Your ice maker is electronically controlled.
Check the switch on the inside wall of the freezer to make sure that someone didn't accidentally shut the ice maker off.
To check the emitter and receiver open the freezer door and activate the door switch 3 times, and close the door for 2 seconds.
Open the freezer door and view the LED output code.
The light should pulse twice and then pause and then pulse twice.
Check the continuity of the fill valve at the back of the fridge.
To check the ice maker and optics receiver unplug the fridge then plug it back in.
You have 60 second to open the freezer door and view the LED output code.
For the ice maker you will have 3 pulses then a pause and then 3 pulses.
For the optics receiver you will have 4 pulses then a pause and then 4 pulses.
The emitter and receiver will be check again in this test with 2 pulses then a pause then 2 pulses.
If the system is good the light will be on for 5 seconds.
When you know what you need you can get appliance parts here.