What does this button mean

[v0n]

In one of our cars there is this suspitious looking button under steering wheel column which doesn't seem to be doing anything when pressed.

Anyone know what is it supposed to do?

 

[v0n]

It's a Nissan. Nissan Largo, japanese import MPV which my brother use as van. The car has no folding aerial or tow bar, steering column is adjusted manualy with traditional handle under column. This button is out of sight, below steering column, next to break release handle. It clearly works up and down, but there is no sound or movement inside or outside when pressed. I saw similar button once before in a Terrano R3M, but picture was more aerial like without being so "in your face" fallic. It was for extending TV aerial from bumper. But this car has no TV, or additional radios, or holes in bumpers. I'm genuinly puzzled.

 

[v0n]

If its like the button in my 206. If you press it before you exit the car, it will disable the motion alarm for when you lock the kids/dogs in there and still enable you to use the central locking (which also activates the alarm on my car).

But wouldn't it be press in, press out button? This one has up and down arrows?