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Table of Contents > A/C Signal Circuit Troubleshooting (Manual A/C)

Honda CR-V Heating, Ventilation & Air Conditioning Troubleshooting ➜ A/C Signal Circuit Troubleshooting (Manual A/C)

NO : REPLACE THE UNDER-DASH FUSE/RELAY BOX .  
10. Evaporator temperature sensor check:  
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1. Turn the ignition switch to LOCK (0).  
2. Disconnect the following connector.  
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Climate control unit 32P connector  
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3. Measure the resistance between test points 1 and 2.  
Test condition IG LOCK (0)  
Climate control unit 32P connector: disconnected  
Test circuit TEVA, SENSOR COM  
Test point 1 Climate control unit 32P connector No. 18 (ORN)  
Test point 2 Climate control unit 32P connector No. 23 (GRY)  
Fig. 41: Measuring Resistance Between Test Points 1 And 2  
Courtesy of AMERICAN HONDA MOTOR CO., INC.  
Is the resistance less than 24 kohms?  
YES : REPLACE THE CLIMATE CONTROL UNIT .  
NO : TEST THE EVAPORATOR TEMPERATURE SENSOR .  
A/C SIGNAL CIRCUIT TROUBLESHOOTING (MANUAL A/C)  
Fig. 42: A/C Signal Circuit Troubleshooting Flow Chart  
Courtesy of AMERICAN HONDA MOTOR CO., INC.  
NOTE:  

Do not use this troubleshooting procedure if any of the following items are  
operative with the A/C button and the fan control dial to ON: The A/C  
condenser fan, the radiator fan, or the A/C compressor. Refer to the  
symptom troubleshooting index.  


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 .  
Do not use this troubleshooting procedure if the A/C system pressure is  
abnormal.  
1. Blower motor operation check:  
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1. Turn the ignition switch to ON (II).  
2. Check if the blower motor operates at all speeds.  
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Does the blower motor operate at all speeds?  
YES : Go to step 2.  
NO : REPAIR THE PROBLEM IN THE BLOWER MOTOR CIRCUIT .  
2. A/C pressure threshold check:  
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1. Turn the ignition switch to LOCK (0).  
2. Connect the HDS to the DLC.  
3. Start the engine.  
4. Set the A/C button and the fan control dial to ON.  
5. Check the parameter(s) below with the HDS.  
Threshold  
Values Unit  
196 - 3, 38 kPa  
A/C PRESSURE 2.00 - 32.00  
Current conditions  
Values Unit  
Signal  
2
kgf/cm  
28.4 - 455.1 psi  
Do the current condition(s) match the threshold?  
YES : Go to step 3.  
NO : Go to the A/C SYSTEM TEST RESULT.  
3. HVAC control system check:  
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1. Check the parameter(s) below with the HDS.  
Threshold Current conditions  
Signal  
Values Unit Values  
Unit  
A/C SWITCH ON  
A/C CLUTCH ON  
Do the current condition(s) match the threshold?  
YES : Go to the A/C COMPRESSOR CLUTCH CIRCUIT TROUBLESHOOTING.  
NO : A/C SWITCH is OFF, go to step 4.  
NO : A/C SWITCH is ON and A/C CLUTCH is OFF, high ETC 2 will cause the clutch to be off and  
switch on, 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. ACS/THERMAL PRT line voltage check:  
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1. Turn the ignition switch to LOCK (0).  
2. Disconnect the following connector.  
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HVAC control unit 32P connector  
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3. Turn the ignition switch to ON (II).  
4. Measure the voltage between test points 1 and 2.  
Test condition IG ON (II)  
HVAC control unit 32P connector: disconnected  
Test circuit ACS  
Test point 1 HVAC control unit 32P connector No. 25 (LT GRN)  
Test point 2 Body ground  
Fig. 43: Measuring Voltage Between Test Points 1 And 2  
Courtesy of AMERICAN HONDA MOTOR CO., INC.  
Is there battery voltage?  
YES : Go to step 5.  
NO : Go to step 6.  
5. Determine possible failure area (MICU, others):  
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1. Turn the ignition switch to LOCK (0).  
2. Reconnect the HVAC control unit 32P connector.  
3. Start the engine.  
4. Set the A/C button and the fan control dial to ON.  
5. Measure the voltage between test points 1 and 2.  
Test condition IG ON (II)  
Test circuit ACS  
Test point 1 HVAC control unit 32P connector No. 25 (LT GRN)  
Test point 2 Body ground  
Fig. 44: Measuring Voltage Between Test Points 1 And 2  
Courtesy of AMERICAN HONDA MOTOR CO., INC.  
Is there 0.2 V or less?  
YES : REPLACE THE UNDER-DASH FUSE/RELAY BOX .  
NO : Go to step 9.  
6. Open wire check (THERMO/THERMAL PRT line):  
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1. Turn the ignition switch to LOCK (0).  
2. Disconnect the following connector.  
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A/C compressor clutch 3P connector  
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3. Turn the ignition switch to ON (II).  
4. Measure the voltage between test points 1 and 2.  
Test condition IG ON (II)  
HVAC control unit 32P connector: disconnected  
A/C compressor clutch 3P connector: disconnected  
Test circuit THERMO  
Test point 1 A/C compressor clutch 3P connector No. 2 (LT BLU)  
Test point 2 Body ground  
Fig. 45: Measuring Voltage Between Test Points 1 And 2  
Courtesy of AMERICAN HONDA MOTOR CO., INC.  
Is there battery voltage?  
YES : THERMO/THERMAL PRT wire is OK. Go to step 7.  
NO : Go to step 8.  
7. A/C compressor thermal protector check:  
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1. Turn the ignition switch to LOCK (0).  
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2. TEST THE A/C COMPRESSOR THERMAL PROTECTOR .  
Is the A/C compressor thermal protector OK?  
YES : Repair an open in the wire between the HVAC control unit and the A/C compressor.  
NO : REPLACE THE A/C COMPRESSOR THERMAL PROTECTOR .  
8. MICU check:  
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1. Measure the voltage between test points 1 and 2.  
Test condition IG ON (II)  
Test circuit THERMAL PRT  
HVAC control unit 32P connector: disconnected  
A/C compressor clutch 3P connector: disconnected  
Test point 1 Under-dash fuse/relay box connector D (32P) No. 31 (WHT)  
Test point 2 Body ground  
Fig. 46: Measuring Voltage Between Test Points 1 And 2  
Courtesy of AMERICAN HONDA MOTOR CO., INC.  
Is there battery voltage?  
YES : Repair an open in the wire between the A/C compressor and the under-dash fuse/relay box.  
NO : REPLACE THE UNDER-DASH FUSE/RELAY BOX .  
9. Evaporator temperature sensor check:  
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1. Turn the ignition switch to LOCK (0).  
ο‚‘
2. Measure the resistance between test points 1 and 2.  
Test condition IG LOCK (0)  
HVAC control unit 32P connector: disconnected  
Test circuit TEVA, SENSOR COM  
Test point 1 HVAC control unit 32P connector No. 19 (ORN)  
Test point 2 HVAC control unit 32P connector No. 20 (GRY)  
Fig. 47: Measuring Resistance Between Test Points 1 And 2  
Courtesy of AMERICAN HONDA MOTOR CO., INC.  
Is resistance less than 24 kohms?  
YES : REPLACE THE HVAC CONTROL UNIT .  
NO : TEST THE EVAPORATOR TEMPERATURE SENSOR .  
A/C SIGNAL CIRCUIT TROUBLESHOOTING IDLE CONTROL SYSTEM  
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