If your 90 translates to the U.S. 75 mph when the beeping starts than your computer has been programmed to give you this warning beep from 90 & above. You'll need someone with a DRBIII to pull up your personal settings to see if the speed warning beep is activated or not. If so they can de-activate at the same time & you'll never hear this beep unless it is re-activated thru the DRBIII. One of the little querks about our cars. There is no other speed that this beep can be set to start alarming you. It is either on (75 mph) or off no beep ever. The only problem is it will cost you an hour labor charge if you don't have access to the DRBIII. Good Luck.