GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Avalanche - 4WD 🢒 Body and Accessories 🢒 Cellular Communication 🢒 OnStar Schematics
Figure 1:

Except Y91
Object Number: 841730 Size: FS
Master Electrical Component List
OnStar Description and Operation
OnStar - Y91 Only
B+ Bus Bar - 1 of 2
INFO, CGR LTR
G203 - 1 Of 2
G203 - 1 Of 2
G203 - 1 Of 2
G200 - 3 Of 3
G200 - 1 of 3
G200 - 1 of 3
G200 - 3 Of 3
Figure 2:

Y91 Only
Object Number: 841736 Size: FS
Master Electrical Component List
OnStar Description and Operation
OnStar - Except Y91
B+ Bus Bar - 1 of 2
INFO, CGR LTR
G203 - 1 Of 2
G203 - 1 Of 2
G200 - 3 Of 3
G200 - 3 Of 3
G200 - 1 of 3
G200 - 1 of 3