GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2009 🢒 TopKick C-Series (Conventional) C6/C7/C8 🢒 Driver Information and Entertainment 🢒 Cellular, Entertainment, and Navigation 🢒 Radio/Navigation System Schematics
Figure 1:

Radio
Object Number: 2076359 Size: FS
Figure 2:

Speakers
Object Number: 2076361 Size: FS