GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2009 🢒 Sierra - 2WD 🢒 Power and Signal Distribution 🢒 Wiring Systems and Power Management 🢒 Trailer Connector/Provision Schematics
Figure 1:

Trailer Connector 1 of 2
Object Number: 2065176 Size: FS
Figure 2:

Trailer Connector 2 of 2
Object Number: 2065178 Size: FS
Figure 3:

EXP
Object Number: 2065182 Size: FS