Gilligan22uk

Please help, just brought a 2013 superb greenline, issue I got is the back right door, the central locking, window or light does not work like bow power going to it, but speaker works, so I’ve tested the wires loom with a tester to make sure there’s a circuit and that’s all show and inspection what I can see of the wire loom looks fine, I’m not sure if it’s the door module that’s gone, is there a way to test it, does it need to be programmed into the car, then on to the second question, what scanning tool do I need to get to be able to program stuff like this in, really don’t wana have to pay the garage loads of money when I can invest in one my self, I’ve had a look seen loads and to be honest not a clue which one will do the job. So sorry for the newbee questions, just wana get the car working right and not have to spend a load of money on it. Thanks in advance