Hi, I've got a true serial (on COM1, no usb conversion) to OBD cable and have had no luck connecting. My car is not D-Can (E60 built in May 2006), but when I connect via INPA, neither circle is black. The light on the OBD connector stays solid green when connected to the car. It is like INPA can't see it. Any ideas on how to make the connection?