how to troubleshoot HVAC codes B0131 in Toyota Corolla E140 (2006-2013)

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, basic hand tools (screwdrivers, socket set)
• Ensure the vehicle is parked on a level surface and the engine is off before starting repairs.

2. Remove the HVAC Control Module

• Disconnect the negative battery terminal to prevent electrical shorts.
• Remove any trim panels or covers that obstruct access to the HVAC control module.
• Unplug the connectors from the HVAC control module and remove the mounting screws.
• Carefully take out the HVAC control module.

3. Replace the Temperature Sensor

• Locate the temperature sensor, usually positioned near the evaporator core or on the HVAC housing.
• Disconnect the wiring harness from the temperature sensor.
• Remove the old temperature sensor by unscrewing it from its mounting location.
• Install the new temperature sensor, ensuring it is seated properly and secure.
• Reconnect the wiring harness to the new sensor.

4. Reinstall the HVAC Control Module

• Position the HVAC control module back into its place and secure it with mounting screws.
• Reconnect the connectors to the HVAC control module.
• Replace any trim panels or covers that were removed during the process.

5. Final Checks

• Reconnect the negative battery terminal.
• Start the engine and allow the HVAC system to operate for a few minutes. Observe for proper functioning.