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

Low Speed GMLAN


Object Number: 2080137  Size: FS
Figure 2:

High Speed GMLAN 4.3L/4.8L/5.3L/6.0L


Object Number: 2080142  Size: FS
Figure 3:

High Speed GMLAN 6.6L


Object Number: 2081025  Size: FS