Alarm/immobiliser

[luciann22]

We have converted our 03 belingo into a micro camper however the internal alarm, a continuous screeching noise comes through the speakers every morning when we open the doors!
We have tried using the internal lock button but is still happened. I have also tried starting the engine before we open the doors but as soon as the key went into the ignition it started, when the engine is turned on the noise continues but it isn't as loud, it just causes the radio to stop!
Is there anyway we can disconnect whatever is causing this??

[GiveMeABreak]

There are 2 possibilities I can think of without further information:
1) The alarm siren Module needs replacing - especially if this is a 2003 model and the original - as it would of done nearly 18 years of service if the original and the backup battery may have failed causing random triggering.

2) The other possibility is that some of your 'modifications' have caused a problem - i.e. have you changed, spliced, tapped into / removed any of the wiring harnesses? Have you altered any of the door fittings or fitted an aftermarket radio or changed anything?

PS I've updated your profile to correct 'Citroen' and 'Berlingo'.

[wheeler]

Is this an aftermarket add on alarm?
Cant think I’ve ever seen a mk2 Berlingo with a factory fitted alarm.

[wheeler]

Are you saying the noise is coming through the speakers in the doors that the radio comes through.