The feed solinoid to the ice maker has gone out. To test this you need to unplug the unit and wait a few minuits. Plug it back in and listen carefully for the solinoid to click. If the water dispensor (if so equiped) is working you can have someone activate it and the solinoid for it will click. this will tell you what to listen for. To locate the solinoid just follow the water line from the wall to the unit.
Ok if the water dispensor is working properly see if you can switch the wires on the solinoid. If the water dispensor begins to operate (have someone there ready to catch the water ) then the solinoid is bad. If the wires can npt be switched then you will need a volt ohm meter to test the wires for power. If the wires do not have power then a service tech will be required. due to the complexity and location of the wiring harness i personally will not attempt the repair myself. this repair is quite involved and is best left to a qualified tech.