Auto defogger sensor is installed on front window glass. Auto defogger sensor judges and sends signal for the occurance of moisture in advance of blowing out the wind for defogging. Air conditioner control module receives signal from auto defogger and performs restraining moisture and eliminating in advance with automatically controlling Intake actuator, A/C, Defogger actuator, Blower motor rpm, Mode actuator.
The Air conditioner Control Module sets DTC B1281 if The signal from auto defogger sensor has been detected Communication Fail or Short to ground or Short to Battery in ground circuit.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Voltage check | 1. Poor connection in harness 2. Open or short in signal circuit 3. Open or short in power circuit 4. Faulty Air conditioner Control Module |
Enable Conditions |
•
IG KEY ON | |
Threshold value |
•
Communication Fail
•
Humidity or Clock signal is below 0.1V
•
Humidity or Clock signal is above 4.9V | |
Failsafe |
•
Air Conditioner Control Module Controls humidity as 0% |
※ Hz of Defogger sensor according to Humidity
(%RH) | (Hz) | (%RH) | (Hz) |
0 | 37.19 | 60 | 34.8 |
20 | 36.4 | 80 | 34 |
40 | 35.6 | 100 | 33.2 |
