2017-2019 Honda CR-V A/C Control Module: Programming, TSBs, and Replacement Guide

Symptoms of a Failing A/C Control Module

When the A/C control module in a 2017-2019 Honda CR-V begins to fail, it can cause a range of confusing symptoms. Because the module controls the entire HVAC system, a fault can mimic other problems, like a bad blower motor or blend door actuator. Here are the most common signs that point to the module itself:

• Incorrect Temperature Output: The most frequent complaint is air that is the wrong temperature—for example, hot air blowing when the A/C is on, or cold air when the heat is on.
• Unresponsive Controls: Buttons or knobs on the climate control panel may stop working or only work intermittently.
• Blower Fan Issues: The fan may be stuck on one speed, not work at all, or run continuously even when turned off.
• Incorrect Airflow Direction: The system may be stuck on one setting (like defrost or floor vents) and won't switch to other vents when you press the button.
• System is Completely Dead: In some cases, the entire climate control panel may go dark and become completely unresponsive.

A professional scan tool that can read Honda-specific Body (B-series) Diagnostic Trouble Codes (DTCs) is essential for accurate diagnosis. A code like B2964 indicates a communication loss between the climate control unit and the front panel, pointing directly to a module or wiring issue.

Known Issues, TSBs, and Recalls

While there are no direct recalls for the A/C control module itself, it is a key part of a significant issue covered by Honda Technical Service Bulletins (TSBs) for 2017-2018 CR-V models.

TSB 19-032: Software Update with A/C Control Unit Replacement

This is the most critical piece of information for this part. Honda identified an issue where certain 2017-2018 CR-Vs could experience engine driveability problems, setting engine misfire codes (P0300-P0304) or a "fuel system too rich" code (P0172). Honda's official fix involves multiple steps, including replacing the A/C control unit, changing the engine oil, and updating the software for the PGM-FI (engine computer) and TCM (transmission computer).

This TSB is crucial because it confirms that replacing the A/C control unit requires a subsequent software update using a dealer-level tool (the Honda i-HDS). This is not a simple plug-and-play part.

Warranty Extension for A/C Compressor Shaft Seal (TSB A23-040)

Many CR-V owners experience A/C systems that stop blowing cold. The most common cause for this on 2017-2022 models is not the control module, but a leaking A/C compressor shaft seal. This problem is so widespread that Honda extended the warranty on the A/C compressor shaft seal to 10 years with unlimited mileage. If your only symptom is a lack of cold air, investigate this TSB before suspecting the control module.

Buying a Used A/C Automatic Temperature Control Module

Buying a used OEM module can be a great way to save money, but it comes with significant considerations due to the programming requirements.

• Verify Compatibility: First and foremost, ensure your CR-V has automatic temperature control. This system has an "AUTO" button and allows you to set a specific temperature. It is different from the manual system with simple blue-to-red dials. This module will not work in a vehicle with manual A/C.
• Part Numbers: The primary OEM part number is 79600-TLA-A63. This number supersedes older versions 79600-TLA-A61 and 79600-TLA-A62. When buying used, aim for the newest revision (A63) if possible, though any of these numbers are functionally correct for the specified years.
• Physical Inspection: Carefully inspect the used module for any signs of physical damage, especially to the connectors and pins. Check for any discoloration that might indicate water intrusion or electrical shorts.
• The Programming Problem: This is the biggest hurdle. As confirmed by TSB 19-032, replacing the module requires software updates with a Honda i-HDS tool. You cannot simply swap the part and expect it to work correctly. You MUST factor in the cost and logistics of a visit to a Honda dealer or a well-equipped independent shop that has this specific software.
• Why Used OEM is Still a Good Choice: Despite the programming, a used OEM module is often superior to new aftermarket options. Aftermarket modules can have quality control issues and may not integrate as seamlessly with the vehicle's complex communication network (B-CAN system). A genuine Honda part, even used, is designed to meet the original specifications.

Replacement and Programming Procedure

Replacing the module is a straightforward mechanical task, but the final software steps are critical.

1. Access the Module: The A/C control unit is located behind the glove box on the passenger side.
2. Removal: You will need to remove the passenger's dashboard side panel, the undercover, and the glove box assembly to gain access.
3. Installation: Disconnect the electrical connectors from the old unit, unbolt it, and install the new unit in its place. Reconnect the electrical connectors.
4. Reassembly: Install the glove box and trim panels in the reverse order of removal.
5. CRITICAL - Diagnostics and Software Update: This step must be performed by a technician with a Honda i-HDS tool.
   • Connect the i-HDS and run the self-diagnostics procedure to ensure the new module is communicating correctly.
   • Clear any new DTCs that may have appeared during the swap.
   • Update the PGM-FI and TCM software to the latest version, as specified in the TSB.

Cost Comparison

Frequently Asked Questions (FAQ)