berlingo central locking?

hi according to the haynes book and the glovebox book my bingo has deadlocks/double locks on the doors although the plip isent working the citroen book says holding the key in lock position for av few seconds should set the deadlocks . sofar squat bo didley. have tried to find locking controle box . no joy the haynes book says its IN the SILL one citroen dealer says its built into the B S I computer, another says it hasent got B S I, at all. am loosing the will ti live now **£$% computers, anyone any advise cheers lee.