RE: 2007 LEXUS LS460 PARKING ASSIST COLLISION WARNING SYSTEM. LEXUS 2007-09 LS460 CARS HAVE A REAR RADAR DISTANCE WARNING ALERT BEEPER WHEN BACKING UP. HOWEVER, ITS BEEPER IS LOCATED IN THE REAR OF THE CAR, AND ITS SOUND LEVEL IS TOO LOW TO BE HEARD BY MOST ELDERLY PEOPLE AND ESPECIALLY HEARING IMPAIRED INDIVIDUALS. THIS IS EXTREMELY DANGEROUS THAT MAY CAUSE SERIOUS INJURY OR DEATH OF SMALL CHILDREN PLAYING BEHIND THE CAR. I CALLED LEXUS NATIONAL CUSTOMER SATISFACTION AT 1-800 255-3987, AND THEY SAID THE SYSTEM IS WORKING AT DESIGNED AND THEY REFUSE TO AUTHORIZE ANY CHANGES OR TO INCREASE TO VOLUME OF THE BEEPER. THERE IS A FRONT BEEPER ALSO, BUT VOLUME IS OK. I HAVE TWICE BACKED INTO OBJECTS CAUSING DAMAGE, BUT THANKFULLY NO INJURY TO ANYONE YET. *TR