Hey i got a 1999 2 door blazer and 4wd doesent work. i have the 3 button switch but no lights come on when i start the car or at anytime. when i push the 4 hi or 4 lo nothin happens no blinking lights. im thinking its a fuse or the tccm. anybody know where the fuse/tccm is?

 

I think the fuses for the TCM are under the hood on your year Blazer. And for further diagnosis, I suggest you check out the Tech Article Index. There's tons of great diagnosis walk throughs posted in there.