Radio C1 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12110088 24 Way F Micro-Pack 100 Series (GRY)
Pin	Wire Color	Circuit No.	Function
A1	ORN	1044	Class 2 Serial Data
A2	-	-	Not Used
A3	PPL	493	Rear Seat Audio Enable Signal (w/o U32)
A4-A5	-	-	Not Used
A6	PNK	314	Radio On Signal
A7	DK BLU	1796	Steering Wheel Controls Signal
A8	TAN	201	Left Front Speaker Output (+)
A9	GRY	118	Left Front Speaker Output (-)
A10	LT BLU	115	Right Rear Speaker Output (-)
A11	DK BLU	46	Right Rear Speaker Output (+)
A12	BLK/WHT	351	Ground
B1	ORN	640	Battery Positive Voltage
B2	-	-	Not Used
B3	PPL	493	Rear Seat Audio Enable Signal (with U32)
B4	BRN/WHT	230	Instrument Panel Lamps Dimming Control
B5	BLK/WHT	351	Ground
B6	-	-	Not Used
B7	LT GRN	1011	Remote Radio Control Signal
B8	BRN	199	Left Rear Speaker Output (+)
B9	YEL	116	Left Rear Speaker Output (-)
B10	DK GRN	117	Right Front Speaker Output (-)
B11	LT GRN	200	Right Front Speaker Output (+)
B12	GRY/BLK	308	Step Dim Signal