General Information

Component Location





General Description

Humidity sensor located at heater control unit detects in-car humidity for in-car humidity control. Humidity sensor and in-car sensor are joined as one body. Humidity sensor transforms measured humidity into frequency value and delivers it to A/C Control unit. If ambient air temperature or in-car humidity is in a specified range that can makes frost on the window glass, A/C will be activated to control in-car humidity to prevent frost on the window glass.

DTC Description

The ECM sets DTC B1201 if there is a short circuit in humidity sensor signal harness.

DTC Detecting Condition





Schematic Diagram





Signal Waveform

** Frequency value of humidity sensor as a function of humidity.