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 MANUALSACURA2008CSX BASE, K20A3REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 17 (CLIMATE CONTROL SYSTEM)
2008 Acura CSX Base, K20A3
Section 17 (Climate Control System)
2008 Acura CSX Base, K20A3SECTION Section 17 (Climate Control System)
WARNING: This page is about a different car, the 2011 Acura TL, 2010 Acura TL, and 2009 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.
- HVAC (Heating, Ventilation, and Air Conditioning)
- Climate Control
- Component Location Index
- A/C Service Tips and Precautions
- A/C Refrigerant Oil Replacement
- 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
- System Description
- Circuit Diagram
- DTC Troubleshooting
- DTC U0155: Climate Control Unit Lost Communication with Gauge Control Module
- DTC B1215 or DTC indicator J and MODE: An Open or Short in the Recirculation Control 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 Evaporator Temperature Sensor Circuit
- DTC B1232 or DTC indicator H and AUTO: A Short in the 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 and MODE: An Open or Short in the Driver's Mode Control Motor Circuit
- DTC B1240 or DTC indicator B and MODE: A Problem in the Driver's Mode Control Linkage, Doors, or Motor Circuit
- DTC B1241 or DTC indicator C and MODE: A Problem in the Blower Motor Circuit
- DTC B1242 or DTC indicator E and MODE: An Open or Short in the Passenger's Mode Control Motor Circuit
- DTC B1243 or DTC indicator F and MODE: A Problem in the Passenger's Mode Control Linkage, Doors, or Motor Circuit
- DTC B2967 or DTC indicator A and Windshield Defrost: An Open in the Humidity Sensor Circuit
- DTC B2968 or DTC indicator B and Windshield Defrost: A Short in the Humidity Sensor Circuit
- DTC B2969: Climate Control Unit Lost Communication with Driver's MICU (WIPSW message)
- DTC B2979 or DTC indicator E and Windshield Defrost: An Open in the A/C Pressure Sensor Circuit
- DTC B2980 or DTC indicator F and Windshield Defrost: A short in the A/C Pressure Sensor Circuit
- DTC B2983 or DTC indicator K and MODE: A Problem in the Recirculation Control Linkage, Door, or Motor Circuit
- Climate Control Power and Ground Circuit Troubleshooting
- Navigation Communication Line Circuit Troubleshooting
- Audio Communication Line Circuit 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
- Evaporator Temperature Sensor Test
- Evaporator Temperature Sensor Replacement
- 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
- Driver's Mode Control Motor Test
- Driver's Mode Control Motor Replacement
- Passenger's Mode Control Motor Test
- Passenger's Mode Control Motor Replacement
- Recirculation Control Motor Test
- Recirculation Control Motor Replacement
- Climate Control Unit Removal/Installation
- Climate Control Switch Removal/Installation
- Dust and Pollen Filter Replacement
- Blower Unit Removal/Installation
- Blower Unit Component Replacement
- Evaporator Core & Expansion Valve Replacement
- Expansion Valve Replacement
- Heater Unit/Core Replacement
- 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 Check
- A/C System Noise Check
- 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.