PDC Behavior Question

[thrillcat]

My PDC seems to be working correctly, as far as telling me when something is close, front or rear. My question is, though, should it turn off once I put the X in Park?

Example, when I back into the garage, the beeping is nice to gauge if I'm far enough in to clear the door (when the front stops beeping, I know I'm past the door). But once I put it in Park, I'd rather it stopped beeping. I'm not going anywhere at that point.

Is this normal, or is there something not right with my system, or is it something that could be modified in the system?