Belushi, I think he's talking about the remote turn-on for the factory Sony amp. I think the only issue is that it's 5v and not 12v, meaning it may not work for additional aftermarket equipment.
I believe what people have done is (if using the Sony remote turn-on) is to add a small 12v relay (Radioshack) to give it the necessary power to turn on your auxiliary equipment.
Alternatively, people have tapped the #38 fuse with an add-a-circuit and ran their remote wire off of that. This thread was useful: