GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Tahoe - 2WD 🢒 Accessories 🢒 Cellular Communication 🢒 OnStar Schematics
Figure 1:

OnStar - w/o Y91
Object Number: 1464854 Size: FS
Master Electrical Component List
OnStar Description and Operation
Control Module References
OnStar (Y91)
B+ Bus - 1 of 2
CIG LTR, EAP, and INFO Fuses
Splice Pack SP207
Cellular Communication Schematic Icons
G200 - 3 of 3 - S345
G203 - 1 of 3
G203 - 1 of 3
G203 - 1 of 3
Figure 2:

OnStar - w/Y91
Object Number: 1464858 Size: FS
Master Electrical Component List
OnStar Description and Operation
Control Module References
OnStar (w/o Y91)
B+ Bus - 1 of 2
CIG LTR, EAP, and INFO Fuses
Splice Pack SP207
Cellular Communication Schematic Icons
G200 - 3 of 3 - S345
G200 - 1 of 3
G200 - 1 of 3
G200 - 1 of 3
G200 - 3 of 3 - S345
G203 - 1 of 3
G203 - 1 of 3
G203 - 2 of 3