GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2009 🢒 Sierra Denali 🢒 Power and Signal Distribution 🢒 Data Communications 🢒 Data Communication Schematics
Figure 1:

Low Speed Bus - 1 of 3
Object Number: 2064935 Size: FS
Figure 2:

Low Speed Bus - 2 of 3
Object Number: 2064937 Size: FS
Figure 3:

Low Speed Bus - 3 of 3
Object Number: 2064939 Size: FS
Figure 4:

High Speed Bus - 1 of 6 (except MEX/HP2)
Object Number: 2064942 Size: FS
Figure 5:

High Speed Bus - 2 of 6 (except MEX/HP2)
Object Number: 2064945 Size: FS
Figure 6:

High Speed Bus - 3 of 6 (Diesel)
Object Number: 2064947 Size: FS
Figure 7:

High Speed Bus - 4 of 6 (MEX)
Object Number: 2064950 Size: FS
Figure 8:

High Speed Bus - 5 of 6 (HP2)
Object Number: 2165233 Size: FS
Figure 9:

High Speed Bus - 6 of 6 (HP2)
Object Number: 2165234 Size: FS
Figure 10:

Serial Data Communication Enable
Object Number: 2064954 Size: FS
Figure 11:

Accessory Wakeup Serial Data
Object Number: 2064958 Size: FS
Figure 12:

Powertrain Expansion Bus (HP2)
Object Number: 2165236 Size: FS
Figure 13:

Serial Data Gateway (SDG) Module (HP2)
Object Number: 2165237 Size: FS