Radiator and A/C Condenser Fan Low Speed Circuit Troubleshooting
NOTE:
- Do not use this troubleshooting procedure if the A/C compressor is inoperative. Refer to the symptom troubleshooting index.
- Before performing symptom troubleshooting, check for powertrain DTCs.
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.
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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 |