While you wait for answers, we may have found some information which could help you.
Click here for Start Van BatteryBattery drain (or alternator or electrics?) on Citroen Berlingo 2008?
Wiring to relay between fuse and starter motor?
Citroen Berlingo 1.6 hdi will not start with key?
central door locking on Citroen Dispatch van not working properly?
How can I fix my central locking?
Servo ?