If the relay and wiring do not have them overheated or burned, I tell you how I solutions. I also put a lighter cable directly to the pump (avoiding the relay and its own wiring) to throw but obviously heated. I measured the pump to fuse f35 side and there was continuity but on the other side of the fuse there was therefore the problem was between the relay and the fuse connector. I reread it and try and was OK
pins 1.2 and 9 united and between them and PIN7 is one of the coils, but they only measure in one way because they internally carry a diode, the other coil is between 3,11 (united) pins and 1,2,9. The contacts close the pins 4,5,6,12,13,14 together with each other with the 8,15 (United) pins.
Disassembling the relay seems to be defective the connector since it seems to have sunk pins but removing the plastic protector, it can be seen that there are no cable, 3,6,12,13,14 and 15.
The contact that occupies us has current in pin 8 and must close with pins 4 and 5 that gives the pump current before the fuse. The failure in my case was in the white wire (pin 4) of the connector that did not reach the f35 fuse, I made a splicing with a cable between them and started the first, removing him still without starting, therefore assured me that this was the problem since he was previously very intermittent and could throw months without failing.
I hope I helped someone.