Air Bag On-off Switch problems of the 2004 Lexus ES330

I have a Lexus 330 model year 2004 4 door sedan. The car has an indicator on the dashboard advising whether or not the passenger seat airbag is turned "on" or "off". This dial indicates the airbag is always turned "off" if a person weighing less then 85 pounds is in the front passenger seat. When an 85 pound female is in the front seat the air bag warning light indicates the air bag is turned "off". If the passenger places a 10 pound bag of potatoes in her lap, the airbag indidator shows that the airbag is turned "on". I purchased a car with 2 front seat air bags. However, this in not what I have received. There is no manual switch to turn the air bag "on" or "off". The dealer and Lexus corporation refuse to correct this so that my 85 pound wife is protected by an air bag. Does this comply with your regulations? very truly yours, jules I. Kurz.