The height control only changes the height of the car a little -- about an inch or so. It is so small you probably can't tell the difference without measuring it. I was able to see mine work by turning on the headlights and flipping the switch while watching the lights against the garage wall. Also, it takes about a minute for the air pump to raise the height after it is activated, so give it time to work.
Lexus will send you a replacement manual for free. Give them a call or send them an email and ask them to send you one. I got another one for my car because I like to carry one with me as well as having one in the house for study. The car is far too complex to figure out without reading the books.
Hope this helps.
Sean
