Check the No. 4 (20A) fuse in the under-hood fuse/relay box, and the No. 14 (10A) fuse in the under-dash fuse/relay box. Is the fuse (s) OK? YES - Go to step 2. NO - Replace the fuse (s) and recheck. Remove the radiator fan relay from the under-hood fuse/relay box, and test it, refer to the 2001 Civic Shop Manual (see page 22-80). Is the relay OK? YES - Go to step 3. NO - Replace the radiator fan relay. Measure the voltage between the No. 2 terminal of the radiator fan relay 4P socket and body ground. RADIATOR FAN RELAY 4P SOCKET Terminal side of male terminals Is there battery voltage? YES - Go to step 4. NO - Replace the under-hood fuse/relay box.

Connect the No. 1 and No. 2 terminals of the radiator fan relay 4P socket with a jumper wire. RADIATOR FAN RELAY 4P SOCKET Terminal side of male terminals Does the radiator fan run? YES - Go to step 5. NO - Go to step 6. Disconnect the jumper wire, 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. RADIATOR FAN RELAY 4P SOCKET Terminal side of male terminals Is there battery voltage? YES - Go to step 9. NO - Check for an open in the wire between the under-hood fuse/relay box and under-dash fuse/relay box. aaa