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.
2015 Acura TLX Base, 2.4L EngFACTORY OEM SERVICE PROCEDURE
HVAC System - Testing & Troubleshooting
- Check
- DTC Troubleshooting Index
- General Information
- Component Location Index
- How To Information
- How To Troubleshoot The Climate Control System (2015-17)
- How to Check for DTCs with the HDS
- How to Use the Self-Diagnostic Function with the HDS
- Button/Icon
- How to Use the Self-Diagnostic Function without the HDS
- How to Check for History DTCs
- How to Clear History DTCs
- Checking for 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 (2018-19)
- How to Check for DTCs with the HDS
- How to Use the Self-Diagnostic Function with the HDS
- Button/Icon
- How to Use the Self-Diagnostic Function without the HDS
- How to Check for History DTCs
- How to Clear History DTCs
- Checking for 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 (2015-17)
- A/C System Description
- Climate Control System Description
- Rear Window Defogger System Description
- Testing
- A/C Compressor Variable Capacity Control Solenoid Test
- A/C Diagnostic Process
- A/C System Test
- Blower Power Transistor Test
- Climate Control Switch Test
- Driver's Air Mix Control Motor Test
- Mode Control Motor Test
- Passenger's Air Mix Control Motor Test
- Rear Window Defogger Function Test
- Recirculation Control Motor Test
- Inspection/Adjustment
- Connector For Inputs And Outputs
- Climate Control Unit Connector For Inputs And Outputs (With Auto Idle Stop System) (2015-17)
- Climate Control Unit Connector For Inputs And Outputs (With Auto Idle Stop System) (2018-19)
- Climate Control Unit Connector For Inputs And Outputs (Without Auto Idle Stop System) (2015-17)
- Climate Control Unit Connector For Inputs And Outputs (Without Auto Idle Stop System) (2018-19)
- Disassembly And Reassembly
- Circuit Diagram
- Climate Control System Circuit Diagram (L4) (2015-17)
- Climate Control System Circuit Diagram (L4) (2018-19)
- Climate Control System Circuit Diagram (V6, With Auto Idle Stop System) (2018-19)
- Climate Control System Circuit Diagram (V6, Without Auto Idle Stop System) (2015-17)
- Climate Control System Circuit Diagram (V6, Without Auto Idle Stop System) (2018-19)
- Climate Control System Circuit Diagram (With Auto Idle Stop System) (2015-17)
- Rear Window Defogger Circuit Diagram (2015-17)
- Rear Window Defogger Circuit Diagram (2018-19)
- Troubleshooting
- Symptom Troubleshooting
- Climate Control System Symptom Troubleshooting Index
- 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 Cycles Rapidly On And Off
- 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
- 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)
Factory Service Tools
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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.
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