Xenon Power-on Self test?

[pheller]

Just curious, do the Xenon headlights perform a power on self test each time they are turned on? (i.e., point the whole way up, the whole way down, then return to the normal position)

[plien69]

Yes, they perform a leveling self-test each time they power on.

[OrientBlauZHP]

Originally Posted by pheller

Just curious, do the Xenon headlights perform a power on self test each time they are turned on? (i.e., point the whole way up, the whole way down, then return to the normal position)

Welcome to BMW; yep every time you turn them on.

[Oregon]

Originally Posted by plien69

Yes, they perform a leveling self-test each time they power on.

Thanks. I wondered what the lights were doing when activated. This forum and you guys are awesome.

[RobLS]

I love it

[rcracer_tx]

Yeah, my Porsche does that too. It's always a good conversation starter when i have a passenger. most people are like :w00t:

[plien69]

I believe all Xenon lights are required to be self-leveling by law, at least in Europe. Not sure about the US/NA.

In my E46 M3, the bi-xenons leveled themselves as you drove. You could see the top cutoff adjust up and down as you went over crests, speed bumps, etc. I haven't driven the 135i enough at night to notice if it does this as well.

[Thud]

Nice feature. The lights also aim right/left around turns.

However, it's another moving electrical part that can break!