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Fiat Bravo Factory Service Manual (2007-2014)22 · Fault diagnosis
22 · Diagnostics

Alarm ringing without a reason

Make
Fiat
Model
Bravo Factory Service Manual
Year
2007–2014
Section
Alarm › Alarm ringing without a reason
Fault diagnosisAlarm ringing without a reason

ALARM RINGING WITHOUT A REASON

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 turn the key to the MAR position

The system can therefore recognize the transponder and be authorised to deactivate the alarm system

TEST RESULTS
1CHECK USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION

Connect the Examiner equipment to the diagnostic socket and check at the body computer node in the alarm memory for:

· Possible presence of errors

Move on to Step 2

1. Volumetric protection activated

2. Anti-tilt protection activated

3. Presence of errors

1. Move on to Step 2

2. Move on to Step 3

3. Proceed as instructed by the diagnostic equipment

2VOLUMETRIC PROTECTION CHECKALL OKPROBLEMS ENCOUNTEREDACTION

Check that no insect has entered the passenger compartment that could have moved around to set off the alarm or any moving object that may have been detected by the ultrasound sensors.

Check that the vehicle windows are properly shut, especially if there are strong winds.

Move on to Step 3

1. Insect in the passenger compartment that is detected by the ultrasound sensors when it moves around.

2. Vehicle windows open when there are strong winds.

1. Remove the cause of the alarm activation.

2. Close the car windows.

3ANTI-LIFTING/ULTRASOUND PROTECTION CHECKALL OKPROBLEMS ENCOUNTEREDACTION

Connect the Examiner diagnostic equipment to the diagnostic socket and check body computer node in active diagnosis mode to ensure that the ultrasound and anti-tilt sensors are working properly.

Connect the Examiner diagnostic equipment to the diagnostic socket and check body computer node in active diagnosis mode to ensure that the ultrasound sensors are working properly.

Move on to Step 4

1. Anti-tilt sensor faulty

2. Ultrasound waves faulty.

1. Replace the anti-tilt and ultrasound sensors module.

2. Replace the anti-tilt and ultrasound sensors module.

4PERIPHERAL PROTECTION CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Connect the Examiner 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, check that there are no problems when the doors are closedMove on to Step 5Peripheral microswitch faulty.Replace the faulty lock.
5CHECK USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION

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 Test 5580EB SIREN OPERATION CHECK

Move on to Step 6Fault at A-BUS serial line

Repair the correct A-BUS serial line

See E7015 ALARM

6SIREN POWER SUPPLY CHECKALL OKPROBLEMS ENCOUNTEREDACTION

Check that the siren power supply is correct and check the condition of the connections

See Test 5580EB SIREN OPERATION CHECK

End of diagnosis

1. Power supply for the siren not correct due to a drop in voltage in the wiring.

2. Vehicle battery run down (voltage below 8 Volt)

3. Body computer defective

1. Restore the correct power supply

See E7015 ALARM

2. Recharge the battery

3. Replace body computer

Op. 5505A35 MAIN BODY COMPUTER/JUNCTION UNIT - R.R.

Parts & tools for this job For 2007 Fiat Bravo

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