4 or 6 pin OBD-2 adapter cable for use on Harley-Davidson motorcycles. This adapter cable converts a standard 16 pin OBD-2 plugs into the 4 and 6 pin Harley-Davidson OBD connector, for plugging into the motorcycle diagnostic socket. The cable is for Harley-Davidson motorcycles with VPN or CAN bus protocol. So before and with CanBus system Just look at the diagnostic connector itself how many pins it is.