( TL19E30A14426149411FAAT00 )

Radiator Fan Circuit Troubleshooting

1. Check the No. 3−6 (30 A) fuse in the under-hood fuse/relay box and the No. 16 (7.5 A) fuse in the driver's under-dash fuse/relay box.

Are the fuses OK?

YES | - | Go to Step 2 .
NO | - | Replace the fuse(s) and recheck.■

1. Remove the radiator fan relay and the relay circuit board from the under-hood fuse/relay box, and test the radiator fan relay and fan control relay.

Is the relays OK?

YES | - | Go to Step 3 .
NO | - | Replace the radiator fan relay and/or relay circuit board and recheck.■

1. Test the radiator fan motor.

Is the motor OK?

YES | - | Go to Step 4 .
NO | - | Replace the radiator fan motor. ■

1. Measure the voltage between the radiator fan relay 4P socket terminal No. 1 and body ground.

Is there battery voltage?

YES | - | Go to Step 5 .
NO | - | Replace the under-hood fuse/relay box.■

1. Turn the ignition switch to ON (II).

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

Is there battery voltage?

YES | - | Go to Step 7 .
NO | - | Replace the under-hood fuse/relay box.■

1. Turn the ignition switch to LOCK (0).

1. Disconnect the radiator fan motor 2P connector.

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

Is there continuity?

YES | - | Go to Step 10 .
NO | - | Repair open in the wire between the under-hood fuse/relay box and the radiator fan motor 2P connector terminal No. 2.■

1. Connect the Honda Diagnostic System (HDS) to the data link connector (DLC).

1. Turn the ignition switch to ON (II).

1. Make sure the HDS communicates with the vehicle and the engine control module (ECM)/powertrain control module (PCM). If it doesn't communicate, troubleshoot the DLC circuit.

1. Jump the SCS line with the HDS, then turn the ignition switch to LOCK (0).
   NOTE: This step must be done to protect the ECM/PCM from damage.

1. Disconnect ECM/PCM connector A (49P)

1. Check for continuity between the radiator fan relay 4P socket terminal No. 3 and ECM/PCM connector terminal A5.

Is there continuity?

YES | - | Go to Step 16 .
NO | - | Repair open in the wire between the under-hood fuse/relay box and ECM/PCM connector terminal A5.■

1. Disconnect the under-hood fuse/relay box connector B.

1. Check for continuity between the radiator fan motor 2P connector terminal No. 1 and under-hood fuse/relay box connector B11.

Is there continuity?

YES | - | Go to Step 18 .
NO | - | Repair open in the wire between the under-hood fuse/relay box and the radiator fan motor 2P connector terminal No. 1.■

1. Check for continuity between under-hood fuse/relay box connector D10 and ECM/PCM connector terminal A6.

Is there continuity?

YES | - | Go to Step 19 .
NO | - | Repair open in the wire between the under-hood fuse/relay box and ECM/PCM connector terminal A6.■

1. Check for continuity between under-hood fuse/relay box connector B1 and body ground.

Is there continuity?

YES | - | Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom goes away with a known-good ECM/PCM, replace the original ECM/PCM. ■
NO | - | Repair open in the wire between the under-hood fuse/relay box and body ground. If the wire is OK, check for a poor ground at G301.■