Centre diff lock not engaging

[Adzi81]

Hey guys, I have a 2004 Sahara 1hdfte and when I press the centre diff lock button nothing happens but an electrical noise coming from the passenger side, I've tried pressing it in both stationary and moving about 10km an hour and still nothing, no 4x4 light comes on in the dash and no "vsc off" light comes on either , also when I put it in low it doesn't engage either. I am an amatuer at this so please help

 

[Stoddart2000]

Hello I had a similar issue when I first purchased mine and found a blown 20A fuse in the drivers footwell.
Once replaced all was good.
I traced the trip to a corroded rear lock actuator that I unplugged till I could replace.
When I was looking into this fault I seen a lot of people mentioning the 3 sensors on the Centre unit.