what kind of power does the amp need?  just a 12 volt source to turn it on?

If it came with instructions it will explain to you what is needed,
sometimes a jumper has to be cut. if you don't have installation
instructions contact Pioneer

Glenn Beasley
Chrysler Tech

Same problem with an LHS and a Voyager. On the LHS there was one massive
ground wire. Needed to be connected.

On the Voyager (92) there was the massive grounding strap. This turned on
the main amp. But the 'subs' in the doors weren't working. There is
another, smaller black wire (on my Infinity system, you didn't mention,
but since you are talking about subs I assume you are talking about the
INfinity system) the black wire needed to be grounded to the frame of the
radio. It comes with a female blade type connector; if you have one on the
back of the Pioneer, connect it. A good stereo store will have a grounding
clip (it may have come in the bag of parts with the Pioneer) that you can
attach to the back of the Pioneer and provide a male blade connector, or
buy one at the store. Or, cut the clip off, strip the wire and attach it
to the ground wire of the radio.

BTW, I replaced the stock Infinity speakers with aftermarket Infinities,
and put a set of MB Quarts in the dash...WOW! You have to fudge with the
wiring in the hatch to get them to work properly; I think I used the two
inboard connections, IIRC. Now, to get some decent 5x7's or 6x8's for the
front door 'subs'...

You are going to have a problem installing an after market system to work
with your factory amped speakers.     You have 8 speakers to hook up.    In
your manual it says not to use amplified speakers cause it could damage the
unit.  And you have speakers that are sharing a common ground which is a no
no.     You can try hooking it up like I think you have it hooked up, the
fronts and rears, it looks like your only hooking up 4 speakers at the
factory connector but it's actually 8.     Hook up the blue amp wire off
your pioneer to the Dark Green with a Red stripe wire coming out of your
dash.   That will activate the relay for your amplified speakers.   Try it
out, if your getting bad crackling noises or humming when you trun it up
disconnect it or you will fry the stereo.    Your gonna need to replace the
amplified speakers with regular ones and you  might have to run some new
wires.