As a suggestion I would go to the pump in the boot area then remove both salmon coloured relays then reseat them, put them back in.
Really you need a digital volt meter with the drawings for the actual circuit. If there is no lights on the open switch it could be the actual switch not providing an input. However if you push the roof switch and it drops the windows then opens the boot you know the pump is working but it’s missing the next step! Likely to be a proximity switch. Best of luck. I would search for drawings on here (electrical)