GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2009 🢒 Sierra - 4WD 🢒 Driver Information and Entertainment 🢒 Cellular, Entertainment, and Navigation 🢒 Video System Schematics
Figure 1:

Display Power, Ground and Video Signals
Object Number: 2064684 Size: FS
Figure 2:

Audio Signals
Object Number: 2064687 Size: FS