GM Service Manual Online
For 1990-2009 cars only
Figure 1:

Except Y91


Object Number: 1242741  Size: FS
Master Electrical Component List
OnStar Description and Operation
Y91
B+ Bus Bar - 1 of 2
INFO and CIG LTR Fuses
SP207
G203 - 1 of 3
G203 - 1 of 3
G203 - 1 of 3
G200 - 3 of 3
G200 - 3 of 3
G200 - 1 of 3
G200 - 1 of 3
Figure 2:

Y91


Object Number: 1242742  Size: FS
Master Electrical Component List
OnStar Description and Operation
Except Y91
B+ Bus Bar - 1 of 2
B+ Bus Bar - 1 of 2
SP207
G203 - 1 of 3
G203 - 1 of 3
G200 - 3 of 3
G200 - 3 of 3
G200 - 1 of 3
G200 - 1 of 3