How do you adjust the headlights on a bmw 523I

The adjustment screws/nuts should be located either on the top of the headlamp assembly, behind the headlamp assembly, or near the frame rail by the radiator support.

You will have vertical adjustment screws for each independent beam (separate highs and separate lows, but will be same screw if highs and lows are the same bulb). You may also have additional horizontal adjustment screws as well

Park your car on a level ground 30 feet from a wall and measure the height from the ground to the bulb and mark on a wall (do this for highs beams and low beams if the bulbs are separate, if highs and lows are the same bulb, only do it for the lows)

For Low Beams: If the headlights read VOR, then aim the brightest part or cutoff part just below the mark on the wall. If it says VOL or nothing, aim them 2 inches below the mark on the wall.

For High Beams (if separate from low beams): Aim the headlight directly at the line you marked on the wall.

on top of the headlights there a place where you see a plastic long phillips size screw driver and turn it left or right how you need them ajusted,if this info was of any help to you then please leave a comment ,thankyou.

i have never done it on that particular car. but usually open the hood and on the top of the head light (towards the back usually) there is a bolt or screw and sometimes there is even a bubble leval to help you out! if you just take a peak in there you should be able to see it