Join Date: Oct 2005
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Been there and had the sleepless nights with alarm going off randomly at night!
First time the garage added a little "condom" to the bonnet switch which is [evidently] a common remedy for the Scenic - the bonnet cools at a different rate to the bodywork and then the slight movement triggers the alarm. As it is dependent on the air temperature it tends to happen at night. 11PM - 2PM for me.
Second fix was to "swap the wires in the ultrasonic alarms in the panel at the rear of the car" so far this appears to have worked.
The other dealer hint was to ensure that all air vents are closed as this has been known to trigger the interior alarm.
Currently in Paulus's garage:
2004 Espace 2.2 DCi