GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2007 🢒 Yukon XL - 2WD 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Power Moding Schematics
Figure 1:

Ignition and Accessory Voltage
Object Number: 1843654 Size: FS
Master Electrical Component List
Power Mode Description and Operation
Control Module References
Ignition 2 and 3 Voltage
B+ Bus - 1 of 3
G102 and G108
G102 and G108
Figure 2:

Ignition 1 Voltage
Object Number: 1843656 Size: FS
Master Electrical Component List
Power Mode Description and Operation
Control Module References
Ignition 2 and 3 Voltage