It may have, this function was not working when I tried the fog lights, Could you enlighten me, When in reverse is there only one light on that is the clear light, or is the red fog light on also?? When the fog lights are on only the rear red light is on in conjunction with the normal tail lights. If this were the case only the clear rear light on when in reverse, then the problem is actually with the fog light not the reverse light?? thanks for the input saltiga