Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSHONDA2009ODYSSEY EX-LREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSCLIMATE CONTROLSYMPTOM TROUBLESHOOTING INDEX

2009 Honda Odyssey EX-L

Symptom Troubleshooting Index

2009 Honda Odyssey EX-LSECTION Symptom Troubleshooting Index

SYMPTOM TROUBLESHOOTING CHART

Symptom	Diagnostic procedure	Also check for
Recirculation control doors do not change between Fresh and Recirculate	Recirculation control motor circuit troubleshooting (see RECIRCULATION CONTROL MOTOR CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Blown fuse No. 30 (10 A) in the driver's under-dash fuse/relay box Cleanliness and tightness of all connectors
Voice communication does not work	Navigation communication line circuit troubleshooting (see NAVIGATION COMMUNICATION LINE CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Cleanliness and tightness of all connectors
Climate Control panel does not work	Climate control panel power and ground circuit troubleshooting (see CLIMATE CONTROL PANEL POWER AND GROUND CIRCUIT TROUBLESHOOTING )	Poor ground at G504 Cleanliness and tightness of all connectors
Rear control panel does not work	Rear control panel power and ground circuit troubleshooting (see REAR CONTROL PANEL POWER AND GROUND CIRCUIT TROUBLESHOOTING )	Poor ground at G601 Cleanliness and tightness of all connectors
Blower, heater controls, and A/C do not work	Front climate control unit power and ground circuit troubleshooting (see FRONT CLIMATE CONTROL UNIT POWER AND GROUND CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Blown fuse No. 30 (10 A) in the driver's under-dash fuse/relay box Poor ground at G504 Cleanliness and tightness of all connectors
Rear blower, rear heater controls, and rear A/C do not work	Rear climate control unit power and ground circuit troubleshooting (see REAR CLIMATE CONTROL UNIT POWER AND GROUND CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Blown fuse No. 30 (10 A) in the driver's under-dash fuse/relay box Poor ground at G652 Cleanliness and tightness of all connectors
Both fans do not run at low speed with the A/C on (but the A/C compressor runs with the A/C on)	Radiator and A/C condenser fan low speed circuit troubleshooting (see RADIATOR AND A/C CONDENSER FAN LOW SPEED CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Blown fuse No. 9 (30 A) in the under-hood fuse/relay box, and No. 30 (10 A) in the driver's under-dash fuse/relay box Poor ground at G301 Cleanliness and tightness of all connectors
The A/C condenser fan does not run at high speed (but both fans run at low speed and the A/C compressor operates with the A/C on)	A/C condenser fan high speed circuit troubleshooting (see A/C CONDENSER FAN HIGH SPEED CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Blown fuse No. 30 (10 A) in the driver's under-dash fuse/relay box Poor ground at G201 Cleanliness and tightness of all connectors
Both fans do not run at high speed with the A/C on (but both fans run at low speed and the A/C compressor operates with the A/C on)	Radiator and A/C condenser fan high speed circuit troubleshooting (see RADIATOR AND A/C CONDENSER FAN HIGH SPEED CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Cleanliness and tightness of all connectors
The A/C compressor clutch does not engage (but both fans run with the A/Con)	A/C compressor clutch circuit troubleshooting (see A/C COMPRESSOR CLUTCH CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Blown fuse No. 12 (7.5 A) in the under-hood fuse/relay box, and No. 30 (10 A) in the driver's under-dash fuse/relay box Cleanliness and tightness of all connectors
A/C system does not come on (both fans and the A/C compressor do not work); heater is OK	A/C pressure switch circuit troubleshooting (see A/C PRESSURE SWITCH CIRCUIT TROUBLESHOOTING )	Body DTCs in B-CAN System Diagnosis Test Mode A Troubleshooting (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ) HVAC DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Cleanliness and tightness of all connectors
Blower fan runs slower than expected in cold weather	ECT Troubleshooting: ECT sensor 1 circuit low voltage (see DTC P0117: ECT SENSOR 1 CIRCUIT LOW VOLTAGE ), ECT sensor 1 circuit high voltage (see DTC P0118: ECT SENSOR 1 CIRCUIT HIGH VOLTAGE ) NOTE: It is normal for the blower to run slowly until the engine coolant temperature begins to rise. If the blower continues to run slowly for an abnormal length of time, continue to troubleshoot the problem.	Powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION )
Both fans run at high speed all the time with the A/C on	Radiator and A/C condenser fan high speed circuit troubleshooting (see RADIATOR AND A/C CONDENSER FAN HIGH SPEED CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Cleanliness and tightness of all connectors
HDS does not communicate with the climate control unit or the vehicle	Troubleshooting the DLC circuit (see DLC CIRCUIT TROUBLESHOOTING )

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.