[firetruck41]

We had a guy that didn't wear his seatbelt on trails near his house, he got ejected when he got too close to the edge of a drop off, when his 4wd rolled, his head was crushed between the vehicle body and a large rock. He is dead.

But hey, I know what you mean about listening to music with doors open while parked. Not familiar with the FJC but if it's like other vehicles, I think you could wire in a manual switch in line or in place of the door switch, to connect/disconnect the circuit, thereby fooling the vehicle into thinking the door is closed.