Blinks)
1
2
An open in the air mix control motor circuit
A short in the air mix control motor circuit
A problem in the air mix control motor circuit, linkage, door, or
motor
3
4
5
6
7
8
An open in the mode control motor circuit
A short in the mode control motor circuit
A problem in the mode control motor circuit, linkage, door, or, motor
An open in the recirculation control motor circuit
A short in the recirculation control motor circuit
A problem in the recirculation control motor circuit, linkage, door,
or, motor
9
10
11
12
13
A problem in the blower motor circuit
HVAC control unit internal error
An open in the evaporator temperature sensor circuit
A short in the evaporator temperature sensor circuit
Canceling the read past DTC's
5. Turn the ignition switch to LOCK (0), to cancel the read past DTC's. After completing the repair work,
clear the DTCs.
HOW TO CLEAR THE PAST DTC'S
1. Turn the ignition switch to LOCK (0).
2. Set the fan control dial to OFF, temperature control dial to Max Cool, the VENTILATION button to ON.
3. Press and hold both the RECIRCULATION and WINDSHIELD DEFROSTER buttons, then turn the
ignition switch to ON (II).
4. After about 5 seconds the windshield defroster indicator starts to blink, release the buttons. The indicator
will blink 5 times then stop.
5. Do the display DTC function to verify DTC's have been cleared.
CLIMATE CONTROL SYSTEM SYMPTOM TROUBLESHOOTING INDEX
Symptom
Diagnostic Procedure
Also Check for
Climate control DTCs See
HOW TO
TROUBLESHOOT THE
BODY ELECTRICAL or
HOW TO
TROUBLESHOOT THE
CLIMATE CONTROL
SYSTEM
Probable cause: Climate control unit
malfunction
heater controls and the DO THE CLIMATE CONTROL
A/C system do not POWER AND GROUND CIRCUIT
The blower and the
work
TROUBLESHOOTING
Blown fuse No. B22 (7.5 A) in
the under-dash fuse/relay box
Poor ground at G502
Poor or loose connections at
the terminals
Climate control DTCs See
HOW TO
TROUBLESHOOT THE
BODY ELECTRICAL or
HOW TO
TROUBLESHOOT THE
CLIMATE CONTROL
SYSTEM
Probable cause: A/C pressure sensor
circuit malfunction
Troubleshoot the ACS circuit:
The A/C compressor
clutch and the A/C
condenser/radiator fans
are inoperative, but the
blower and heater
controls work
A/C PRESSURE SENSOR
CIRCUIT LOW VOLTAGE
PGM-FI DTCs See HOW TO
TROUBLESHOOT THE
BODY ELECTRICAL or
HOW TO
A/C PRESSURE SENSOR
CIRCUIT HIGH VOLTAGE
TROUBLESHOOT THE
CLIMATE CONTROL
SYSTEM
NOTE:
The ACS circuit can malfunction without
setting a DTC
A/C SIGNAL CIRCUIT
TROUBLESHOOTING
Poor or loose connections at
the terminals
Climate control DTCs See
HOW TO
TROUBLESHOOT THE
BODY ELECTRICAL or
HOW TO
TROUBLESHOOT THE
CLIMATE CONTROL
SYSTEM
The A/C compressor
clutch does not engage,
but the A/C
condenser/radiator fans
operate, and the blower
and heater controls
work
Probable cause: No power to the A/C
compressor clutch
Do the A/C COMPRESSOR CLUTCH
CIRCUIT TROUBLESHOOTING
Blown fuse No. A27 (7.5 A) in
the under-hood fuse/relay box
A/C System Test
Poor or loose connections at
the terminals
Climate control DTCs See
HOW TO
TROUBLESHOOT THE
BODY ELECTRICAL or
HOW TO
TROUBLESHOOT THE
CLIMATE CONTROL
SYSTEM
PGM-FI DTCs See HOW TO
TROUBLESHOOT THE A/T
SYSTEM or HOW TO
TROUBLESHOOT THE
FUEL AND EMISSIONS
SYSTEMS
The A/C condenser fan
and the radiator fan do
not run at low speed
with the A/C on, but
the blower and heater
controls work normally
Probable cause: A/C condenser/radiator
fan low speed circuit malfunction
Do the RADIATOR AND A/C
CONDENSER FAN LOW SPEED
CIRCUIT TROUBLESHOOTING
Blown fuse No. A2-11 (20 A)
in the under-hood fuse/relay
box
Poor ground at G302
Poor or loose connections at
the terminals
Climate control DTCs See
HOW TO
TROUBLESHOOT THE
BODY ELECTRICAL or
HOW TO
TROUBLESHOOT THE
CLIMATE CONTROL
SYSTEM
Probable cause: Malfunction in the fan(s)
high speed circuit
Do the following troubleshooting as
needed:
The A/C
condenser/radiator fans
do not run at high
speed, but do run at
low speed with the
A/C on
PGM-FI DTCs See HOW TO
TROUBLESHOOT THE A/T
SYSTEM or HOW TO
TROUBLESHOOT THE
FUEL AND EMISSIONS
SYSTEMS
A/C CONDENSER FAN HIGH
SPEED CIRCUIT
TROUBLESHOOTING
RADIATOR FAN HIGH SPEED
CIRCUIT TROUBLESHOOTING
Poor ground at G302
Poor or loose connections at
the terminals
Climate control DTCs See
HOW TO
TROUBLESHOOT THE
BODY ELECTRICAL or
HOW TO
TROUBLESHOOT THE
CLIMATE CONTROL
SYSTEM
Blower fan runs slower
than expected in cold
weather (when in
AUTO mode)
Probable cause: Engine coolant
temperature (ECT) circuit malfunction
Troubleshooting the ECT sensor circuit:
NOTE:
ECT SENSOR 2 CIRCUIT LOW
VOLTAGE
It is normal for the
blower fan to run
slowly until the
coolant temperature
rises when in AUTO
mode
PGM-FI DTCs See HOW TO
TROUBLESHOOT THE A/T
SYSTEM or HOW TO
TROUBLESHOOT THE
FUEL AND EMISSIONS
SYSTEMS
ECT SENSOR 2 CIRCUIT HIGH
VOLTAGE
Blower motor operation
Probable cause:
A/C system is overcharged
Climate control DTCs See HOW
TO TROUBLESHOOT THE
BODY ELECTRICAL or HOW
TO TROUBLESHOOT THE
CLIMATE CONTROL SYSTEM
Radiator and/or A/C condenser fan
inoperative
The A/C compressor
clutch cycles rapidly
on and off
Excessive pressure on high side of
system causing pressure sensor to
turn A/C compressor off
Thermal protector problem
Low idle speed
HDS does not
communicate with the TROUBLESHOOT THE DLC
climate control unit or CIRCUIT
the vehicle
1. Check the motor linkage See AIR
MIX CONTROL MOTOR
REMOVAL AND
INSTALLATION , DRIVER'S
AIR MIX CONTROL MOTOR
REMOVAL AND
INSTALLATION or
PASSENGER'S AIR MIX
CONTROL MOTOR REMOVAL
AND INSTALLATION
2. CHECK THE COOLANT LEVEL
3. CHECK THE RADIATOR CAP
4. Check the engine coolant
temperature (ECT) during normal
operation with the HDS
CLIMATE CONTROL DTCS
Damaged cylinder head gasket
Insufficient heating
5. Check the heater core inlet hose
temperature:
If it is COLD, check for
restrictions in the hose, a
damaged or leaking
thermostat, or a damaged or
leaking water pump
If it is HOT, check for
restrictions in the heater core.
Back flush or replace the
heater core See AIR MIX
CONTROL MOTOR TEST
or DRIVER'S AIR MIX
CONTROL MOTOR TEST
or PASSENGER'S AIR
MIX CONTROL MOTOR
TEST
6. Do the driver's air mix control
motor test and passenger's air mix
control motor test See HOW TO
TROUBLESHOOT THE BODY
ELECTRICAL or HOW TO
TROUBLESHOOT THE
CLIMATE CONTROL SYSTEM
7. Check the blower motor unit for
obstructions
8. Check for air leaks around the ducts
and vents
HEATING AND A/C SYSTEMS SYMPTOM TROUBLESHOOTING INDEX
Symptom
Diagnostic Procedure
Also Check for
HVAC DTCS
Blown fuse No. B22 (7.5 A) in
the under-dash fuse/relay box
Probable cause: HVAC control unit
malfunction
DO THE HVAC CONTROL POWER
AND GROUND CIRCUIT
TROUBLESHOOTING
The blower and the
heater controls and the
A/C system do not
work
Faulty blower motor relay
Poor ground at G502
Poor or loose connections at
the terminals
HVAC DTCS
PGM-FI DTCs See HOW TO
TROUBLESHOOT THE
A/T SYSTEM or HOW TO
TROUBLESHOOT THE
FUEL AND EMISSIONS
SYSTEMS
Probable cause: A/C request or thermal
protector circuit malfunction
Do the A/C troubleshooting:
The A/C compressor
clutch and the A/C
condenser/radiator fans
are inoperative, but the
blower and heater
controls work
A/C CIRCUIT LOW VOLTAGE
A/C CIRCUIT HIGH VOLTAGE
A/C signal circuit
troubleshooting See A/C
SIGNAL CIRCUIT
NOTE:
TROUBLESHOOTING or
A/C SIGNAL CIRCUIT
TROUBLESHOOTING
The A/C pressure sensor circuit can
malfunction without setting a DTC
Poor or loose connections at
the terminals
HVAC DTCS
The A/C compressor
clutch does not engage, Probable cause: No power to the A/C
but the A/C compressor clutch
Blown fuse No. A27 (7.5 A) in
the under-hood fuse/relay box
2024 Honda CR-V Owner's Manual
2023 Honda CR-V Owner's Manual
2021 Honda CR-V Owner's Manual
2018 Honda CR-V Owner's Manual
2015 Honda CR-V Owner's Manual
