If you're tapping off the back of the radio this should give you the pinout for the radio itself: http://www.crutchfield.com.edgesuite.../120701817.PDF
I would tend to go aftermarket so you have better control over your sub. An aftermarket head is easy to add and retain the factory amp.
1996 ZJ Green Laredo V8, 2.5" OME and Bilsteins, 33's, Holes drilled in the roof.
1998 ZJ Platinum Limited 5.9, Backyard parts fodder
1987 Mercedes 300D Turbo, the diesel daily, 30mpg in style
Originally Posted by Texas ZJ1
I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.