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

Power, Ground, Serial Data, and Traction Controls
Object Number: 2132693 Size: FS
Figure 2:

Wheel Speed Signals
Object Number: 2132697 Size: FS
Figure 3:

Vehicle Stability (JL4)
Object Number: 2064635 Size: FS