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 B1200 if there is an open circuit in humidity sensor signal harness or the measured frequency value of sensor is more than threshold value(about 6,950㎐)
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Frequency check | ● Open Circuit in harness ● Fault Humidity Sensor |
Threshold value | ● > 4.9V | |
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 |
