Radiator Fan Circuit Troubleshooting

Radiator Fan Circuit Troubleshooting
1. Check the No. 57 (30 A) fuse in the under-hood fuse/relay box.
Is the fuse OK?
YES - Go to step 2.
NO - Replace the fuse and recheck.
2. Remove the radiator fan relay from the under-hood fuse/relay box, and test it.
Is the relay OK ?
YES - Go to step 3.
NO - Replace the radiator fan relay.





3. Measure the voltage between radiator fan relay 4P socket terminal No. 2 and body ground.
Is there battery voltage?
YES - Go to step 4.
NO - Replace the under-hood fuse/relay box.





4. Connect a jumper wire between the radiator fan relay 4P socket terminal No. 1 and No. 2.
Do the radiator fan and condenser fan run?
YES - Go to step 8.
NO - Go to step 5.
5. Disconnect the jumper wire.
6. Disconnect the radiator fan motor 2P connector.





7. Check for continuity between the radiator fan relay 4P socket terminal No. 1 and radiator fan motor 2P connector No. 2.
Is there continuity?
YES - Test the radiator fan motor. If the radiator fan motor is OK, check for an open in the wire between the radiator fan motor connector and body ground.
NO - Check for an open in the wire between the radiator fan motor connector and under-hood fuse/relay box..
8. Disconnect the jumper wire.
9. Disconnect the radiator fan switch B 2P connector.
10. Turn the ignition switch ON (II).





11. Check for continuity between the radiator fan relay 4P socket terminal No. 4 and radiator fan switch B 2P connector terminal No. 1.
Is there continuity?
YES - Go to step 12.
NO - Check for an open in the wire between the radiator fan switch B connector and under-hood fuse/relay box..





12. Check for continuity between the radiator fan switch B 2P connector terminal No. 2 and body ground.
Is there continuity?
YES - Replace radiator fan switch B.
NO - Check for open in the wire between the radiator fan switch B connector and body ground. If the wire is OK, check for poor ground at G101.