Sonata GL V6-2.5L (1999)
ECM Control logic
Radiator Fan Motor Relay
1. Remove the radiator fan motor relay (HI and LO) from the relay box in engine room.
2. Check the continuity the terminals "86" and "85" with an ohmmeter.
3. Apply DC12 V to the terminals "86" and ground the terminal 85".
4. Check for continuity between the terminals "87" and "30".