Users are reporting a variation of the ignition switch positions on the pictured diagram that corresponds to these numbers:

LOCK: All Open | ACC: 1 + 5 | ON: 1+3+4+5 | START 1+2+3

Now it's testing time. The key should be placed into the ignition switch and turned to the appropriate position; you should test for continuity between each of the points as outlined in the guide.

I want to mention that this testing should be performed as thoroughly as possible, since the switch may appear to be fine at first. I got lucky in the sense that the switch immediately failed one of the tests. The best way to test the switch is to plug in the multimeter leads into the 1 and 4 terminals, and then to cycle between "On" and "Start." Eventually the multimeter should read "no continuity" in the "On" position, indicating that the switch is bad.