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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heating / Air Conditioning System (Except HV, W/ Auto A/C) - Diagnostic Codes (1 Of 2) >> AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System) >> DTC B1411: Room Temperature Sensor Circuit [12/2019 - 11/2023] >> Description

DTC B1411: Room Temperature Sensor Circuit [12/2019 - 11/2023]: Description

The room temp. sensor (cooler thermistor) is installed in the instrument panel to detect the cabin temperature, which is used to control the air conditioning system. The resistance of the room temp. sensor (cooler thermistor) changes in accordance with the cabin temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The air conditioning amplifier assembly applies voltage (5 V) to the room temp. sensor (cooler thermistor) and reads voltage changes due to changes in the resistance of the room temp. sensor (cooler thermistor).

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B1411 Room Temperature Sensor Circuit Open or short in room temperature sensor circuit
  • Room temp. sensor (cooler thermistor)
  • Harness or connector
  • Air conditioning amplifier assembly
 Memorized
(4 sec. or more)*

*: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.

HINT: 

If the cabin temperature is approximately -18.6°C (-1.48°F) or lower, DTC B1411 may be stored even though the system is normal.

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