rover 25 central locking?

please help.just bought a rover 25 and central locking does not work the fob only puts alarm on/off,so have to use key and then it only opens drivers door all other doors have to be opened manualy,checked all fuses and have checked the tailgate wring loom which looks like it has had a repair at one point but all wires fine,looks like the have been soldered at one point,the car is a 03 2.0td,dont know where to go from here,any answers welcome i need it fixed and cant afford a auto electrician.thanks