Radiator and A/C Condenser Fan Circuit Troubleshooting
Check the No. 10 (7.5 A) fuse in the under-dash fuse/relay box.
Is the fuse OK?
YES
-
Go to
Step 2
.
NO
-
Replace the fuse and recheck.■
Remove the radiator fan relay.
Turn the ignition switch to ON (II).
Measure the voltage between the radiator fan relay 4P socket terminal No. 4 and body ground.
Is there battery voltage?
YES
-
Go to
Step 5
.
NO
-
Repair open in the wire between the under-dash fuse/relay box and the radiator fan relay 4P socket terminal No. 4.■
Turn the ignition switch to LOCK (0).
Connect the Honda Diagnostic System (HDS) to the data link connector (DLC).
Turn the ignition switch to ON (II).
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.
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.
Disconnect ECM/PCM connector A (49P).
Check for continuity between the radiator fan relay 4P socket terminal No. 3 and ECM/PCM connector terminal A6.
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 radiator fan relay 4P socket terminal No. 3 and ECM/PCM connector terminal A6.■
