GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2002 🢒 GMC K Sierra - 4WD 🢒 Body and Accessories 🢒 Cellular Communication 🢒 OnStar Schematics
Figure 1:

Power, Ground and DLC
Object Number: 778188 Size: FS
Figure 2:

Communication Controls
Object Number: 701587 Size: FS
Master Electrical Component List
OnStar Description and Operation
OnStar to Radio Control
Power, Ground and DLC
Figure 3:

OnStar to Radio Control
Object Number: 778191 Size: FS