194002084 - A020 ALARM SIREN NOT WORKING

The siren is connected to the Body Computer Node via the A-Bus dialogue line.The siren is operated and controlled by the Body Computer Node by means of a series of coded messages; in the case of a failure the Body Computer node detects and memorizes the causes of the malfunction.The siren is equipped with a battery whose charge is guaranteed in the presence of a +15 supply from the ignition with the alarm system switched off and is managed by the actual siren; the activation/end of charge command is given by the Body Computer

		Results of the tests
1	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the diagnostic equipment ot the diagnostic socket and check for the presence of the siren at the Body Computer Node in the parameters ambient	Move on to Step 2	Siren not present	Check the conformity of the vehicle
2	SIREN ELECTRICAL EQUIPMENT CHECK	All OK	Problems encountered	Operation
	Check that the power supply for the siren is correct and check the continuity and insulation for the A-BUS serial line between the Body Computer Node and the siren.	Move on to Step 3
3	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the Examiner diagnostic equipment to the diagnostic socket and check the following at the Body Computer Node in parameters ambient. the correct activation of the siren. the condition of the A-Bus serial line	Move on to Step 4	The siren is not activated	Replace the siren    Op. 5580E40 ANTI-THEFT DEVICE SIREN - R+R
			Serial line broken	Restore the serial line    See E7015 ALARM
4	CHECK ON CORRECT OPERATION	All OK	Problems encountered	Operation
	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.