S2000 L4-2.2L (2004)
4. Connect the No. 1 and No. 2 terminals of the radiator fan relay 4P socket with a jumper wire.
Does the radiator fan run?
YES - Go to step 5.
NO - Go to step 6.
5. Disconnect the jumper, and turn the ignition switch ON (II). Check for voltage between the No. 3 terminal of the radiator fan relay 4P socket and
body ground.
Is there battery voltage?
YES - Go to step 9.
NO - Check for an open in the BLK/YEL wire between the main under-hood fuse/relay box and the under-dash fuse/relay box..
6. Disconnect the radiator fan connector.
7. Check for continuity between the No. 2 terminal of the radiator fan relay 4P socket and the No. 2 terminal of the radiator fan connector.
Is there continuity?
YES - Go to step 8.
NO - Repair open in the BLU/BLK wire between the main under-hood fuse/relay box and the radiator fan.