I'm getting ready to install an amplifier for the front doors next weekend, and I'm thinking of putting it right underneath the center dash, on the hump. I'd like to know the pinout for all the wires on the factory GM harness, but if not, the most important ones to me are those for speaker output and power antenna turn-on.
Here are pics of the head unit (click on the images for higher resolution)
If you could describe the pinout in whatever format is convenient for you, I'd really appreciate it. Thanks a lot!