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.

NOTE: Before testing the sensor, check for HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION )

Remove the humidity/in-car temperature sensor (see HUMIDITY/IN-CAR TEMPERATURE SENSOR REPLACEMENT )
Test the humidity/in-car temperature sensor while holding it in front of the dashboard center vent
- Measure the resistance with the system set to Max Cool
- Measure the resistance with the system set to Max Hot
Compare the resistance reading between terminals No 4 and No 3 of the humidity/in-car temperature sensor with the specifications shown in the graph, the resistance should be within the specifications

Fig 1: Humidity/In-Car Temperature Sensor Resistance Graph
Courtesy of AMERICAN HONDA MOTOR CO., INC.
If the resistance is not as specified, replace the humidity/in-car temperature sensor (see HUMIDITY/IN-CAR TEMPERATURE SENSOR REPLACEMENT )
Clear any DTCs set when you disconnected the humidity/in-car temperature sensor

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.

Safety Warning

In-car Temperature Sensor Test

Use the Manual With the Right Hardware

When to See a Mechanic