Trailer Harness Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		X109 7-Way M (BK)
Pin	Wire Color	Circuit No.	Function
1	YE	1314	Left Turn Signal Lamp Supply Voltage
2	BK	1624	Trailer Backup Lamps Supply Voltage
3	OG	22	Ground
4	GN	5187	Right Turn Signal Lamp Supply Voltage
5	D-BU	47	Trailer Auxiliary Supply Voltage
6	RD	1620	CHMSL Supply Voltage
7	BN	2109	Trailer Park Lamps Supply Voltage