I realize I'm resurrecting an old thread but I wanted to share some info for anyone who might be looking to disable their auto-leveling headlights in the future.
I was able to remove the bumper fascia without breaking the 3 clips in the wheel well. I did so by opening the access panel in the wheel well liner and squeezing the clips, then pushing the fascia back away from the fender flares. I did this after removing all the other bolts and clips from the fascia.
However, I believe that removal of the bumper fascia is actually unnecessary. After removing the headlight, I realized that the access panel is actually on the inboard side of the headlamp assembly, not on the bottom. The AHLM module can be removed without pulling the headlamp assembly. After removing the grill (pull the plastic clips on top and lift straight up, gently), a torx bit and appropriate size wrench can be used to remove the metal cover. Remove the module, disconnect the plug, protect the plug with electrical tape, replace the module and you're done.
Using this method you should be able to disable the auto-leveling feature in <10m without risk of breaking anything. The part number on the assembly is 55079008AG and can be read through an opening in the metal retainer panel to confirm you are pulling the proper module.
Many thanks to tfgnt16 for discovering how to disable this without throwing codes or causing issues with the HID lights themselves.
'09 XK Ltd - 5.7L, QDII, OME HD
(retired) '99 WJ Ltd - 4.7L, QT, Upcountry