Radiator Fan Circuit Troubleshooting

1.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 2.


NO - Replace the fuse (s) and recheck.n


2.Remove the radiator fan relay from the under-hood fuse/relay box, and test it.

Is the relay OK?


YES - Go to 3.


NO - Replace the  radiator fan relay.n


3.Measure the voltage between the No. 2 terminal of the radiator fan relay 4P socket and body ground.

 


Is there battery voltage?


YES - Go to 4.


NO - Replace the under-hood fuse/relay box.n

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 5.


NO - Go to 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 9.


NO - Check for an open in the wire between the under-hood fuse/relay box and under-dash fuse/relay box.n

6.Disconnect the radiator fan motor 2P connector.

7.Check for continuity between the No. 1 terminal of the radiator fan relay 4P socket and the No. 2 terminal of the radiator fan motor 2P connector.

 

Is there continuity?


YES - Go to 8.


NO - Repair open in the wire between the under-hood fuse/relay box and the radiator fan motor 2P connector terminal No. 2.n


8.Check for continuity between the No. 1 terminal of the radiator fan motor 2P connector and body ground.

 

Is there continuity?


YES - Replace the radiator fan motor.n


NO - Check for an open in the wire between radiator fan motor 2P connector terminal No. 1 and body ground. If the wire is OK, check for a poor ground at G201.n

9.Reinstall the radiator fan relay.

10.Disconnect the radiator fan switch 2P connector.

11.Connect the No. 1 and No. 2 terminals, of the radiater fan switch 2P connector with a jumper wire.

 

Does the radiator fan run?


YES - Replace the  radiator fan switch.n


NO - Go to 12.


12.Remove the jumper wire, and measure the voltage between the No. 2 terminal of the radiator fan switch connector and body ground.

 

Is there battery voltage?


YES - Check for an open in the wire between radiator fan switch 2P connector terminal No. 1 and body ground. If the wire is OK, check for a poor ground at  G201.n


NO - Repair open in the wire between the radiator fan switch terminal No. 2 and the under-hood fuse/relay box.n