One of the plugs is for loudspeakers the other is permanant and ignition power supplys to the head unit and outputs sub amp, lighting and the dash remote buttons.
You have the diagrams so is there any thing specific you wish to know as i have just been through my plugs with a test meter so i could fit a newish head unit..
bloody hell thats spooky! i was just signing in so i could post the exact request
someone has cut the block off mine so all iv got is a bunch of wires and no idea of whats what.
im gonna pop out and fit my stereo now cheers