megane ii key card problem

iv got a megane ii with a faulty key card .it locks/unlocks the car iv dismantled the card and the coil with the 3 pins on that solders to the circuit board .the pin on its own is not connected to the board so I removed the coil and there's nothing for the pin on its own to connect to the board if you get me lol .the other two have a silver bit on the board but theres nothing on the single pin ...has any one fixed this with a similar problem to me .thanks