You have to Connect Mercedes Star Diagnose C4 (SDCONNECT) by LAN and WLAN and then can diagnose the cars & trucks. Please view the video to see how to do it. <br /> <br />The link is <br />http://www.obdmore.com/mercedes-star-diagnose-c4-sdconnect-with-xentry-das-wis-epc-p-165.html
