Sunyou&reg; VAG-COM KKL 409.1 OBD2 USB Cable Auto Scanner Scan Tool For Audi VW SEAT Volkswagen This cable may not work if your car uses a protocol / bus system like VPW, PWM or CAN-bus. Terminal K = Bus of communication Terminal L = Ignition for waking up car computing system (ECU: Engine Control Unit) This K/L Diagnostic interface & cables work on ISO/KWP (Key Word Protocol) launched after 1996 only. Existed 3 different protocols with same OBD2 connector incl. ISO/KWP, VPW, PMW