electric 4 X 4

My 1990 Bronco II will not engage into 4 wheel drive or low range. The dash lights started coming on and off and then just went out and nothing happens when I push the dash buttons now. I've tested the shifting motor on the transfer case and it works. I am suspecting the electronic control module but am not convinced there is not a power or ground problem to the module. Where would a fuse be for this unit and where can I get electrical drawings for this that I can use for troubleshooting? Are there any short cut alternatives to this control module?

The module is usually mounted in the left quarter or in the middle of the dash . It has a test out button on it. It is made by United Technoligys and is normally pretty strong. The motor is almost always the problem.

check the usebox it shares with another option.check complete wires eo and from motor..

on my 1990 bronco the reset button was on the passenger kick panel with a small button on it i pressed it and reset the 4x4