The pin-out is towards the end of the SVX wiring diagrams.
Take a look at Phatweasel's how-to doc, "After Market Alarm Set-up" posted here:
http://www.subaru-svx.net/photos/user.php?How-To|19764
A few notes:
Quote:
pin 3 "Security" pushbutton on dash - the other side is tied to ground in the dash (unless you hack the switch module in the instrument panel)
pin 10 goes straight to the parking lights. It draws 5.5 A (high current!). You'll need a relay if your alarm brain can't supply +12V at that current level.
pin 13 goes to the car's starter kill relay
pin 17 is a NC (the OEM module's antenna is a wire that hangs out the side)
pin 2 driver's door - you'll see this go to ground when the door opens. This pin can also be used to trigger the dome light (by having your alarm module pulse this pin to ground).
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The OEM harness doesn't include any of the pins you'll need for remote start, but probably everything you need for normal keyless entry and alarm functions.