There is normally a wiring diagram on the unit somewhere. on the back or behind one of the covers.
either way there is not much to it if is just a fridge. if there is no electric defrost then the only thing that will usually turn them off it the door switch - when you open the door the fan can go off and the light on- if it is more of a commercial type fridge then there is possibly a coil temp sensor (clixon) a little switch that reacts to the temp of the evaporator coil and will not let the fan come on until the coil reached a pre set temp.
if there is electric defrost (usually only on freezers but sometimes on fridges) then there will be a defrost timer. if this is the case then the compressor will turn off while the fan is off and heaters will warm up the coil.
if you just want to check the fan then grab a multimeter and do a basic continuity test between the 2 wires (not the earth wire) if you have a reading then most likely the fan is ok
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