Alarm ringing without a reason
- Make
- Fiat
- Model
- Croma Factory Service Manual
- Year
- 2005–2010
- Section
- Alarm › Alarm 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 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.
| Results of the tests | ||||
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
|---|---|---|---|---|
| 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 | |
| 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. 7040E51 FRONT MODULAR COURTESY LIGHT ASSEMBLY - R R FOR VERSIONS WITH SUN-ROOF | |
| 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 | 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 | Move on to Step 5 | Fault at A-BUS serial line | Repair the A-BUS serial line | |
| 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 | End of diagnosis | Siren power supply not correct | Restore the power supply | |
| Vehicle battery run down (voltage below 3 Volt) | Recharge the battery | |||
| Body Computer defective | Replace Body Computer | |||
Parts & tools for this job For 2005 Fiat Croma
- TOOLTorque wrenchSearch: 3/8 inch torque wrench
- TOOLSocket setSearch: socket set metric
- BOOKHaynes manualSearch: Haynes manual Fiat Croma
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