I tend not to use my key fob to open my trunk that much. After looking through my manual I couldn't find a way to disable the key fob button to open the trunk and keep the button in the cabin working. I suppose going into the car's computer could do it, but I'm not the computer hacking type.
What I have here is a simple, fast and easy, fully reversible way to disable any button on a key fob.
My car is a GM, I know other brands use a similar system, but your car may vary.
Materials: Little bit of plastic bagging
Tools: Scissors, coin, brain, hands.
Step 1: Theory
The buttons on a key fob work by having a conductive pad touch an open circuit on the Printed Circuit Board (PCB) and therefore close it. All that has to be done is stop the circuit from completing. We need an insulator between them to disable the button.