no central locking

Here we go iv got no remote central locking, oncluding the boot

it will not lock with the dvrs door key lock how ever it will lock just the front doors with the lock switch in the middle of the car.

iv tryed both keys, the only other problem is the dvrs window control will not open the pass window, both windows work ,the mirrors work, the door lights work

any 1 got any ideas, i thought it might be the control unit in the dvs door.