GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2005 🢒 GMC Sierra Denali 🢒 Brakes 🢒 Hydraulic Brakes 🢒 Brake Warning System Schematics
Figure 1:

Power, Ground, Serial Data, Indicator Control and Switches
Object Number: 1504021 Size: FS
Master Electrical Component List
Brake Warning System Description and Operation
Control Module References
Supplimental Brake Assist
Power, Ground, DLC and Splice Pack SP 205
G104, G106, G107 and G110
Figure 2:

Supplemental Brake Assist
Object Number: 1504028 Size: FS
Master Electrical Component List
Brake Assist System Description and Operation Hydraulic Assist
Control Module References
Power, Ground, Serial Data, Indicator Control, and Switches
Ignition Switch - ACC/RUN and RUN/START Bus Bars and IGN B Fuse
B+ Bar Bus
G104, G106, G107 and G110
ETC/ECM, INJ 1, INJ 2, PCM 1, and SBA Fuses - Gas
ETC/ECM, INJ 1, INJ 2, PCM 1, and SBA Fuses - Gas
Gages, Vehicle Speed Signal, Engine Oil Pressure, and Fuel Level Sensors
G104, G106, G107 and G110
G203 - 1 of 2
G115 and G200 - 1 of 2