Bought this Blazer, nice shape with 106K miles.
Pushing any of the 4wd buttons does nothing. Don't even light up.
I know, check the fuses. But that's not how my luck runs.
So assuming it's not a fuse, where do I start?
Thanks.

 

If it's not lighting up, it sounds like the unit has power interrupted. Check the wiring harness near the unit,
to be sure it is connected. Then be sure it us grounded. Have you run an OBD scan?

 

The switch on that era was a cuprit

 

I agree the switches tend to be bad and if not trace the power and find out where it's interrupted.

 

the 4WD computer is behind the side panel on the passenger side close to where you put your feet. check the connections, fuses, and if nothing else go to a junk yard get another switch and computer.