F360 Wiring Diagram Query (Windscreen Washer Circuit)

Hi folks,
I'm trying to follow the circuit for the windscreen washer and the power source is not clear. I've traced it to a relay behind the passenger seat, but there is no wiring link shown on pin 30 (usually used for power input).

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Is there a way of finding the power source (I don't have access to the car). The source may be the windscreen wiper fuse, but that's behind the driver's seat.

Thanks
Cheers