Rear wiper motor and washer relay.

Hi, does anyone know what under dashboard relays control the wash wipe system. I have fitted a new rear wiper motor but there is no power to the plug. I've checked the fuses in the cabin fusebox and all are fine, so I am assuming that one of the relays under the dashboard control the circuits for the motor and the washer. Strangely, the front wiper works but with no washer function. This will be because the washer pump is dual supply to the front and rear. Any advice would be greatly appreciated as the Haynes manual doesn't provide enough detail on the subject.

With kindest regards

Robert L Newton.