After browsing through 40 pages of schematics, the radio system is the very last schematic in the book of course ...
Can't guarantee for the values, better check before connecting especially the suspected power supplies

Also, please note duplicate use of some colors ...
Yellow - Ignition Power
Orange - Battery Power
Steering Wheel Controls - Dark blue
Grey & Tan - left front Speaker
Dark & Light Green - right front Speaker
Brown - Lights On input
Grey - Illumination Input
Dark& Light Blue - right rear Speakers
Yellow & Brown - left rear Speakers
Black - Ground
Source - Haynes Repair Manual, 4th gen 93 through 2000 ...