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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 07-22-2014, 12:51 PM   #1
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Join Date: Jul 2006
Location: San Francisco
Posts: 171
My Ride: 2003 330Ci
I think I made the BMW gods angry

I did the victory dance last night. Evidently the BMW gods don't like cheap easy fast fixes for problems, let alone celebrating them.

I was made aware on Friday by my local mechanic that the passenger Xenon bulb was out. When I got in the car I was surprised to see that there was no bulb out light on the dash. I ordered a new OEM Osram bulb and it showed up yesterday. Spent a few minutes putting it in, and it didn't work. I decided to unplug the power to the ballast and repluged it in. BAM the lights comes on. (Might brighter than the other side, I probably should replace the other one too..)

I did my little who-hoo that was a cheap fix. When I turned the car back on to move it inside the light was off. Crud, I had a bad feeling from the get go, and this confirmed it. This morning I pulled out my multi-meter since I had more light and started to diagnose whats going on. The following is what I measured

1) Both lights receive 10.2 volts power to the ballasts (I think thats fairly low, I had to jump start the battery this morning. I do attribute that to sitting with the lights on without the engine running.

2) Both hi-beams work

3) There is no voltage going to the bulb terminal for the Xenon.

So I'm obviously thinking it could be the ballast or ignitor.

What I'm really kind of dreading is that its the LCM. Something is telling me thats what I'm going to discover is the problem. If the LCM was fried, could that cause one side to be out (even though there is voltage going to it).

I'm debating if I should just bite the bullet and buy a used light, or a ballast /ignitor combo.

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Old 07-22-2014, 02:31 PM   #2
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Join Date: Jan 2013
Location: Norman, OK
Posts: 615
My Ride: 2002 325CI
I would replace the battery first. It may sound dumb but a bad battery will cause all types of weird problems. And if it is going bad you will have to replace it eventually. Your headlights should be able to stay on awhile without the car being on.

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Last edited by philliplong; 07-22-2014 at 02:32 PM.
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