22 · Diagnostics

Central locking not working

Make: Fiat
Model: Bravo Factory Service Manual
Year: 2007–2014
Section: Doors › Central locking not working

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Fault diagnosisCentral locking not working

CENTRAL LOCKING NOT WORKING

When the central locking is activated using the mechanical key or from the inside using the button in the control panel in the dashboard, the central locking system does not work.

The door opening/closing command reaches the body computer node which notifies the door management control unit which, in turn, controls the actuators which close/open the side doors.

1	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
		TEST RESULTS
	Connect the Examiner diagnostic equipment and carry out the active diagnosis for the defective door lock.	End of diagnosis	The door does not close/open.	Move on to Step 2
2	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Keeping the Examiner diagnostic equipment connected, check: - that there are no inactive control units; - that there are no faulty control units;	Move on to Step 3	Presence of faults.	Continue following the instructions for the diagnostic equipment.
3	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Using the Examiner diagnostic equipment, check that the learning of the change of state for the door opening/closing switch is correct.	Move on to Step 5	The signal for the door opening/closing switch status has not been learnt correctly.	Move on to Step 4
4	ELECTRICAL CIRCUIT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	- Check the continuity/insulation of the electrical connection between the defective door lock and the Body Computer - Check the continuity/insulation of the electrical connection between the defective door lock and the door management control unit - Check the continuity/insulation of the electrical connection between the body computer and the locking/unlocking button in the dashboard control panel See E3040 CENTRAL LOCKING	Move on to Step 6	1. Electrical connection between lock and body computer broken or not insulated 2. Electrical connection between lock and door management control unit broken or not insulated 3. Electrical connection between door locking/unlocking button and body computer broken or not insulated	1. Restore the electrical connection See E3040 CENTRAL LOCKING 2. Restore the electrical connection See E3040 CENTRAL LOCKING 3. Restore the electrical connection See E3040 CENTRAL LOCKING
5	CHECK ON CORRECT OPERATION OF LOCK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the defective lock is working properly	End of diagnosis	Lock defective	Replace of defective door lock
6	CHECK ON CORRECT OPERATION OF DOOR MANAGEMENT CONTROL UNIT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present	Move on to Step 7	Door control unit defective	Replace door control unit Op. 7005N40 CENTRAL LOCKING ELECTRICAL CONTROL UNIT - R R FOLOWING SYSTEM CHECK
7	CORRECT OPERATION CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present	End of diagnosis.	Body Computer defective	Replace body computer Op. 5505A35 MAIN BODY COMPUTER/JUNCTION UNIT - R.R.

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Parts & tools for this job For 2007 Fiat Bravo

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