GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Holden 🢒 2008 🢒 WM Sedan 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Data Communication Schematics
Figure 1:

Low Speed
Object Number: 2142973 Size: FS
Figure 2:

High Speed
Object Number: 2142976 Size: FS
Figure 3:

Accessory Wakeup Serial Data
Object Number: 2142936 Size: FS