No.. that is just the load/feed side of the fan circuit..if the resistor opens , the fan can not run [ low fan] as it can not get any power feed..so an open resistor results in NO fan..
The default circuit would be when a sensor opens on the high fan circuit.
The controler [ N22] then goes into default so there is no chance of engine overheat due to bad sensor .
The sensor for this would be the 2 prong blue one on the engine ... this is high fan .. check it with an ohm meter and see what you have .. the default will also appear if the connector to this thermistor/sensor is loose/poor connection..
A stuck relay could also cause this, but I doubt it cuz you said you can hear the relay contacts open/close..

We actually unplug the blue sensor as a test to see if the aux fan circuits relay and wiring/fuses are good. By putting the controller into default by removing this connector, the high fan should come on....same as if the sensor was bad or not connected ...