It very much needs to calibrate first. This could take between 30 mins and an hour. The way to activate it is when driving over 20mph or so depress the gear shift fully down twice in rapid succession. you should hear a two-tone bell time chime ding-ding. To my recollection, if it doesn't work there will be a ding-ding-ding much faster. You'll also see on the monitor a highlighted speed limit sign. Also review in the owners manual using EAP, activating etc. Further, once it's activate unless you turn on it's functions like lane keep or others, it won't do them. The online (or pdf) manual is your friend.