This is pulled from that same DIY regarding the subwoofer install. Specifically, where the guy tapped for a remote turn on lead. I tapped the same wire and mine works just fine.
Quote:
Picture 2 shows the (+12v) remote 'turn-on' source connector where I got the remote on/off +12v. I found the connector (shown on the picture) somewhere under the CD changer. I tested all the wires with a voltmeter and found one which worked with the ignition. Not sure if you will have a similar connector in yours. Use a voltmeter to check which of the wires is a +12v connected to the ignition. To prevent any damage you should always use a voltmeter and ohmmeter to double check all wirings before making the connections.
picture 2
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As far as not needing a remote turn on while using the speaker level input on your amp, I'm not quite sure. Some amps don't require a remote turn on when using speaker level inputs. Some do. The best thing to do is double-check with the tech-line for the brand of amp you have and they can probably tell you for sure if you'll need a remote turn on for your amp or not while using the speaker level input route.