GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2006 🢒 Yukon XL - 2WD 🢒 Accessories 🢒 Cellular Communication 🢒 OnStar Schematics
Figure 1:

w/o Y91
Object Number: 1608871 Size: FS
Master Electrical Component List
OnStar Description and Operation
Control Module References
OnStar - w/ Y91
B+ Bus - 1 of 2
CIG LTR, EAP, and INFO Fuses
SP207
Cellular Communication Schematic Icons
G200 3 of 3
G203 1 of 3
G203 1 of 3
G203 1 of 3
Figure 2:

w/Y91
Object Number: 1608872 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
SP207
Cellular Communication Schematic Icons
G200 3 of 3
G200 1 of 3
G200 1 of 3
G200 1 of 3
G200 3 of 3
G203 1 of 3
G203 1 of 3
G203 2 of 3