If your car shows antitheft on the screen of your head unit, remove the radio and copy out the serial number of the radio or use a diagnostic tool to read out the serial number , send it to me and we will provide you with the pincode for the radio. Most benz require special tools to input the pincode, if you can input it your self thats fine otherwise we can connect to your Star laptop over the internet and use vediamo to input the code for u.