Hello dear Moto-Talk community, I am Felix and drive a Smart 451 CDI 2008 convertible. I need your help please. I received his used cruise control from a friend. I installed this one today (reinforcement kit Misterdotcom). Everything like in the original guide wired. Foot switch, tacho, steering wheel switch. When I wanted to start the vehicle, it unfortunately didn’t start any more. Then I jammed the battery for 5 minutes, unfortunately without success. So everything was built back on original. Then the shock…it still didn’t start. Then I wanted to read out the error, but my OBD interface no longer sends any data (voltage is on, can connect myself via Wlan, but get no access to the control units). The switches for my cover also have no function (on/to) either. Only with the key I could open the cover yet but unfortunately not close it. The gear indicator is also no longer visible in the display. I have the fear that I somehow destroyed a control device. If I put the back light on the display, I have no idea in the back light.