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 short to ground in ground circuit for 2 seconds.
Item
Detecting Condition
DTC Strategy
Voltage check
Poor connection in harness
Open or short in signal circuit
Open or short in power circuit
Faulty Auto defogger sensor actuator
Faulty Air conditioner Control Module
Enable Conditions
IG KEY ON
Threshold value
Short to ground in signal circuit for 2 seconds
Failsafe
Air Conditioner Control Module Controls humidity as 0%
? Hz of Defogger sensor according to Humidity
(%RH)
(Hz)
0
37.19
60
34.8
20
36.4
80
34
40
35.6
100
33.2