A/C Condenser Fan High Speed Circuit Troubleshooting

NOTE:

Do not use this troubleshooting procedure if the A/C compressor is inoperative. Refer to the SYMPTOM TROUBLESHOOTING INDEX .
Before doing symptom troubleshooting, check for powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).

Check the No. 6 (30 A) fuse and the No. 15 (7.5 A) fuse in the under-hood fuse/relay box.
Are the fuses OK?

YES -Go to step 2.

NO -Replace the fuse(s), and recheck. If the fuse(s) blow again, check for a short in the No. 6 (30 A) and the No. 15 (7.5 A) fuse(s) circuit.
Remove the A/C condenser fan relay from the under-hood fuse/relay box, and test it (see POWER RELAY TEST ).
Is the relay OK?

YES -Go to step 3.

NO -Replace the A/C condenser fan relay.
Measure the voltage between A/C condenser fan relay 4P socket terminal No. 1 and body ground.

Fig 1: Measuring Voltage Between A/C Condenser Fan Relay 4P Socket Terminal No. 1 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Go to step 4.

NO -Replace the under-hood fuse/relay box (see REMOVAL AND INSTALLATION ).
Connect A/C condenser fan relay 4P socket terminals No. 1 and No. 2 with a jumper wire.

Fig 2: Identifying Connection Between A/C Condenser Fan Relay 4P Socket Terminals No. 1 And 2 Using Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Does the A/C condenser fan run on high?

YES -Go to step 5.

NO -Replace the under-hood fuse/relay box (see REMOVAL AND INSTALLATION ).
Disconnect the jumper wire.
Turn the ignition switch to ON (II).
Measure the voltage between A/C condenser fan relay 4P socket terminal No. 4 and body ground.

Fig 3: Measuring Voltage Between A/C Condenser Fan Relay 4P Socket Terminal No. 4 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Go to step 8.

NO -Go to step 14.
Turn the ignition switch to LOCK (0).
Reinstall the A/C condenser fan relay.
Jump the SCS line with the HDS.
NOTE: This step must be done to protect the powertrain control module (PCM) from damage.
Disconnect PCM connector A (49P).
Connect PCM connector A (49P) terminals No. 4, No. 5 and No. 40 to body ground with a jumper wire.

Fig 4: Identifying PCM Connector A (49P) Terminals No. 4, No. 5 And No. 40 Connection Between Body Ground Using Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch to ON (II).
Does the A/C condenser fan run on high?

YES -Check for loose wires or poor connections at PCM connector A (49P) terminals No. 5 and No. 40. If the connections are good, substitute a known-good PCM (see SUBSTITUTING THE PCM ), and recheck. If the symptom/indication goes away, replace the original PCM (see PCM REPLACEMENT ).

NO -Repair an open in the wire between the A/C condenser fan relay and the PCM.
Remove A/C diode B from the under-hood fuse/relay box.
Turn the ignition switch to ON (II).
Measure the voltage between A/C diode B 2P socket terminal No. 2 and body ground.

Fig 5: Measuring Voltage Between A/C Diode B 2P Socket Terminal No. 2 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Go to step 17.

NO -Replace the under-hood fuse/relay box (see REMOVAL AND INSTALLATION ).
Using the diode setting on a DVOM, check for current flow in both directions between A/C diode B terminals No. 1 and No. 2.

Fig 6: Checking Current Flow In Directions Between A/C Diode B Terminals No. 1 And No. 2 Using Diode Setting On DVOM
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there current flow in only one direction?

YES -Replace the under-hood fuse/relay box (see REMOVAL AND INSTALLATION ).

NO -Replace A/C diode B.