Vauxhal zafira 2000 reg central locking fault

Hi all first time on this forum i usually go on the alarm side as i fit alarms
and do diy mechanics good on engines and gearboxes body work ect
but i have just purchased a 2000 reg zafira1.6 petrol for my daughter as the corsa was to small with 3 kids everything works great just fitted a new cam belt and a good service the only problem is the central locking does not work on the 2 rear doors can any body help looking at the scematics for the central locking looks like all the doors are fed from the same relay i might be wrong but maybe someone can help with a bit more knowledge on this thanks BAZ

1st check where the wires go through to the door,they might of fraid/perished.

thanks i will check it tomorrow as it has gone home for now can any body tell me how to test the locking motors if i take them off the car as i will take them off if needed the manual does not tell you how to test them off the car to see if they lock and unlock by connecting then to a battery thanks again BAZ am i right in saying that they all are fed off the same relay or are they individually fed to each door seperatly sorry to be a pain cheers