Humidity sensor located at heater control unit detects in-car humidity for in-car humidity control. If ambient air temperature or in-car humidity is outside certain range, it will turn on A/C to control in-car humidity for preventing incar fogging. Air conditioner operation depends on ambient temperature and humidity
The ECM sets DTC B1201 if there is a short circuit in humidity sensor signal harness or the measured frequency value of sensor is less than threshold value(about 6,100㎐)
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Frequency check | ● Short circuit in harness ● Fault Humidity Sensor |
Threshold value | ● < 0.1V | |
Detecting time | ● 0.3sec | |
FAIL SAFE | ● Control with the vlaue of 10% |
Relative humidity(%) | Frequency(Hz) | Relative humidity(%) | Frequency(Hz) |
20 | 6950 | 60 | 6540 |
30 | 6855 | 70 | 6410 |
40 | 6750 | 80 | 6275 |
50 | 6645 | 90 | 6100 |
