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Those wiring diagrams look like the ones I used to find the injector wire in my Scion xA, your Matrix's little sibling. Do you also have a PDF that lists connector locations? If you can send both of those to me, I got pretty good at reading them and can tell you exactly what wire to cut at what location to cutoff your injectors.
Regarding the relay - does it have 5 connections? I would not use a normally-open relay just because if it fails it will fail in a way that leaves you stranded. What you want to do is interrupt the power side of the injectors (not the ECU side, which gets grounded to shoot gas). Since you're tying into an always-hot line, you can also use that as your power feed for the relay. Then all you have to do is ground the other end of the relay coil and you open the relay.
(Wandered away from my first question there - a 5-prong relay normally has two lines for the coil (nonpolarized), a common connection, and an NC and NO plug).
Look at my other posts and you will see the mod I did for my xA.
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