General Information

Component Location





General Description

The ambient temperature sensor located at the center stay of the condenser detects ambient air temperature. It is joined to AQS sensor as one body. It is a negative type thermistor whose resistance is inversely proportional to temperature. Its output is used for sensor fail-safe, temperature regulation door lock, blower motor level control, mix mode control and in-car humidity control.

DTC Description

The ECM sets DTC B1238 if there is an open circuit in ambient temp sensor signal harness or the measured voltage value of the sensor is more than the threshold value (4.9V)

DTC Detecting Condition





Schematic Diagram





Signal Waveform

** Resistance value of ambient temp. sensor as a function of temperature.