The 4WD light is a warning light. If your vehicle is not functioning properly the warning light will either remain lit or blink.wojowojo16 said:When I put the truck in 4wd the little car on the dash shows all 4 wheels lit up but the 4x4 to the right does not light up. the 4 Low lights up when in 4 low but never the 4x4. When I start the truck and all the lights come on, the 4x4 does light up. Any thoughts???