Finally solved the problem!
Hope this might help all those people out there with intermittent sounding of their car alarm.
Renault Megan Convertible.
Having taken the car back and forth to my Renault dealer and being told that it would now be OK, it still kept intermittently going off after ten minutes when locking the car. Problem never showed up when I took it to the garage, at least the RAC man that came out on a few occasions heard the problem, and just advised me to take back to the garage.
Never had a problem when the roof was down so the garage kept looking for a fault on the interior sensors.
To cut this story short , It turns out to be that when I lock the car and have forgotten to take out my mobile phone (switched on) which I keep in the centre consol. 99% of the time I remember to take it out, thus the reason for the intermittent problem and the phone is always taken out when I take the car to the garage. If the phone is left on the floor or on the seat no problem, only when in the centre console. I also find it only happens when I am using my Blackberry with full data & Bluetooth enabled. It does not do this with my older mobile phone without data & Bluetooth.
Michael
Need to find out if it is factory installed or aftermarket type. If after market installed locate brain which is usually under drivers dash board and simply unplug the main brain. This will kill the alarm till you can have it looked at. Sounds like a pin switch is showing a open contact or the shock sensor is being triggered all to often.. Turn down the sensitive if you can find the adjustment
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