GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2009 🢒 STS 🢒 Power and Signal Distribution 🢒 Data Communications 🢒 OnStar Schematics
Figure 1:

UE1
Object Number: 2063478 Size: FS
Figure 2:

VCIM, DLC
Object Number: 2063483 Size: FS