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Hello, I recently bought BMW E46 Coupe facelift, 2004. 150HP, and I have a problem that no mechanic can fix here.

I have factory xenon headlights installed. There are no aftermarket parts except new bulbs which are $25 Philips bulbs, they were changed both at the same time. I didn`t have any problems until now. It recently started turning my headlights off when I`m braking to stop. It turns off both xenon bulbs at the same time, for a millisecond and it turns them on again. It is NOT happening while: Driving, standing in one place, braking while im standing in one place. It IS happening while I`m: Braking to stop and while I was driving around in a roundabout and turning my steering wheel to the left. It is not because of the grounding wire in the backlights (i checked that because they said it might be a problem, on other forum). I switched ballasts and the problem is still there. Bulbs are bought 6 months ago. The right bulb sometimes flickers, but when i turn headlights off and then on, it stops. I doubt its because of flickering of the right bulb, this is something else. Can you please help?
 

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2006 325Ci M56 5MT
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Check the internal wiring, the Facelift coupe headlights especially the hid ones are notorious for having the wiring insulation breaking apart.
 
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2001 330i (5-speed)
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Check the internal wiring, the Facelift coupe headlights especially the hid ones are notorious for having the wiring insulation breaking apart.
What is internal wiring? Inside the headlight?
Where exactly are you suppose to look?
@Archbid Any details?
 

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2003 330cic, 2003 325iT
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If you remove the caps on the back you can see the internal wiring. Visually inspect for decay or damage. Also open the ballast housing and make sure the wiring has integrity.

It is almost certainly a bad circuit, but if both sides are doing it simultaneously, that suggests upstream at the LCM (or the aforementioned grounding issue)

You could also check the level sensors. Not likely, but they are affected by a change in the car's angle due to turning or braking
 
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