The Auto defogger sensor is installed on front window glass. The Auto defogger sensor judges and sends signal for the occurance of moisture in advance of blowing out the wind for defogging. The 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 signal has been detected short to ground in ground circuit for 2 seconds.
Item
Detecting Condition
DTC Strategy
Voltage check
Open or short in signal circuit.
Open or short in power circuit.
Faulty Auto defogger sensor actuator .
Faulty Air conditioner Control Module.
Enable Conditions
Ignition ON
Threshold value
Short to ground in signal circuit for 2 seconds
Failsafe
Air Conditioner Control Module Controls humidity as 0%
(%RH)
(+Duty)
30±6%RH
30±6%
60±6%RH
60±6%
40±6%RH
40±6%
70±6%RH
70±6%
50±6%RH
50±6%
80±6%RH
80±6%