[e2helper]

Just hypothetical but............

There are quite a few ignition circuits - closest one is in the rear electrical center on driver side of trunk. However what you would likely want to get the best "power moding" would be the same circuit used on factory system to turn on the amplifier. Since this is fed directly from radio is doesn't much output capability - just can be used as a "logic input".

So that if that sounds like a match then you will find it going up the right side "C" pillar in body harness along with your AM/FM coax cable to the rear antenna amplifier. which is mounted above the rear glass. I think it is a pink wire.

The ignition circuit in rear electrical center is a yellow circuit. I think in black connector cavity F2. It is used for sunroof and heated seat as well.

 

[e2helper]

Even though you have neither of those options the yellow wire will be in rear fuse center. There actually isn't a fuse back there, the power feed starts from the center console fuse you found and passes through the rear electrical center to go to the headliner harness. However in your case the wire stops at that point since no sunroof. That would make it easy to use that wire since it doesn't need to go there.

However the pink wire would be your best choice for following reason: Notice how when you turn the car off that the radio continues to play for up to 10 minutes? Either wire would provide you with that function.

However have you also noticed that if any door other than the driver's opens the radio continues playing? Only the pink wire would give you that functionality. The yellow wire would lose power immediately when ANY door is opened.