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 MANUALSACURA2009MDXREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)A/C COMPRESSORCLIMATE CONTROL SYSTEM
2009 Acura MDX
Climate Control System
2009 Acura MDXSECTION Climate Control System
- Component Location Index
- A/C Service Tips and Precautions
- A/C Refrigerant Oil Replacement
- Front A/C Line Replacement
- A/C System Inspection
- General Troubleshooting Information
- 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
- Displaying Sensor Inputs at the Climate Control Unit
- Check these items before using the sensor input display mode
- To run the sensor input display mode, follow these steps
- DTC Troubleshooting Index
- Symptom Troubleshooting Index
- Notes
- System Description
- Humidity/In-car Temperature Sensor
- Humidity/In-car Temperature Sensor Quality
- A/C Pressure Sensor
- Climate Control Door Positions
- Dual Air Mix Control System
- i-Dual and i-Tri Climate Control System (With navigation system)
- Climate Control Unit Inputs and Outputs
- Rear Climate Control Unit Inputs and Outputs
- Circuit Diagram
- DTC Troubleshooting
- DTC B1202: Climate Control Unit Internal Error
- DTC B1205: Climate Control Unit Lost Communication with Gauge Control Module (VSP/NE message); DTC B1206 or DTC indicator AUTO: Climate Control Unit Lost Communication with Gauge Control Module (ECT message); DTC B1207: Climate Control Unit Lost Communication with Gauge Control Module (ILLUMI message)
- DTC B1213 or DTC indicator N: An Open in the Rear Evaporator Temperature Sensor Circuit
- DTC B1214 or DTC indicator P: A Short in the Rear Evaporator Temperature Sensor Circuit
- DTC B1215 or DTC indicator J: An Open or Short in the Recirculation Control Motor Circuit
- DTC B1223 or DTC indicator M: A Problem in the Rear Blower Motor Circuit
- DTC B1225 or DTC indicator A and AUTO: An Open in the In-car Temperature Sensor Circuit
- DTC B1226 or DTC indicator B and AUTO: A Short in the In-car Temperature Sensor Circuit
- DTC B1227 or DTC indicator C and AUTO: An Open in the Outside Air Temperature Sensor Circuit
- DTC B1228 or DTC indicator D and AUTO: A Short in the Outside Air Temperature Sensor Circuit
- DTC B1229 or DTC indicator E and AUTO: An Open in the Sunlight Sensor Circuit
- DTC B1230 or DTC indicator F and AUTO: A Short in the Sunlight Sensor Circuit
- DTC B1231 or DTC indicator G and AUTO: An Open in the Front Evaporator Temperature Sensor Circuit
- DTC B1232 or DTC indicator H and AUTO: A Short in the Front Evaporator Temperature Sensor Circuit
- DTC B1233 or DTC indicator J and AUTO: An Open in the Driver's Air Mix Control Motor Circuit
- DTC B1234 or DTC indicator K and AUTO: A Short in the Driver's Air Mix Control Motor Circuit
- DTC B1235 or DTC indicator L and AUTO: A Problem in the Driver's Air Mix Control Linkage, Door, or Motor Circuit
- DTC B1236 or DTC indicator M and AUTO: An Open in the Passenger's Air Mix Control Motor Circuit
- DTC B1237 or DTC indicator N and AUTO: A Short in the Passenger's Air Mix Control Motor Circuit
- DTC B1238 or DTC indicator P and AUTO: A Problem in the Passenger's Air Mix Control Linkage, Door, or Motor Circuit
- DTC B1239 or DTC indicator A: An Open or Short in the Front Mode Control Motor Circuit
- DTC B1240 or DTC indicator B: A Problem in the Front Mode Control Linkage, Doors, or Motor Circuit
- DTC B1241 or DTC indicator C: A Problem in the Front Blower Motor Circuit
- DTC B1244 or DTC indicator F: An Open in the Rear Air Mix Control Motor Circuit
- DTC B1245 or DTC indicator G: A Short in the Rear Air Mix Control Motor Circuit
- DTC B1246 or DTC indicator H: A Problem in the Rear Air Mix Control Linkage, Door, or Motor Circuit
- DTC B2965: Climate Control Unit Lost Communication with Rear Climate Control Panel
- DTC B2967 or DTC indicator A and WINDSHIELD DEFROST: An Open in the Humidity Sensor Circuit
- DTC B2968 or DTC indicator A and WINDSHIELD DEFROST: A Short in the Humidity Sensor Circuit
- DTC B2969: Climate Control Unit Lost Communication with Combination Switch Control Unit (WIPSW message)
- DTC B2970: Climate Control Unit Lost Communication with Relay Control Module (RM message)
- DTC B2979 or DTC indicator B and WINDSHIELD DEFROST: An Open in the A/C Pressure Sensor Circuit
- DTC B2980 or DTC indicator B and WINDSHIELD DEFROST: A short in the A/C Pressure Sensor Circuit
- DTC B2981: Climate Control Unit Lost Communication with Navigation Unit
- DTC B2983 or DTC indicator K: A problem in the Recirculation Control Linkage, Door, or Motor Circuit
- DTC B2991: Climate Control Unit Lost Communication with Audio Unit
- Rear Mode Control Motor Circuit Troubleshooting
- Climate Control Unit Troubleshooting
- Radiator and A/C Condenser Fan Low Speed Circuit Troubleshooting
- A/C Condenser Fan High Speed Circuit Troubleshooting
- A/C Compressor Clutch Circuit Troubleshooting
- Humidity/In-car Temperature Sensor Test
- Humidity/In-car Temperature Sensor Replacement
- Outside Air Temperature Sensor Test
- Outside Air Temperature Sensor Replacement
- Sunlight Sensor Test
- Sunlight Sensor Replacement
- Front Evaporator Temperature Sensor Test
- Front Evaporator Temperature Sensor Replacement
- Front Power Transistor Test
- Driver's Air Mix Control Motor Test
- Driver's Air Mix Control Motor Replacement
- Passenger's Air Mix Control Motor Test
- Passenger's Air Mix Control Motor Replacement
- Front Mode Control Motor Test
- Front Mode Control Motor Replacement
- Recirculation Control Motor Test
- Recirculation Control Motor Replacement
- Climate Control Unit Removal/ Installation
- Dust and Pollen Filter Replacement
- Blower Unit Removal/Installation
- Blower Unit Component Replacement
- Front Expansion Valve Replacement
- Front Evaporator Core Replacement
- Heater Unit/Core Replacement
- Heater Valve Cable Adjustment
- A/C Compressor Replacement
- A/C Compressor Clutch Check
- A/C Compressor Clutch Overhaul
- A/C Compressor Relief Valve Replacement
- A/C Condenser Replacement
- Receiver/Dryer Desiccant Replacement
- Refrigerant Recovery
- System Evacuation
- System Charging
- Refrigerant Leak Test
- A/C System Test
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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.