Have you checked all the doors are fully shut, because if they are not results in the symptoms you have.

This is a VERY common prob on todays cars and this applies to the berlingo too, mine has had a intermittant prob like yours too, sometimes its ok for 6 months, then it has a spate of unlocking by itself even when dead- locked, mine tends to start doing it after a long run, sometimes it can be a stiff lock upsetting the balance. Ive had my berlingo (1.9D 02)into the main dealer about it and they could not find the prob (No charge). Good luck

Edited by barkas on 19/05/2011 at 02:13

Ye Auld Blingo problem...mines been like that for years, it does it for a week, then stops doing it for months before starting off again for another week, been to the main dealers who cant find the problem. mine does it in cities rather than urban, maybe its microwave interference...dunno