the vehicle thinks one or more doors are not ckosed properly. Check all five doors plus the bonnet, though I dont think the Berlingo worries about that.
This may or may not be relevant but looks useful:
http://www.citroenownersclub.co.uk/bsi-reset.html
http://www.justanswer.com/uk-car/4olpq-citroen-berlingo-reg-central-locking-tailgate-door-open.html
http://service.citroen.com/dtt/IFD/AC/documents/en_GB/AIDE/2050/PDF/infodiag159.pdf
xxx
February 2017