Welcome to Club Lexus, alltoyfam!
If the lights lower and then level out, I think it's ok to assume the motors work. It probably is a sensor issue, but I don't really know. I haven't seen anyone that has had issue with the auto-leveling yet.
The sensors are only on the rear. They are located on the rear control arms. I know member RamAirRckt posted a thread about them and headlight aim a while back. You may want to PM him for more info about them, as I haven't ever messed with them.
Here is that thread I was talking about