Pontiac (2008-2010) G8 Head Unit pinout signals @ PinoutGuide.com

at the head unit

p/n 92228624, 92245981 ?

Pin	Wire Color	Function
1	L-BU	Right Rear Speaker Output (-)
2	D-GN	Right Front Speaker Output (-)
3	GY	Left Front Speaker Output (-)
4	YE/RD	Left Rear Speaker Output (-)
5	D-BU	Right Rear Speaker Output (+)
6	L-GN	Right Front Speaker Output (+)
7	BN	Left Front Speaker Output (+)
8	BN	Left Rear Speaker Output (+)
9	L-BU	Front Center Speaker Output (+) (UWP)
10	OG/BU	Battery Positive Voltage
12	BK	Ground
13	OG	Front Center Speaker Output (+) (UWP)
14	OG/BU	Battery Positive Voltage
15	OG/BU	Battery Positive Voltage
16	BK	Ground

wiring harness connector (connector end view)

|6 1|
|12 7|

Pin	Wire Color	Function
1	L-BU	Telephone Audio Signal (-)
2	GY	Remote Radio Right Audio Signal
3	BN/WH	Remote Radio Audio Output (-)
4	BK	Battery Positive Voltage
5	WH	Telephone Audio Signal Mute
6	L-GN	Low Speed GMLAN Serial Data
7	D-BU	Telephone Audio Signal (+)
8	GY/BK	Right Radio Audio Output
9	D-GN	Left Radio Audio Output

Omitted pins are Not Connected.

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Pontiac (2008-2010) G8 Head Unit visual pinout:

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OEM radio stereo harness pin assignment