I have an 05 Envoy SWB, 220,000 miles 4.2 4WD. Horn stopped working and when I hit the horn pad the right blinker lights up steady on the dash and front light. Additionally, when I put the right blinker on by itself, it blinks VERY fast. I discovered all this happens when the lights are on auto or manually. With the lights off everything is back to normal. Everything else seems to be ok except that I can only see my odometer and transmission displays when its dark out but that has that way for a long time - I don't think its related but thought I'd mention it. Before I go pulling fuses and what not, I thought I'd run run this by you all. It's stock with no mods.