Honda HR-V: A/C Signal Circuit Troubleshooting (KA)
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 ON: The A/C condenser fan, the radiator fan, or the
A/C compressor. Refer to the symptom troubleshooting index - Refer to:
Heating and A/C Systems Symptom Troubleshooting
Index (Heating/Air Conditioning), or Climate Control System Symptom
Troubleshooting Index
(Climate Control).
- Do not use this troubleshooting procedure if the A/C system pressure is
abnormal.
- Do not use this troubleshooting procedure if the blower motor does not
run.
- Before doing symptom troubleshooting, check for PGM-FI DTCs - Refer to:
How to Troubleshoot the
Fuel and Emissions Systems, or How to Troubleshoot the CVT System (CVT).
1. PGM-FI system parameter check:
- Connect the HDS to the DLC.
- Start the engine.
- Set the A/C button and the heater fan switch to ON.
- Check the parameter(s) below with the HDS.
Do the current condition(s) match the threshold?
YES
Go to the A/C compressor clutch circuit troubleshooting - Refer to: A/C
Compressor Clutch Circuit
Troubleshooting (KA/KC), or A/C Compressor Clutch Circuit Troubleshooting (KA/KX).
NO
A/C SWITCH is OFF, go to step 4.
NO
A/C SWITCH is ON and A/C CLUTCH is OFF, go to step 2.
2. A/C pressure sensor performance check:
Check the parameter(s) below with the HDS.
Do the current condition(s) match the threshold?
YES
Go to step 3.
NO
Go to A/C system test.
3. Evaporator temperature sensor check:
- Turn the vehicle to the OFF (LOCK) mode.
- Test the evaporator temperature sensor.
Is the evaporator temperature sensor OK?
YES
Update the PCM if it does not have the latest software, or substitute a
known-good PCM, and
recheck.
NO
Replace the evaporator temperature sensor.
4. Heater fan switch check:
- Turn the vehicle to the OFF (LOCK) mode.
- Test the heater fan switch.
Is the heater fan switch OK?
YES
Go to step 5.
NO
Replace the heater fan switch.
5. Determine possible failure area (ACS line, A/C SW- line):
- Turn the vehicle to the ON mode.
- Measure the voltage between test points 1 and 2.
Is there battery voltage?
YES
Go to step 7.
NO
Go to step 6.
6. Open wire check (A/C SW- line):
Measure the voltage between test points 1 and 2.
Is there battery voltage?
YES
Replace the HVAC control unit.
NO
Repair an open in the wire between the heater fan switch and the HVAC control
unit.
7. Open wire check (ACS line):
- Turn the vehicle to the OFF (LOCK) mode.
- Disconnect the following connector.
HVAC control unit 16P connector
- Turn the vehicle to the ON mode.
- Measure the voltage between test points 1 and 2.
Is there battery voltage?
YES
Replace the HVAC control unit.
NO
Go to step 8.
8. Open wire check (ACS line):
Measure the voltage between test points 1 and 2.
Is there battery voltage?
YES
Repair an open in the wire between the MICU and the HVAC control unit.
NO
Replace the under-dash fuse/relay box
READ NEXT:
1. Problem verification 1:
Turn the vehicle to the OFF (LOCK) mode, and the heater fan switch ON.
Does the blower motor stop?
YES
The failure is not duplicated, go to step 2.
NO
The failure is duplica
NOTE: Do this troubleshooting procedure only if sent here by symptom
troubleshooting index - Refer to:
Heating and A/C Systems Symptom Troubleshooting Index (Heating/Air
Conditioning), or Climate
Co
CLIMATE CONTROL UNIT CONNECTOR FOR INPUTS AND OUTPUTS
Climate Control Unit Connector A (32P)
Climate Control Unit Connector B (12P)*
*:Dual A/C type
Climate Control Unit Connector A (32P)
Climate
SEE MORE:
EPS DTC TROUBLESHOOTING INDEX
TESTING
EPS CONTROL UNIT UPDATE
Special Tools Required
MVCI unit with the latest control module (CM)
update software installed
1. EPS Control Unit - Update
NOTE: Check any official service website for more information about updating
the MVCI and control
units
ENTRY LIGHTS CONTROL SYSTEM CIRCUIT DIAGRAM
INTERIOR LIGHTS CIRCUIT DIAGRAM
WIRING DIAGRAM
AMBIENT LIGHT, CARGO AREA LIGHT, CEILING LIGHT, GLOVE BOX LIGHT,
INDIVIDUAL
MAP LIGHTS AND VANITY MIRROR LIGHTS ELECTRONIC WIRING DIAGRAM
Refer to: Interior Lights
DASHLIGHTS ELECTRONIC WIRING DIAGRAM
Ref