2001 sonoma Zr2 4X4

Hi i got a 2001 sonoma Zr2. Today i noticed the light indicator for 2wd was not light up so tried to use 4X4 and didnt work. I checked all the fuses and there all good. Would the switch be burnt out. Nothing at all happens when i push the button for 4X4

I'll bet $500 you didn't like what you discovered.