i have a 95 altima that just yesterday started making a non-stop clicking noise when in the on or start key positions. i took apart the dash/tapedeck area and found it was originating from a metal box with a white plastic end labeled "amp." this box is mounted to the floor between the gas pedal and the passenger side floor, and has a great many wires going into and coming out of it. anyone know what this module is? i found the car to be driveable with no apparent malfunction except for this incessant rythmic clicking. what could be causing this? any ideas are greatly appreciated! thanks!!