16 · Diagnostics

P10 Door locking device not working

Fault diagnosisP10 Door locking device not working

When the central door locking is operated with the key (or remote control) the doors do not open / close at all.

Step	Test procedure	Result	Action
0	PRELIMINARY CHECKS Check that the battery voltage is over 9 V	OK	Move onto step 1
0		Battery voltage below 9 V: in these conditions the door locks are not supplied by the control unit	Restore the correct battery voltage End of diagnosis
1	CHECK OPERATION OF INDIVIDUAL DOORS Check that, when the door lock/unlock is operated, none of the locks is activated	OK	Move onto step 2
		Fault in one of the front locks	Check and if necessary replace the front door lock motors Op. 7005N21 End of diagnosis
		Fault in one of the rear locks	Check and if necessary replace the rear door lock motors Op. 7010N21 End of diagnosis
		Faulty connection between services control unit and one of the locks	door lock motors Wiring diagram E3040 DOOR LOCKING DEVICE End of diagnosis
2	CENTRAL LOCKING ELECTRICAL CIRCUIT CHECK Check, in order: central locking fuse, located in junction unit connection between junction unit and services unit services control unit supply correct operation of services control unit Wiring diagram E3040 DOOR LOCKING DEVICE	OK	Move onto step 3
		Connections not correct	Restore connections End of diagnosis
		Component defective	Replace the component involved (if a fuse is involved, search for the cause of the problem) End of diagnosis
		Control unit not working	Replace the services control unit Op. 5505A18 End of diagnosis
3	CORRECT OPERATION CHECK Check that the fault is no longer present	OK	End of diagnosis
3		Fault persists	Incorrect selection of diagnostic procedure

Parts & tools for this job Staging For 1997 Alfa Romeo 156

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