General Information

Air Conditioner
B1238 Ambient Temperature Sensor Open (High) - General Information

Component Location





General Description

The ambient temperature sensor located at the center stay of the condensor detects ambient air temperature. 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

Air conditioner Control Module sets DTC B1238 if Ambient sensor has been detected over 4.9V for 4 seconds.

DTC Detecting Condition





Specification

** Resistance value of incar temp sensor as a function of temperature.±3%






Diagnostic Circuit Diagram