Symptom Troubleshooting Index

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2015 Honda Crosstour, 2014 Honda Crosstour, 2013 Honda Crosstour, 2012 Honda Crosstour, and 2011 Honda Accord Crosstour. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM TROUBLESHOOTING INDEX

Symptom	Diagnostic procedure	Also check for
The blower and heater controls and the A/C system do not work	Probable cause: Climate control unit malfunction Do the climate control power and ground circuit troubleshooting (see CLIMATE CONTROL POWER AND GROUND CIRCUIT TROUBLESHOOTING )	Climate control DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Blown fuse No. B16 (7.5 A) in the driver's under-dash fuse/relay box Poor ground at G502 (see AUDIO WIRE HARNESS (WITH NAVIGATION SYSTEM) (AA) ) Poor or loose connections at the terminals
The A/C compressor clutch and the A/C condenser/radiator fans are inoperative, but the blower and heater controls work	Probable cause: A/C pressure sensor circuit malfunction Do the pressure sensor troubleshooting: A/C pressure sensor circuit low voltage (see DTC P0532: A/C PRESSURE SENSOR CIRCUIT LOW VOLTAGE ), A/C pressure sensor circuit high voltage (see DTC P0533: A/C PRESSURE SENSOR CIRCUIT HIGH VOLTAGE ) NOTE: The A/C pressure sensor can malfunction without setting a DTC	B-CAN U-codes, loss of communication Climate control DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Poor or loose connections at the terminals
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 (see A/C COMPRESSOR CLUTCH CIRCUIT TROUBLESHOOTING )	Climate control DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Blown fuse No. A20 (7.5 A) in the under-hood fuse/relay box A/C system pressure is normal (see A/C SYSTEM TEST ) Poor or loose connections at the terminals ECT Engine overheating
The condenser/radiator fans do not run at low speed with the A/C on, but the blower and heater controls work normally	Probable cause: Condenser/radiator fan low speed circuit malfunction Do the radiator and A/C condenser fan low speed circuit troubleshooting (see RADIATOR AND A/C CONDENSER FAN LOW SPEED CIRCUIT TROUBLESHOOTING ) Probable cause: A/C pressure sensor circuit malfunction Do the pressure sensor troubleshooting: A/C pressure sensor circuit low voltage (see DTC P0532: A/C PRESSURE SENSOR CIRCUIT LOW VOLTAGE ), A/C pressure sensor circuit high voltage (see DTC P0533: A/C PRESSURE SENSOR CIRCUIT HIGH VOLTAGE ) NOTE: The A/C pressure sensor can malfunction without setting a DTC	Climate control DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Blown No. A3-8 (SUB FAN) (30 A) in the under-hood fuse/relay box Poor ground at G301 (see LEFT ENGINE COMPARTMENT WIRE HARNESS (ENGINE COMPARTMENT BRANCH) (BD) ) Poor or loose connections at the terminals
The condenser/radiator fans do not run at high speed, but do run at low speed	Probable cause: Malfunction in the fan(s) high speed circuit Do the following troubleshooting as needed: A/C condenser fan high speed circuit troubleshooting (see A/C CONDENSER FAN HIGH SPEED CIRCUIT TROUBLESHOOTING ) Radiator fan high speed circuit troubleshooting (see RADIATOR FAN HIGH SPEED CIRCUIT TROUBLESHOOTING ) Probable cause: A/C pressure sensor circuit malfunction Do the pressure sensor troubleshooting: A/C pressure sensor circuit low voltage (see DTC P0532: A/C PRESSURE SENSOR CIRCUIT LOW VOLTAGE ), A/C pressure sensor circuit high voltage (see DTC P0533: A/C PRESSURE SENSOR CIRCUIT HIGH VOLTAGE ) NOTE: The A/C pressure sensor can malfunction without setting a DTC	Climate control DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Blown fuses No. A4 (20 A) and No. A3-6 (MAIN FAN) (30 A) in the under-hood fuse/relay box Poor ground at G301 (see LEFT ENGINE COMPARTMENT WIRE HARNESS (ENGINE COMPARTMENT BRANCH) (BD) ) Poor or loose connections at the terminals
Voice commands do not work (with navigation system)	Probable cause: Communication problem between the climate control unit and the navigation system Do the navigation communication line circuit troubleshooting (see NAVIGATION COMMUNICATION LINE CIRCUIT TROUBLESHOOTING )	Climate control DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Navigation System Links (see SYSTEM DIAGNOSTIC MODE ) Poor or loose connections at the terminals
The climate control display is inoperative	Probable cause: Communication problem between the climate control unit and the Audio-HVAC subdisplay unit (with navigation system) or the Audio-HVAC display unit (without navigation system) Do the audio communication line circuit troubleshooting; with navigation system (see WITH NAVIGATION SYSTEM ), without navigation system (see WITHOUT NAVIGATION SYSTEM )	Climate control DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Audio-HVAC subdisplay unit or audio-HVAC display unit failure Poor or loose connections at the terminals
Blower fan runs slower than expected in cold weather (when in AUTO mode)	Probable cause: Engine coolant temperature (ECT) circuit malfunction Troubleshoot the ECT sensor circuit: ECT sensor 2 circuit low voltage (see DTC P2184: ECT SENSOR 2 CIRCUIT LOW VOLTAGE ) ECT sensor 2 circuit high voltage (see DTC P2185: ECT SENSOR 2 CIRCUIT HIGH VOLTAGE )	Climate control DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Blower motor operation
The A/C compressor clutch cycles rapidly on and off	Probable cause: The A/C system is very low on refrigerant, indicating a possible leak Do the refrigerant leak check (see REFRIGERANT LEAK CHECK ) and repair any leaks. Replace the receiver/dryer (see RECEIVER/DRYER DESICCANT REPLACEMENT ), then recharge the system to specifications (see SYSTEM CHARGING )	Climate control DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) If there is no leak and the refrigerant level is normal, do the A/C compressor clutch circuit troubleshooting (see A/C COMPRESSOR CLUTCH CIRCUIT TROUBLESHOOTING ), and look for an intermittent problem. Low idle ECT
Warm air comes out of the vents, and the high pressure liquid line is very hot	Probable cause: The A/C system is overcharged (too much refrigerant), or the A/C condenser is malfunctioning Recover A/C refrigerant (see REFRIGERANT RECOVERY ), then check the condenser for restrictions or poor airflow. Repair as needed. Recharge the system to specifications (see SYSTEM CHARGING )	Incorrect tension or abnormal wear on the drive belt. Replace the belt and/or the belt tensioner as needed. Proper operation of the A/C condenser/radiator fans. Repair as needed. Signs of an overheated engine. Repair as needed.
Warm air comes out of the vents. The suction line is cool to warm, and the discharge line is warm to hot	Probable cause: The A/C system is low on refrigerant, indicating a possible leak Do the refrigerant leak check (see REFRIGERANT LEAK CHECK ) and repair any leaks. Recharge the system to specifications (see SYSTEM CHARGING )	Climate control DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Add refrigerant oil depending on the part you replaced (see A/C REFRIGERANT OIL REPLACEMENT )
Warm air comes out of the vents. The suction line is cool to warm, the discharge line is warm to hot, and there is no frost on the expansion valve	Probable cause: Excessive air and/or moisture in the system, indicating a possible leak Do the refrigerant leak check (see REFRIGERANT LEAK CHECK ) and repair any leaks. Replace the receiver/dryer (see RECEIVER/DRYER DESICCANT REPLACEMENT ), then recharge the system to specifications (see SYSTEM CHARGING )	Climate control DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Check the amount of refrigerant oil in the system. Adjust the oil level as needed (see A/C REFRIGERANT OIL REPLACEMENT ).
Warm air comes out of the vents. The liquid line or the condenser outlet is abnormally cool, or there is frost or condensation on the receiver/dryer	Probable cause: A restriction in the high-pressure side of the system Recover A/C refrigerant (see REFRIGERANT RECOVERY ), then check the liquid line, the receiver/dryer, and the A/C condenser for restrictions. Repair as needed. Recharge the system to specifications (see SYSTEM CHARGING )	Climate control DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS )
There is heavy frost or condensation on the expansion valve, and frost on the suction line	Probable cause: A restriction in the low-pressure side of the system Recover A/C refrigerant (see REFRIGERANT RECOVERY ), then check the suction line and the expansion valve for restrictions. Repair as needed. Recharge the system to specifications (see SYSTEM CHARGING )	Climate control DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS )
Warm air comes out of the vents, but A/C command is normal (A/C switch and clutch are on)	Probable cause: A/C compressor failure Do the A/C system test (see A/C SYSTEM TEST ), and correct any problems. If necessary, replace the A/C compressor (see A/C COMPRESSOR REPLACEMENT )	Climate control DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Add refrigerant oil depending on the part you replaced (see A/C REFRIGERANT OIL REPLACEMENT )
Driver's and passenger's side vent temperatures vary by more than 20 °F (11 °C)	Probable causes: The recirculation control door or the air mix doors are malfunctioning Do the following troubleshooting: Recirculation control motor test (see RECIRCULATION CONTROL MOTOR TEST ) Driver's air mix control motor test (see DRIVER'S AIR MIX CONTROL MOTOR TEST ) Passenger's air mix control motor test (see PASSENGER'S AIR MIX CONTROL MOTOR TEST )	Climate control DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Poor or loose connections at the terminals
Warm air comes out of the vents, and there is frost on the expansion valve	Probable cause: The expansion valve is stuck closed Replace the expansion valve (see EXPANSION VALVE REPLACEMENT )	Climate control DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Check the old expansion valve for contamination. If contaminants are found, replace the A/C system component (see A/C LINE REPLACEMENT ) that caused the contamination.
The temperature of the liquid line is the same on both sides of the expansion valve, and the evaporator coil or suction line has heavy condensation	Probable cause: The expansion valve is stuck open Replace the expansion valve (see EXPANSION VALVE REPLACEMENT )	Climate control DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Check the old expansion valve for contamination. If contaminants are found, replace the A/C system component (see A/C LINE REPLACEMENT ) that caused the contamination.
HDS does not communicate with the climate control unit or the vehicle	Troubleshoot the DLC circuit (see DLC CIRCUIT TROUBLESHOOTING )
Insufficient heating	Check the coolant level (see COOLANT CHECK ) Check the radiator cap (see RADIATOR CAP TEST ) Check the coolant temperature during normal operation 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 Do the driver's air mix control motor test (see DRIVER'S AIR MIX CONTROL MOTOR TEST ) and passenger's air mix control motor test (see PASSENGER'S AIR MIX CONTROL MOTOR TEST ) Check the blower motor unit for obstructions Check for air leaks around the ducts and vents	Climate control DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Damaged cylinder head gasket