Small box under or around steering column. may have to remove panel under steering column or get lucky and may find it if you lay on your back on floor of driver area. look up underneath for a box 2" x 2" x 1" black box with an l.e.d. light on it. arm the vehicle and bang on steering wheel and look for the led light to light up and set off alarm. light will be red or green and will only light up during vibration.
find adjustment screw on it and turn counterclockwise.