23 · Diagnostics

Alarm ringing without a reason

Make: Alfa Romeo
Model: 159 Factory Service Manual
Year: 2005–2011
Section: Alarm › Alarm ringing without a reason

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Fault diagnosisAlarm ringing without a reason

ALARM RINGING WITHOUT A REASON

1.9 JTS, 2.2 JTS, 3.2 JTS, 1.9 JTD 8V, 1.9 JTD 16V, 2.4 JTD 20V

With the alarm on the alarm cycles are set off without any apparent cause and without any attempts to break into the vehicle.

If it is not possible to stop the siren and deactivate the alarm using the remote control, simply activate the instrument panel by inserting the key in the key recognition device. The system can recognize the transponder and switch off the alarm system in this way.

0	PRELIMINARY CHECKS	All OK	Problems encountered	Operation
		Results of the tests
	Check that there is not actually any instrusion in the passenger compartment like an insect that could set off the alarm by moving around or any moving object that could be detected by the ultrasound sensors. Check that the windows are properly shut, especially if there are strong winds.	Move on to Step 1	Insect in the passenger compartment that is detected by the ultrasound sensors when it moves around	Remove the cause of the alarm
		Move on to Step 1	Vehicle windows open when there are strong winds	Close the windows
1	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the Examiner equipment to the diagnostic socket and check at the Body Computer Node for the presence of any errors in the alarm memory	Move on to Step 2	Presence of errors	Proceed as instructed by the diagnostic tester
2	ANTI-LIFTING/ULTRASOUND PROTECTION CHECK	All OK	Problems encountered	Operation
	Connect the diagnostic equipment to the diagnostic socket and check at the Body Computer Node in active diagnosis that the anti-lift/ultrasound sensors are working properly	Move on to Step 3	Anti-lift/ultrasound sensor faulty	Replace the courtesy light module with built-in sensor Op. 5580E50 ANTITHEFT DEVICE VOLUMETRIC SENSOR R R FOLLOWING ELECTRICAL CIRCUIT CHECK
3	PERIPHERAL PROTECTION CHECK	All OK	Problems encountered	Operation
	Connect the diagnostic equipment to the diagnostic socket and check at the Body Computer Node that the microswitches for the doors, bonnet and boot are working properly. In particular that there are not problems with the doors closed See Test 70C CHECK ON DOOR LOCK MICROSWITCHES	Move on to Step 4
4	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the Examiner diagnostic equipment to the diagnostic socket and check the condition of the A-Bus serial line between the Body Computer Node and the siren at the Body Computer Node in active diagnosis See E7015 ALARM	Move on to Step 5	Fault at A-BUS serial line	Repair the A-BUS serial line See E7015 ALARM
5	SIREN POWER SUPPLY CHECK	All OK	Problems encountered	Operation
	Check that the siren power supply is correct and check the condition of the connections See E7015 ALARM	End of diagnosis	Siren power supply not correct	Restore the power supply See E7015 ALARM
			Vehicle battery run down (voltage below 3 Volt)	Recharge the battery
			Body Computer defective	Replace Body Computer Op. 5505A32 BODY COMPUTER - R.R

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Parts & tools for this job Staging For 2005 Alfa Romeo 159

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