GLS is unlikely to have self levelling shocks, and besides, these would not stop headlight aim from not working.

Some cars have Xenons/HIDs which do automatic beam levelling, but very unlikely on yours.

Is it both headlights that don't adjust, or just one...

The sure fast way f telling if you have self leveling is to look under the rear of the car, there should be a level sensor on the drivers side rear trailing arm near the diff (not ot be confuse with HID sensors on the passenger trailing arm near the hub).

You might also be able to spot some small pipes to the rear shocks.

As for the headlight leveling.....they should move when the dial is turned as the are independent of the self leveling. Given that both are not moving the chances are its the switch, the only other possabilities are that the motors have been disconnected or HIDs have been fitted (unlikely).

I asume F22 is intact (assuming the wiring hasn't been butchered then if it wasnt one of the headlight bulbs would not be working)

I think that you can rule out the motors as they would need to ahev simultaneously failed for both not to work.

To remove the light switch, get some butter knives or simialr an insert them either side of the light switch, if you wiggle them(or look carefuly down each side) you will be able to see/fell the two metal springs, use the knives to push them towards the switch.

Now pull the switch from the panel, easiest place to get hold of it is along the bottom edge.

It might be that the switch has been taken apart before and that the dial guides have not been correctly engaged in the level switch...