Headlight Trouble

[TerminatorX5]

Originally Posted by X5SND

Interesting.....

Initially I was going to say motor issue, because it look like it doesn't "know" where its going....but yet it centers itself on the next key cycle right? I don't have that much experience when it comes to these kinds of motors---T, is it possible that the motor can tell where it's start/end points are, but gets confused anywhere in between?

this thread is moving in waves - no posts and then everyone start to type at the same time, so i have to go back several times to get the whole picture of what is being said...
the light assemblies have a sensor that indicates position of the pivoting projector in relation to the stationary housing, the AHL is being programmed to recognize that location as "zero" at the end of the assembly line (i guess when the car is being calibrated for the wholesale delivery to a dealer) and not entire physical range of the headlight is being used for the entire motion of the projector...

so, yes, the system knows where the starting point is - that brings us to GT1 tool... GT1 supposedly is capable of testing each projector individually... I don't think Chris has a GT1 laying aroung his garage...

[TerminatorX5]

ahh... you answer before i even have a chance to type up a question!!!! lol...

[TerminatorX5]

i am reading up about it on the russian sites - they have much more info, and i am still digesting it...
it seems that if there is a mechanical malfunction, the system will try to bring the light into "park" position, and upon failure of doing so, will point the light down... that is what we see... however, on the power recycle, the light is starting out from the initial parked position... i did not come up to this symptom yet... there are also the dates, when certain modules were integrated into each other, and when behaviour was changed - so much to digest...

also, the WDS does not list location for the AHL module - i would think it will be in the glove compartment but I don't want to send Chris on a wild geese chase to change the pins...

[TwinsPoppa]

It might be the control unit mounted under the headlight next to the ballast.

Number 5

[chrissoto312]

Originally Posted by TwinsPoppa

It might be the control unit mounted under the headlight next to the ballast.

Number 5

Awww Hell.......And there's probably no easy way to get to it either?

[TerminatorX5]

here is a similar post on the motor failure in the headlight... i think your motor is still good but you may have a nick or broken tooth on the worm drive or the gear...

http://www.xoutpost.com/bmw-sav-foru...ht-motors.html

the AHL module is behind the glove compartment - I could not pin point it, if it is actually behind the compartment or next to the LCM on the passenger side A-pillar... in either case, if we need to dig into the AHL module, the glove compartment will need to come off in order to gain access to the modules...

Can you look up the instructions for the glove compartment removal?
the AHL module part # 61356934837

should you find the AHL on your own, while i am still researching the issue, the module has only one 18-pin plug. to make a swap, you will need to remove the pin 2 and insert it into slot for pin 3, and remove pin 3 and insert it into the slot for pin 2.
Also, you will need to remove the pin 17 and insert it into slot for pin 18 and remove pin 18 and insert it into slot for pin 17. thus, the two pairs can be switched... this is rough info, you probably will ned details on how to remove the pins, how to take the plug apart...

I still think, the problem is inside the headlight, with the motor or the gearing...
i am still reasearching this...

[TwinsPoppa]

Too fast for me. I found this LOL

http://www.xoutpost.com/bmw-sav-foru...ease-help.html

[TerminatorX5]

Originally Posted by TwinsPoppa

Too fast for me. I found this LOL

http://www.xoutpost.com/bmw-sav-foru...ease-help.html

hahaha
bingo - location of the AHL module!!!

[X5SND]

Can the adaptive start-up procedure be done without starting the car....by turning the key to pos 2?

Reason I ask, (RB also asked this earlier but seems to have been missed) is if you can hear any growling (or something like gears getting stuck) coming from the front.

Try this:

Roll down drivers window, get out & close door.
Standing outside the X, turn the key to pos 2 (the position the key returns to after cranking), and then listen carefully to the sound the lights make. You should be able to hear the motors when they move (a slight hum). It also helps to turn off the HVAC and radio as well....of course if you HAVE to start the truck this isn't going to work. But, any growling usually indicates either the motor is toast or something is getting hung up/jammed.

[TerminatorX5]

Originally Posted by X5SND

Can the adaptive start-up procedure be done without starting the car....by turning the key to pos 2?

Reason I ask, (RB also asked this earlier but seems to have been missed) is if you can hear any growling (or something like gears getting stuck) coming from the front.

Try this:

Roll down drivers window, get out & close door.
Standing outside the X, turn the key to pos 2 (the position the key returns to after cranking), and then listen carefully to the sound the lights make. You should be able to hear the motors when they move (a slight hum). It also helps to turn off the HVAC and radio as well....of course if you HAVE to start the truck this isn't going to work. But, any growling usually indicates either the motor is toast or something is getting hung up/jammed.

the headlights go through POST (power on self test) regardless of the lights on or off, upon the key in pos 2... to repeat the POST, the car needs to be turned off for at least 15 seconds, then POST repeats again with key in pos 2.