on the little screen inside my 93 GC laredo, it says 'REAR LAMP FAILURE'. now i just got dun changin out all the bulbs in both tail lights: brake,back-up, blinkers and side markers and they all work, but i still get that signal some1 help please

 

make sure you put exactly the right bulbs in. I had the same problem on mine. the 3rd brake light is like a 921 bulb and all I had were 912s, they look the exact same size wise and they lit up, but the resistance or voltage is different and will trigger the warning light. hope this helps