[klinn]

ok, thanks for the info. After looking at the schematic, there might be an easy way to diagnose this. I just don't know how the system will act when I tell you what to try. There are 2 connectors to the encoder motor. The encoder motor is an assembly that is bolted to the transfer case. Usually you have to remove the front drive shaft to replace, but the connectors should be easy to find. Before you start, look very closely at all the wiring harnesses around the transfer case, I have seen several that came into contact with the front drive shaft, or other moving parts, also if it is near the exhaust, check to make sure it isn't melted onto it. If you don't find any of those, try this. The connectors are both black in color. One has 4 wires (colored: black, red, orange, & tan), this is connector C1. The other has 6 wires, this is connector C2. Disconnect C1, replace the fuse and try pushing the button again, hopefully the system will still allow the button system to work. If the fuse doesn't blow, try plugging in C1, and see if the fuse blows. If it does, you will need an encoder motor. If the fuse doesn't blow, the only other component that is powered by that fuse is the transfer case shift control module. Now it has been my experience in the past, when a GM vehicle blows a fuse, it has 99.999% of the time been the motor or actuator or high electrical current draw component on that circuit. In your case it would be the encoder motor. Let me know how this turns out, there is more that could be done, but I don't feel like writing the book all at one time, just each chapter as needed.