I have a '93 Astra California and I cannot unlock the passenger doors following a flat battery. Battery now charged but still will not deactivate deadlocks. I have managed to access the drivers door and can see the mechanism which all looks ok(cam on the door lock intact, microswitch seems ok). I have also managed to get the rear passenger door card off and can see the deadlock mech. Can anyone tell me how to release the deadlock? many thanks.