need factory wireing diagram for radio

[redbird94]

i need a factory wiring diagram for the pigtail that goes to the back of the radio in my 1994 firebird formula... anyone have it?

[redbird94]

is this right?

16.Headunit wiring harness (SShevy)
Pin#.................Color...........…….......Func tion
1......................Grey....................... ..Front Left Speaker -
2......................Tan........................ ...Front Left Speaker +
3......................Dark Green.............Front Right Speaker -
4......................Light Green............Front Right Speaker +
5......................Black .................Ground
6......................Brown..................Illu mination
7......................Grey...................Dimm er
8......................Pink...................Powe r Antenna
9......................Yellow.................12V Ignition
10.....................Orange.................12V Constant
11.....................NA.....................NA
12.....................NA.....................NA
13.....................NA.....................NA
14.....................Dark Blue..............Steering Wheel Controls
17.....................Light Blue............ Right Rear Speaker -
18.....................Dark Blue..............Right Rear Speaker +
19.....................Yellow.................Left Rear Speaker -
20.....................Brown..................Left Rear Speaker +

The smaller plug on the back of the radio is for the optional cd changer