what's this button for?

ok i got a 94 cx hatchback, on the left side of the parking brake console there is a "on" and "off" switch. what the hell is it for? i turn it on, nothing happens, i turn it off and nothing happend again. can anyone help me. i think the person might have modifired the car who know( when i got it on the gas cap door it has a "taz" with gas container that says "jet fuel only" and it has a J&N filer sticker on the engine bay by where the filter would have been) can anyone tell me what the button is there to do? or what is is supposed to do. oh i already read the owners manual and found nothing