Hi, my backdoor will not lock when I press central locking. It makes a sound when the central locking is pressed. But it's just not locking. What could the problem be?

When i close the car from keyremote don't close all the doors or open all
It open and close only on the left side
I block manualy the right doors

I cannot open bonnet without power, has a flat battery and I can't open the door to be able to release bonnet catch.