J20 REARSCREEN AND DOOR MIRROR DEFROSTING NOT WORKING - Alfa - 147 - eLearn

3022640 - J20 REARSCREEN AND DOOR MIRROR DEFROSTING NOT WORKING

With the ignition on, when the heated rear window button is pressed, neither the rear window nor the door mirrors warm up properly

1	CHECKING FUSES	All OK	Problems met	Operation
		Results of the tests
	Check the specific heated rear window and rearview mirror supply fuses on the underfacia junction unit	Continue to Step 2	Blown fuses	Before changing the part, seek the cause of the problem
2	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect the equipment (Examiner or Examiner plus) to the diagnostic socket and check: that there are no errors in the climate control unit that the heated rear window switch changes over to the parameters environment	Continue to Step 3	There are faults in the control unit.	Continue according to the instructions for the diagnostic equipment.
		Continue to Step 3	When the heated rear window switch is operated, the displayed status (ON-OFF) does not change	Replace the climate control unit Op. 5040D15
3	CHECKING HEATED REAR WINDOW AND MIRROR POWER SUPPLY	All OK	Problems met	Operation
	Operating the heated rear window switch, check: correct supply to the heated rear window and rear view mirrors See E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING	Continue to Step 4	Power supply is correct	Continue to Step 4
		Continue to Step 4	Power supply not coming through	Continue to Step 5
4	CHECKING DEMISTING COIL	All OK	Problems met	Operation
	Check: the continuity of the rear window and rear view mirror heating elements earth connections See E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING	Continue to Step 7	Rear window heating element broken	Replace the rearscreen Op. 7035B14
			Mirror heating element broken	Replace the mirror(s) Op. 7005R30
			Earth connections not correct	Restore connections See E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING
5	CHECK ON HEATED REAR WINDOW	All OK	Problems met	Operation
	Verify: operation of heated rear window heated rear window's specific earth (+ / -) and supply See E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING	Continue to Step 7	Heated rear window fault	Replace heated rear window
			Heated rear window supply failure	Restore connections See E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING
			Heated rear window earth failure	Continue to Step 6
6	CHECK ON UNDERFACIA JUNCTION UNIT	All OK	Problems met	Operation
	Verify: Continuity of internal connections of heated rear window control circuit. See E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING	Continue to Step 7	Underfacia junction unit fault	Replace underfacia junction unit Op. 5505A10
7	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists	Replace the Body Computer Op. 5505A32 Search for the fault starting from another symptom'