2002 Tahoe factory radio

[italianstln 10+ year member]

Does anybody know how/where I can get a wiring diagram for a 2002 Tahoe factory radio deck, or if anybody has had any experience with this particular car. I'm trying to hook up an amplifier and a pair of subs, but the radio only has speaker level outputs, and I can't figure out which wire is the 'blue turn-on wire' for the amp because there are two blue wires.

p.s.- the only hook-ups on the back of the stereo are an 18 pin, and a 21 pin connector.

p.p.s.- i know getting a new deck would be quite a bit easier, but i want to stick with the factory deck.

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