...ideas? I have checked the cruise switch on the multifunction lever, replaced the brake switch, brake lights work, third brake light works, checked the ground on the abs module, I can't find the problem, any ideas??
Did you just replace all your lights with LEDs. Changing ALL exterior light to LED will cause the cruise to fail. It senses not enough resistance in the lighting circuitry and will not allow cruise to work due to "lighting safety". I changed all my lights to LED and it worked fine until I later changed the high brake light on the cab to LED. Bingo, the cruise failed. There is a work around by putting a resistor in line that will fool the computer and the cruise will work again, but I just changed the 3rd brake light back to incandescent and my cruise worked again. Without a resistor or any incandescent bulb in the brake circuitry the computer senses that the brakes are ON all the time and will not allow the cruise to engage.
