GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2009 🢒 Sierra - 4WD 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Transfer Case Control Schematics
Figure 1:

Power, Ground and Shift Controls
Object Number: 2065357 Size: FS
Figure 2:

Transfer Case Controls
Object Number: 2065359 Size: FS
Figure 3:

Front Axle Controls
Object Number: 2065361 Size: FS