Radiator Fan Circuit Troubleshooting
Radiator Fan Circuit Troubleshooting2004-2005 Models
NOTE: Before beginning this troubleshooting procedure, refer to the symptom troubleshooting index. Symptom Related Diagnostic Procedures
1. Check the No. 11 (20 A) fuse in the under-hood fuse/relay box, and the No. 30 (7.5 A) fuse in the under-dash fuse/relay box.
Are the fuses OK?
YES - Go to step 2.
NO - Replace the fuse(s) 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 radiator fan relay 4P socket terminal No. 1 and No. 2 with a jumper wire.
Does the radiator fan run?
YES - Go to step 5.
NO - Go to step 6.
5. Disconnect the jumper, and turn the ignition switch ON (II). Check for voltage between radiator fan relay 4P socket terminal No. 3 and body ground.
Is there battery voltage?
YES - Go to step 9.
NO - Repair an open in the wire between the under-hood fuse/relay box and under-dash fuse/relay box.
6. Disconnect the radiator fan motor 2P connector.
7. Check for continuity between radiator fan relay 4P socket terminal No. 1 and radiator fan motor 2P connector terminal No. 2.
Is there continuity?
YES - Go to step 8.
NO - Repair an open in the wire between the under-hood fuse/relay box and radiator fan motor 2P connector terminal No. 2.
8. Check for continuity between radiator fan motor 2P connector terminal No. 1 and body ground.
Is there continuity?
YES - Replace the radiator fan motor.
NO - Repair 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 G301.
9. Reinstall the radiator fan relay.
10. Disconnect the radiator fan switch 2P connector.
11. Connect radiator fan switch 2P connector terminal No. 1 and No. 2 with a jumper wire.
Does the radiator fan run?
YES - Replace the radiator fan switch.
NO - Go to step 12.
12. Remove the jumper Wire, and measure the voltage between radiator fan switch 2P connector terminal No. 2 and body ground.
Is there battery voltage?
YES - Repair 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 G301.
NO - Repair an open in the wire between radiator fan switch 2P connector terminal No. 2 and the under-hood fuse/relay box.
2006 Model
NOTE: Before beginning this troubleshooting procedure, refer to the symptom troubleshooting index. Symptom Related Diagnostic Procedures
1. Check the No. 11 (30 A) fuse in the under-hood fuse/relay box, and the No. 30 (7.5 A) fuse in the under-dash fuse/relay box.
Are the fuses OK?
YES - Go to step 2.
NO - Replace the fuse(s) 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 radiator fan relay 4P socket terminal No. 1 and No. 2 with a jumper wire.
Does the radiator fan run?
YES - Go to step 5.
NO - Go to step 6.
5. Disconnect the jumper, and turn the ignition switch ON (II). Check for voltage between radiator fan relay 4P socket terminal No. 3 and body ground.
Is there battery voltage?
YES - Go to step 9.
NO - Repair an open in the wire between the under-hood fuse/relay box and under-dash fuse/relay box.
6. Disconnect the radiator fan motor 2P connector.
7. Check for continuity between radiator fan relay 4P socket terminal No. 1 and radiator fan motor 2P connector terminal No. 2.
Is there continuity?
YES - Go to step 8.
NO - Repair an open in the wire between the under-hood fuse/relay box and radiator fan motor 2P connector terminal No. 2.
8. Check for continuity between radiator fan motor 2P connector terminal No. 1 and body ground.
Is there continuity?
YES - Replace the radiator fan motor.
NO - Repair 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 G301.
9. Connect the Honda Diagnostic System (HDS) to the data link connector (DLC). Turn the ignition switch ON (II), and jump the SCS line with the HDS, then turn the ignition switch OFF.
NOTE: This step must be done to protect the engine control module (ECM)/powertrain control module (PCM) from damage.
10. Disconnect ECM/PCM connector E (31P).
11. Check for continuity between ECM/PCM connector terminal E12 and body ground.
Is there continuity?
YES - Repair a short in the wire between the underhood fuse/relay box and the ECM/PCM.
NO - Repair an open in the wire between the under-hood fuse/relay box and the ECM/PCM.