I have attached instructions for anyone that is interested.
The adjustment controlled by the sensors is relatively modest compared to the adjustment that occurs when I turn on the high beams. However, it may prevent dazzling on-coming drivers on hills.
Here's a link showing the operation:
http://youtu.be/YGkfebCCf2Y
In sequence I do the following:
1. Turn on the lights with the ignition switch on - the lights go through their self-leveling routine
2. Switch on the high beams and the Xenon low beams swivel up
3. Switch off the high beams
4. Slightly raise the front of the car using a jack
It seems that the beams swivel down slightly, but not as much as I expected. It also seems that after a relatively short range, the lights don't adjust at all.
I'd appreciate hearing whether others think this is proper operation.