GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2008 🢒 Grand Prix 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Data Communication Schematics
Figure 1:

L26
Object Number: 1888997 Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
Control Module References
LS4
Figure 2:

LS4
Object Number: 1888998 Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
Control Module References
L26