While you wait for answers, we may have found some information which could help you.
Click here for Electrical Problem Thinkhave you got torque settings for berlingo 1999 1.8 petrol?
Citreon berlingo 1.9 diesal ?
Wiring to relay between fuse and starter motor?
Citroen dispatch rear door lock issue?
Battery drain (or alternator or electrics?) on Citroen Berlingo 2008?
central door locking on Citroen Dispatch van not working properly?