Ensure the car's ignition is on; the cable requires power from the vehicle's OBD-II port to be "seen" by the software.
If you see (Windows cannot verify the digital signature) in Device Manager: how to install vag kkl 409.1 on windows 10
VAG-COM 409.1 and VCDS-Lite usually require the cable to be assigned to COM1, COM2, COM3, or COM4 Right-click the button and select Device Manager Ports (COM & LPT) USB-SERIAL (or similar), right-click it, and select Properties Port Settings Change the COM Port Number to an unused port between COM1 and COM4 (Optional for FTDI) Change the Latency Timer (msec) for better stability. 4. Software Setup (VCDS-Lite) Ensure the car's ignition is on; the cable
📌 How to Install VAG KKL 409.1 Cable on Windows 10 (32-bit or 64-bit) Software Setup (VCDS-Lite) 📌 How to Install VAG KKL 409
For FTDI chips, download the latest setup executable from the FTDI Chip Drivers page .