Have you looked into the Aerpro plug and play harnesses? What brand head unit are you looking to install?
These are straight from the OEM wiring diagrams manual, assuming that you do not have a cd changer.
I/TOCAU, do not take responsibility if you let the smoke out, these are provided as advice only, use at your own risk.
Working right to left, top to bottom on each connector.
Connector A(left):
1. Light Green FR+
2. Pink FL+
3. Blue/Red ACC
4. Red B+
5. Blue FR-
6. Violet FL-
7. Brown EARTH
8. BLANK
9. BLANK
10. BLANK Should be, unless you have a changer. Although I have noticed there is a wire present.
Connector B(right):
1. Red RR+
2. Black RL+
3. White RR-
4. BLANK
5. OCCUPIED BUT NOT PART OF CIRCUIT
6. Yellow RL-