While you wait for answers, we may have found some information which could help you.
Click here for Citroen Dispatch ReplacedBattery drain (or alternator or electrics?) on Citroen Berlingo 2008?
Citroen Berlingo 1.6 hdi will not start with key?
Engine smoking?
Wiring to relay between fuse and starter motor?
How can I fix my central locking?
Citroen dispatch rear door lock issue?