22 · Diagnostics

Alarm siren not working

Make: Fiat
Model: Bravo Factory Service Manual
Year: 2007–2014
Section: Alarm › Alarm siren not working

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Fault diagnosisAlarm siren not working

ALARM SIREN NOT WORKING

The alarm siren is connected to the body computer node through the serial line. The siren is operated and controlled by the body computer by means of a series of coded messages; in the event of a failure the body computer node detects and memorizes the causes of the malfunction.

1	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
		TEST RESULTS
	Connect the Examiner diagnostic equipment to the diagnostic socket and check the following at the body computer node in parameters mode: · the presence of the siren In errors mode: · that there are no faults with the siren · that there are no faults with the A-BUS	Move on to Step 2	1. Siren not present 2. Siren faulty 3. Fault at A-BUS.	1. Check the conformity of the vehicle 2. Move on to Step 2 3. Move on to Step 3
2	SIREN ELECTRICAL EQUIPMENT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the siren power supply is correct See Test 5580EB SIREN OPERATION CHECK	Move on to Step 3	Fault with electrical equipment	Restore the correct electrical connection See E7015 ALARM
3	SERIAL LINE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the continuity and the insulation of the A-BUS serial line between the body computer node and the alarm control unit See Test 5580EB SIREN OPERATION CHECK	Move on to Step 4	Fault at A-BUS line	Restore the correct electrical connection See E7015 ALARM
4	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the Examiner diagnostic equipment to the diagnostic socket and check the following at the body computer node in parameters mode · the correct activation of the siren · the condition of the A-Bus serial line	Move on to Step 5	1. The siren is not activated 2. Serial line interrupted 3. Alarm control unit defective	1. Replace the siren Op. 5580E40 ANTI-THEFT DEVICE SIREN - R+R 2. Restore the correct serial line. 3. Replace the alarm control unit
5	CORRECT OPERATION CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present	End of diagnosis	The fault persists	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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