Fig. 123: Identifying Passenger's Dashboard Undercover, Clips, Pins And Holder
Courtesy of AMERICAN HONDA MOTOR CO., INC.
RADIATOR AND A/C CONDENSER FAN LOW SPEED CIRCUIT
TROUBLESHOOTING (CLIMATE CONTROL)
Fig. 124: Radiator And A/C Condenser Fan Low Speed Circuit Troubleshooting Flow Chart (1 Of 2)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Fig. 125: Radiator And A/C Condenser Fan Low Speed Circuit Troubleshooting Flow Chart (2 Of 2)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
NOTE:
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Do not use this troubleshooting procedure if the A/C compressor is
inoperative. Refer to the symptom troubleshooting index.
If A/C refrigerant pressure is abnormal, the radiator and condenser fans
are controlled based only on engine coolant temperature.
Before doing symptom troubleshooting, check for PGM-FI DTCs See HOW
TO TROUBLESHOOT THE A/T SYSTEM or HOW TO TROUBLESHOOT THE
FUEL AND EMISSIONS SYSTEMS .
1. Fuse check:
1. Check the following fuse.
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Fuse No. A2-11 (20 A)
Location Under-hood fuse/relay box
Is the fuse OK?
YES : Go to step 2.
NO : Replace the fuse, and recheck. If the fuse blows again, check for a short in the No. A2-11 (20 A)
fuse circuit.
2. Radiator fan relay check:
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1. 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. A/C signal output check:
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1. Connect the HDS to the DLC.
2. Turn the ignition switch to ON (II). Make sure the A/C system is OFF, then start the engine.
3. Press the fan control button ON, then momentarily turn ON the A/C with the A/C button.
NOTE:
Do not run the A/C for more than a few seconds with the engine
running or damage to the A/C system will result.
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4. Check the parameter(s) below with the HDS.
Threshold Current conditions
Signal
Values Unit Values
Unit
FAN LOW CTRL ON
Is the FAN LOW CTRL on with the A/C on?
YES : Go to step 4.
NO : Update the PCM See PCM REMOVAL AND INSTALLATION or PCM UPDATE if it does
not have the latest software, or substitute a known-good PCM See PCM REMOVAL AND
INSTALLATION or PCM UPDATE , and recheck.
4. Open wire check (+B MAIN FAN line):
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1. Turn the ignition switch to LOCK (0).
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2. Measure the voltage between test points 1 and 2.
Test condition IG LOCK (0)
Radiator fan relay: disconnected
Test circuit +B MAIN FAN
Test point 1 Radiator fan relay 4P socket No. 1 (PUR) (Built into the under-hood fuse/relay box)
Test point 2 Body ground
Fig. 126: Measuring Voltage Between Test Points 1 And 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there battery voltage?
YES : The +B MAIN FAN wire is OK. Go to step 5.
NO : An open in the +B MAIN FAN wire. REPLACE THE UNDER-HOOD FUSE/RELAY BOX .
5. Determine possible failure area (radiator fan relay switch side circuit, radiator fan relay coil side circuit):
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1. Connect terminals A and B with a jumper wire.
Terminal A Radiator fan relay 4P socket No. 1 (PUR) (Built into the under-hood fuse/relay box)
Terminal B Radiator fan relay 4P socket No. 2 (PNK) (Built into the under-hood fuse/relay box)
Fig. 127: Connecting Terminals A And B With Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Do the A/C condenser and radiator fans run on low?
YES : Go to step 6.
NO : Go to step 8.
6. Radiator fan relay coil side power circuit check:
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1. Disconnect the jumper wire.
2. Turn the ignition switch to ON (II).
3. Measure the voltage between test points 1 and 2.
Test condition IG ON (II)
Radiator fan relay: disconnected
Test circuit MAIN FAN DIODE-
Test point 1 Radiator fan relay 4P socket No. 8 (LT BLU) (Built into the under-hood fuse/relay
box)
Test point 2 Body ground
Fig. 128: Measuring Voltage Between Test Points 1 And 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there battery voltage?
YES : Go to step 7.
NO : Go to step 13.
7. Open wire check (FAN LO SIGNAL line):
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1. Turn the ignition switch to LOCK (0).
2. Reinstall the radiator fan relay.
3. Jump the SCS line with the HDS.
NOTE:
This step must be done to protect the PCM from damage.
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4. Disconnect the following connector.
PCM connector A (49P)
5. Connect terminals A and B with a jumper wire.
Terminal A PCM connector A (49P) No. 15 (PUR)
Terminal B Body ground
Fig. 129: Connecting Terminals A And B With Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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6. Turn the ignition switch to ON (II).
Do the A/C condenser and radiator fans run on low?
YES : Update the PCM See PCM REMOVAL AND INSTALLATION or PCM UPDATE if it does
not have the latest software, or substitute a known-good PCM See PCM REMOVAL AND
INSTALLATION or PCM UPDATE , and recheck.
NO : Repair an open in the wire between the radiator fan relay and the PCM.
8. Open wire check (MAIN FAN MOTOR line):
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1. Disconnect the jumper wire.
2. Reinstall the radiator fan relay.
3. Disconnect the following connector.
Radiator fan motor 2P connector
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4. Turn the ignition switch to ON (II). Make sure the A/C system is OFF, then start the engine.
5. Press the fan control button ON, then momentarily turn ON the A/C with the A/C button.
NOTE:
Do not run the A/C for more than a few seconds with the engine
running or damage to the A/C system will result.
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6. Measure the voltage between test points 1 and 2.
Test condition IG ON (II)
Radiator fan motor 2P connector: disconnected
Test circuit MAIN FAN MOTOR
Test point 1 Radiator fan motor 2P connector No. 1 (PNK)
Test point 2 Body ground
Fig. 130: Measuring Voltage Between Test Points 1 And 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there battery voltage with the A/C on?
YES : The MAIN FAN MOTOR wire is OK. Go to step 9.
NO : Repair an open in the wire between the radiator fan relay and the radiator fan motor.
9. Radiator and A/C condenser fan motors test:
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1. Turn the ignition switch to LOCK (0).
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2. TEST THE RADIATOR AND THE A/C CONDENSER FAN MOTORS .
Are the radiator and A/C condenser fan motors OK?
YES : Go to step 10.
NO : Replace the RADIATOR FAN MOTOR and/or the A/C CONDENSER FAN MOTOR .
10. Fan control relay check:
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1. Remove the fan control relay from the under-hood fuse/relay box, and TEST IT .
Is the relay OK?
YES : Go to step 11.
NO : Replace the fan control relay.
11. Open wire check (FAN HI/LO RLY COM line):
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1. Reconnect the radiator fan motor 2P connector.
2. Turn the ignition switch to ON (II). Make sure the A/C system is OFF, then start the engine.
3. Turn the fan control button ON, then momentarily turn ON the A/C with the A/C button.
NOTE:
Do not run the A/C for more than a few seconds with the engine
running or damage to the A/C system will result.
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4. Measure the voltage between test points 1 and 2.
Test condition IG ON (II)
Fan control relay: disconnected
Test circuit FAN HI/LO RLY COM
Test point 1 Fan control relay 5P socket No. 4 (LT GRN) (Built into the under-hood fuse/relay box)
Test point 2 Body ground
Fig. 131: Measuring Voltage Between Test Points 1 And 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there battery voltage with the A/C on?
YES : The FAN HI/LO RLY COM wire is OK. Go to step 12.
NO : Repair an open in the wire between the radiator fan motor and the fan control relay.
12. Open wire check (SUB FAN MOTOR line):
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1. Then turn the ignition switch to LOCK (0).
2. Disconnect the following connector.
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A/C condenser fan motor 2P connector
3. Check for continuity between test points 1 and 2.
Test condition IG LOCK (0)
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Fan control relay: disconnected
A/C condenser fan motor 2P connector: disconnected
Test circuit SUB FAN MOTOR
Test point 1 Fan control relay 5P socket No. 6 (YEL) (Built into the under-hood fuse/relay box)
Test point 2 A/C condenser fan motor 2P connector No. 1 (YEL)
Fig. 132: Checking For Continuity Between Test Points 1 And 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES : Check for an open in the wire between the A/C condenser fan motor and body ground. If the wire
is OK, check for poor ground at G302.
NO : Repair an open in the wire between the fan control relay and the A/C condenser fan motor.
13. A/C diode B check:
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1. Turn the ignition switch to LOCK (0).
2. Remove A/C diode B from the under-hood fuse/relay box.
3. 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. 133: Identifying A/C Diode B
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there current flow in only one direction?
YES : Go to step 14.
NO : Replace the A/C diode B.
14. Open wire check (IG2 A/C line):
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1. Turn the ignition switch to ON (II).
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2. Measure the voltage between test points 1 and 2.
Test condition IG ON (II)
Radiator fan relay: disconnected
A/C diode B: disconnected
Test circuit IG2 A/C
Test point 1 A/C diode B 2P socket No. 2 (PNK)
Test point 2 Body ground
Fig. 134: Measuring Voltage Between Test Points 1 And 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there battery voltage?
YES : The IG2 A/C wire is OK. REPLACE THE UNDER-HOOD FUSE/RELAY BOX .
NO : Repair an open in the wire between the No. B22 (7.5 A) fuse in the under-dash fuse/relay box and
the A/C diode B.
RADIATOR AND A/C CONDENSER FAN LOW SPEED CIRCUIT
TROUBLESHOOTING (MANUAL A/C)
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