16 · Diagnostics

M01 Front window winder not working

Make: Alfa Romeo
Model: 156 Factory Service Manual
Year: 1997–2002
Section: Window winders › M01 Front window winder not working

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Fault diagnosisM01 Front window winder not working

M01 Front window winder not working

With the ignition key in the ON position, when the buttons on the doors are operated, the electric front windows do not work at all

Step	Test procedure	Result	Action
0	PRELIMINARY CHECKS Check that there are no obstacles preventing the travel of the window Check that the electric windows fail to work in all conditions (manual and/or automatic operation)	OK	Move onto step 1
		Presence of obstacles	Restore the correct mechanical operation of the window - up/down End of diagnosis
		The electric window operate manually (the window goes up/down with the button pressed), but not automatically	Move onto step (see M02)
1	ELECTRIC WINDOW SWITCHES CHECK Check the operation of the electric front window switched	OK	Move onto step 2
1		Switch faulty	Replace the electric window switch Op. 7005M10 End of diagnosis
2	ELECTRIC WINDOWS ELECTRICAL CIRCUIT CHECK Check, in order: electric windows fuse switches supply and earth services control unit supply connection between services control unit and switched connection between services control unit and electric windows motors. (Wiring diagram E3050 FRONT WINDOW MECHANISM ).	OK	Move onto step 3
		Component defective	Replace the component involved (if a fuse is involved, search for the cause of the problem) End of diagnosis
		Connections not correct	Restore the connections End of diagnosis
3	SERVICES CONTROL UNIT CHECK Check that the services control unit is working properly, in particular the electric front windows control function see DESCRIPTION AND OPERATION: 5505 Instrument/guage electrical wiring (see 5505F)	OK	Move onto step 4
3		Control unit not working	Replace the services control unit Op. 5505A18 End of diagnosis
4	ELECTRIC WINDOW MOTORS CHECK Check the operation of the electric window motors	OK	Move onto step 5
4		Electric window motor faulty	Replace the electric window motor Op. 7005M21 End of diagnosis
5	ELECTRIC WINDOWS DEVICE CHECK Check the operation of the mechanical part of the electric windows control device and that it is correctly fixed	OK	Move onto step 6
		Electric window device not correctly fixed or adjusted	Restore the operation of the electric window device Op. 7005M25 End of diagnosis
		Electric window device faulty	Replace the electric window device Op. 7005M21 End of diagnosis
6	CHECK CORRECT OPERATION Check that the fault is no longer present	OK	End of diagnosis
6		Fault persists	Incorrect selection of diagnostic procedure

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Parts & tools for this job For 1997 Alfa Romeo 156

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