I have bought a tech 2 serial lead off ebay at a risk of £30. The software that came with it is the TIS2000 and tech2 diagnostic software. My usb to serial lead works perfectly however the light on the tech2 unit does not come on when connected to the usb cable and the car. The power supply on the diagnostic port is there and the paperclip test works ok, showing the diagnostic port is working ok.
Does anyone know any tests i can carry out to confirm the tech2 is or is not knackered.