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Not all alarms work through vibration - many work via a voltage drop. Leave a window open and after the alarm has set shove you hand inside wave it around and see what happens. It is also probable there is a contact button under the bonnet lid which you can tape down - set the alarm and then undo the tape.
By the way not all Renaults come fitted with an alarm and in many cases is an optional extra
Currently in madnoel10's garage:
Honda Civic 1.4l