Radiator and A/C Condenser Fan Low Speed Circuit Troubleshooting

NOTE:


1.Check the No. 10 (30 A) fuse in the under-hood fuse/relay box, and the No. 14 (10 A) fuse in the under-dash fuse/relay box.

Are the fuses OK?


YES - Go to 2.


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


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

Is the relay OK?


YES - Go to 3.


NO - Replace the  A/C condenser fan relay.n


3.Measure the voltage between the No. 1 terminal of the A/C condenser 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 A/C condenser fan relay 4P socket with a jumper wire.

 

Does the A/C condenser fan run?


YES - Go to 5.


NO - Go to 12.


5.Disconnect the jumper wire.

6.Turn the ignition switch ON (II).

7.Measure the voltage between the No. 4 terminal of the A/C condenser fan relay 4P socket and body ground.

 

Is there battery voltage?


YES - Go to 8.


NO - Repair open in the BLK/YEL wire between the No. 14 fuse in the under-dash fuse/relay box and the A/C condenser fan relay.n

8.Turn the ignition switch OFF.

9.Disconnect the heater control panel 36P connector.

10.Turn the ignition switch ON (II).

11.Measure the voltage between the No. 31 terminal of the heater control panel 36P connector and body ground.

 

Is there battery voltage?


YES - Check for loose wires or poor connections at the heater control panel 36P connector, and A/C condenser fan relay. If the connections are good, substitute a known-good heater control panel, and recheck. If the symptom/indication goes away, replace the original heater control panel.n


NO - Repair open in the wire between A/C condenser fan relay and the heater control panel.n


12.Disconnect the jumper wire.

13.Reinstall the A/C condenser fan relay.

14.Disconnect the A/C condenser fan 2P connector.

15.Turn the ignition switch ON (II), then turn the A/C and fan switches ON.

16.Measure the voltage between the No. 2 terminal of the A/C condenser fan 2P connector and body ground.

 


Is there battery voltage?


YES - Go to 17.


NO - Repair open in the wire between the A/C condenser fan relay and the A/C condenser fan.n


17.Turn the A/C and fan switches OFF, then turn the ignition switch OFF.

18.Reconnect the A/C condenser fan 2P connector.

19.Connect the No. 1 terminal of the A/C condenser fan 2P connector to body ground with jumper wire.

 

20.Turn the ignition switch ON (II), then turn the A/C and fan switches ON.

Does the A/C condenser fan run?


YES - Go to 21.


NO - Replace the A/C condenser fan motor.n


21.Turn the A/C and fan switches OFF, then turn the ignition switch OFF.

22.Disconnect the jumper wire.

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

Is the relay OK?


YES - Go to 24.


NO - Replace the fan control relay.n


24.Turn the ignition switch ON (II), then turn the A/C and fan switches ON.

25.Measure the voltage between the No. 1 terminal of the fan control relay 5P socket and body ground.

 

Is there battery voltage?


YES - Go to 26.


NO - Repair open in the wire between the A/C condenser fan and the fan control relay.n


26.Turn the A/C and fan switches OFF, then turn the ignition switch OFF.

27.Disconnect the radiator fan 2P connector.

28.Check for continuity between the No. 4 terminal of the fan control relay 5P socket and the No. 2 terminal of the radiator fan 2P connector.

 

Is there continuity?


YES - Go to 29.


NO - Repair open in the wire between the fan control relay and the radiator fan.n


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

 

Is there continuity?


YES - Replace the radiator fan motor.n


NO - Check for an open in the wire between the radiator fan and body ground. If the wire is OK, check for poor ground at G201.n