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sounds like a fan relay

check the relays for RAD FAN 1, RAD FAN 2, RAD FAN 3.

I would say to do this. Let the car run. When it starts showing its hot, turn the car off, switch the relays for the fans from one to the other and immediately start the car. If this is correct your fans should come right on. You could also goto advance, buy an extra relay and try it, but I think the switching between relays should be enough test.

btw both fans are 4 wires, 2 speed. each speed has its own ground and 12v. the 12v is switched by a relay. the relay is activated by a 'ground' pulse from the ECU.
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