You may need to get this info from a car audio shop, which sometimes sells wiring diagrams.
I can help you though with basic wire code identification, so you'll know how to either read or explain the wiring:
Whenever a wire is labeled with two colors; the first color listed is
the basic color of the wire, and the second color is the tracer marking
of the wire. If the second color is followed by by a D, the tracer is
dots. If the second color is followed by an H, the tracer is hash marks.
For example: BR/O is a brown wire with an orange stripe, R/Y D is a red
wire with yellow dots and BK/W H is a black wire with white hash marks.