Yes, it's deactivated when it drive and over a certain speed.

It can be manually activated and deactivated when sitting still by pressing the PDC button.

I also think it's easier to walk around and listen than it is to boot up a computer, connect a cable, navigate through programs. Takes 30 seconds to walk around the car listening to each sensor.

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Current Bimmer
2004 X5 4.4i Sterling Grey Sport/Premium

Past Bimmers
1991 318I Alpine White
1995 740I Alpine White
1991 525I Schwartz
1998 323IS Scwartz
2004 330CI Cabrio Titanium Silver Metallic
1995 540I Schwartz
2000 Z4 3.0 Titanium Silver
2000 330ci Coupe Titanium Silver