No it's not - I have been in 4lo multiple times in my 08LX - no beeping at all.
Is it beeping when in 4lo or when to try to engage 4lo?
Just when I place it in 4LO I have not tried to drive yet, I will do that today and report back. Also have a problem with the parking sensors they are on but not working. I will get the BIG book out this afternoon and see if I can figure it out.
Ran the 570 back to the dealer, the beeping only happens if you flip the switch to 4L and the car is not in neutral, once in neutral flip the 4L switch and no beeping, works perfectly. The Parking sensor was working as well but would not warn until you are about 1.5 feet from the front sensors and about 3-feet with the back sensors.