The radiator fan relay is located in the relay box in the engine compartment.
Remove the relay from the relay box.
Apply battery voltage to pins 1 and 2 of the relay as shown. Connect an ohmmeter to pins 3 and 4 at the same time. The resistance should be 0 ohm.
Switch off the voltage, the resistance between pins 3 and 4 should be ∞.
Check resistance between pins 1 and 2 - battery voltage should be off. The required value is 0 ohm.