These are the logic states of the sensors:
Input A Seat belt fastened = Logic 1
Input B Door closed = Logic 0
Input C Secret switch pressed = Logic 1
Output Q Drives relay which allows the motor to start the engine when the ignition is turned.
There is then a diagram which looks a bit like this
And you have to complete the diagram. Can anyone explain the whole logic thing or give me a link to somewhere as its really important. Thanks!