little black box

quick question... my 4wd isnt working and i have the transfer case switch cuz i hear that a frequen problem... but when i try to engage 4wd i hear a loud clicking coming from underneath my center console.... theres a little black box underneth there... what is it and could it be my problem?

quick question... my 4wd isnt working and i have the transfer case switch cuz i hear that a frequen problem... but when i try to engage 4wd i hear a loud clicking coming from underneath my center console.... theres a little black box underneth there... what is it and could it be my problem?

We need the year make and model and what transfer case you have.
What type of shift buttons or shifter or transfer case tag no off the back of transfer case.
Any blinking or check engine or transfer case lights on?

94 s10 blazer... 4.3L w motor... no lights on... the electric 4wd switch is on the left side of the st. wheel. the lights click on as if the 4wd was working properly... in lo and hi... just get the clicking near the center console, and only rear wheel grip... or spin... lol

Does the transfer case engage? When you press the button, does it light up the green light in 4hi, or amber light in 4lo, or does it just click a few times, and no lights light up?

evrything lights up like it should! i dont know the colors since im red green color blind, but they dont just flash a bit... the are on steady when i push the buttons