Section 90 (HVAC System - Testing & Troubleshooting)
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2025 Honda Odyssey, 2024 Honda Odyssey, 2023 Honda Odyssey, 2022 Honda Odyssey, and 2021 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.
- Check
- General Information
- Symptom Troubleshooting Index for Viewer
- Driver's and passenger's side vent temperatures vary by more than 20°F (11°C)
- HDS does not communicate with the climate control unit or the vehicle
- Insufficient heating
- The A/C compressor clutch and the A/C condenser/radiator fans are inoperative, but the blower and heater controls work
- The A/C compressor clutch does not disengage when the A/C switch is off
- The A/C compressor clutch does not engage, but the A/C condenser/radiator fans operate, and the blower and heater controls work
- The A/C compressor relief valve has vented refrigerant NOTE: This indicates the A/C system high side pressure was high
- The A/C condenser/radiator fans do not run at high speed, but do run at low speed
- The A/C condenser/radiator fans do not run at low speed with the A/C on, but the blower and heater controls work normally
- The blower and heater controls and the A/C system do not work
- The blower fan runs slower than expected in cold weather (when in AUTO mode) NOTE: It is normal for the blower fan to run slowly until the coolant temperature rises when in AUTO mode
- Diagnosis
- Removal & Installation, Inspection
- How to Information
- How to Troubleshoot the Climate Control System
- How to Check for DTCs with the HDS
- How to Use the Self-Diagnostic Function with the HDS
- How to Use the Self-Diagnostic Function without the HDS
- Checking for DTCs
- How to Check for History DTCs
- How to Clear History DTCs
- Displaying Sensor Inputs at the Climate Control Unit
- Checks Before Using the Sensor Input Display Mode
- Run the Sensor Input Display Mode
- How to Troubleshoot the Climate Control System
- Component Location Index
- Description & Operation
- Repair Regeneration
- Replacement
- Inspection
- Connector View
- Circuit Diagram
- Symptom Troubleshooting
- Climate Control System Symptom Troubleshooting - The A/C compressor clutch does not engage, but the A/C condenser/radiator fans operate, and the blower and heater controls work
- Climate Control System Symptom Troubleshooting - The A/C condenser/radiator fans do not run at high speed, but do run at low speed with the A/C on
- Climate Control System Symptom Troubleshooting - The A/C condenser/radiator fans do not run at low speed with the A/C on, but the blower and heater controls work normally
- Climate Control System Symptom Troubleshooting - The blower and heater controls and the A/C system do not work
- Symptom Troubleshooting Index
- Test