Hello All. I've had a UK 2.8 CRD diesel since 2010. Recently, about 1 to 3 minutes after locking the car using the key remote the alarm will sound. I can easily switch it off by unlocking the car, again using the key remote. There are no open door warnings on the dash and I've checked the hood/bonnet switch. All seem ok as are all other functions of the car. There are the interior ultrasonic detectors at the front and rear of the car, but I've not found any mention of these in any wiring diagram for the alarm. I also guess that the alarm has a voltage change detection system, but again I can find no information about this. Has anyone come across this problem before or can anyone suggest where to look? At the moment I'm locking the side doors manually and the alarm is not armed. But is there a way of manually locking the tailgate? Thanks for any advice.