well if you dont have that thing with the red LED and the mic then you don't

 

Gonna try to find my box today... having the same deal as you guys, no sensativity... If I can't find it where exactly IS that ECU box the dial is on?

 

mine is on the passenger side behind the glovebox attached to the wall right there on the left.

but my friends was supposedly on the other side, i would guess at about the same area only on the opposite side of the car...