   E46Fanatics > Tuning & Tech > Lighting Forum

Lighting Forum
Angel Eyes, DDEs, lighted rings, Clear Turn Signals, LEDs, Xenon, HID, or Bi-Xenon. If it lights up and you want to discuss it, post here!

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Old 03-06-2007, 01:51 AM   #1
force
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Xenon retrofit flicker when driving

I have retrofitted my bi-xenons and they worked for like a month, but now when I am driving the passenger one flickers on and off like every 5-10 seconds, the driver one also every once in a while. I never had my LCM flashed or anything because I never got any lights going on in the dash. When the car is parked and I leave the lights on, I don't have this problem at all. Any idea what could be causing this? Perhaps a battery or alternator problem?
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Old 03-07-2007, 02:06 PM   #2
force
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What does it mean when the xenon's first turn on and the red light with a picture of a car and a light goes on for a second? Is something broken? Is that just saying I turned my xenons on?
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Old 03-10-2007, 09:37 PM   #3
e.barr
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I think you will have to get the lcm flashed to stop the flicker, When the car is running a pulse of voltage is sent to each light so that the lcm can determine wheather the bulb is ok or not.
Because the xenon lights have a 35 watt bulb instead of the usual 55 watt halogen the lcm thinks that there is a problem and indicates this with the red car and light symbol on the dash.
Your lights flash because the xenon light is more sensitive to the pulse voltage than the halogens.

So get your lcm flashed and your problems should be sorted
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Old 03-12-2007, 02:40 PM   #4
Scott
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Quote:
Originally Posted by e.barr View Post
Because the xenon lights have a 35 watt bulb instead of the usual 55 watt halogen the lcm thinks that there is a problem and indicates this with the red car and light symbol on the dash.
Your lights flash because the xenon light is more sensitive to the pulse voltage than the halogens.

Um, no.

The halogen bulb has a FILAMENT and offers resistance, which is what the LCM is looking for. The HID bulb has no filament and no measurable resistance. The LCM interprets the lack of resistance as a burned out bulb and throws a dash error/reduced voltage.

Has nothing to do with a "pulse" or the wattage of the bulbs.
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Old 03-12-2007, 02:44 PM   #5
neejkoob
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Not sure if it is resistance...

I installed resistor packs on my P46 and it didn't do anything for the flickering...

BTW those resistor packs get really hot (burned my fingers)
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Old 03-12-2007, 03:07 PM   #6
Scott
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Originally Posted by neejkoob View Post
Not sure if it is resistance...

I installed resistor packs on my P46 and it didn't do anything for the flickering...

BTW those resistor packs get really hot (burned my fingers)
Well, a resistor pack is effectively just a dummy load. The current needs to go somewhere. It ends up as heat.

Do it the OEM way and get the LCM coded for xenons.
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Old 03-13-2007, 02:05 PM   #7
e.barr
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Ok Scott let me put it this way the LCM does send a small voltage measured in milliamps to the headlights/taillights etc every 30 sec or so (pulse) it then measures return voltage and resistance.
If you fit either xenons or LED's without reprogramming the LCM It will look for the correct return voltage and resistance if it does not receive the correct readings it will assume that there is a fault with the light/s
Red warning symbol on dash

Its this "pulse" of voltage that gives you a flikering effect with the xenons and the LED taillights.
If you have ever seen a car fitted with OEM LED tails and with an unprogrammed LCM you will see once the Ignition is switched on that the tails fliker like a christmas tree and then stop for 30 sec then start to fliker again, the LCM test pulse voltage is enough to operate the LED lights.
The same thing happens to the xenons thats all Iam saying
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Old 03-14-2007, 06:06 AM   #8
Titansilber330D
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I added a 4700uf 25v capacitor as detailed in this thread http://forum.e46fanatics.com/showthread.php?t=366215

Solved the bulb out warning and flickering I had before.
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Old 03-14-2007, 11:49 AM   #9
neejkoob
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I second...

I picked up two 4700uf 35v capacitors at radio shack and it did the job...flickering and dead bulb warning...GONE
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