J33 AUTOMATIC DEMISTING NOT WORKING - Alfa - 147 - eLearn

3022644 - J33 AUTOMATIC DEMISTING NOT WORKING

With the climate control system on, the automatic demister does not work (In systems where there is the 'automatic demister' function with the windscreen misted up and the climate control system on automatic operation, the control unit acts by increasing the fan speed - orientating the air distribution to the windscreen and sides)

1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
		Results of the tests
	Connect the equipment (Examiner or Examiner plus) to the diagnostic socket and check: that there are no errors in the climate control system control unit	Continue to Step 2	There are faults in the control unit	Continue according to the instructions for the diagnostic equipment
2	CHECK ON SENSOR SUPPLY	All OK	Problems met	Operation
	Check, in order: sensor supply fuse sensor earth and supply connection between sensor and climate control unit See E6020 AIR CONDITIONING	Continue to Step 3	Fuse blown	Replace the fuse and search for the cause of the short circuit
			No sensor earth/supply	Restore the correct connections
			Connection broken	Restore the correct connections
3	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists	Replace the climate control system control unit Op. 5040D15 Search for the fault starting from another symptom'