There are a total of 16 relays in the IPDM, there you can see the 8 serviceable ones. The fuel pump relay is one of the 8 internal, non serviceable relays in the IPDM.
Although a different ar, the Versa has the same engine and this thread shows this:
[URL unfurl="true"]https://www.nissanversaforums.com/threads/fuel-pump-fuel-pump-relay-fuel-pressure-regulator-ipdm-trouble-shooting.4321/[/URL]
In my case however the fuel pump is fine and the harness is also fine, it is the fuel pump relay that has gone and I need a new IPDM (Not keen on having it opened up and soldered, I am keeping the car long term so no point in bodging)