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
DTC Strategy
Voltage check
Poor connection in harness
Open or short in signal circuit
Open or short in power circuit
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%
? Defogger sensor according to Class Temp
Temp(?)
Resistance(?)
-40
188.50±4%
20
12.09±1.2%
-20
67.8±3%
40
5.83±1.6%
0
27.28±2%
80
1.67±2.5%