GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2004 🢒 TopKick C-Series (Conventional) C4/C5 🢒 Brakes 🢒 Antilock Brake System 🢒 Antilock Brake System Schematics
Figure 1:

Module Power, Ground, Serial Data and Wheel Speed Sensors
Object Number: 797431 Size: FS
Master Electrical Component List
ABS Description and Operation
Traction Control and Brake Lamp Switch
ABS 1, ABS 2, ABS 3, E/A PUMP, and HORN Fuses/Circuit Breakers
Ignition Switch - OFF/RUN/START, RUN/START and START Bus Bars
Brake Booster Pump
ABS 1, ABS 2, ABS 3, E/A PUMP, and HORN Fuses/Circuit Breakers
START and TRANS Fuses/Circuit Breakers
ENGINE and PCM-I Fuses/Circuit Breakers
G200, G202, and G203 - 1 of 4
Hydraulic
Figure 2:

Traction Control and Brake Lamp Switch
Object Number: 1464328 Size: FS
Master Electrical Component List
ABS Description and Operation
Module Power, Ground, Serial Data, and Wheel Speed Sensors
Ignition Switch - OFF/RUN/START, RUN/START and START Bus Bars
Ignition Switch - RUN and ACC/RUN Bus Bars
GAUGES, L-RR TRUCK, R-RR TRUCK, and SIR Fuses/Circuit Breakers
AXLE/4WD, BRAKE, CHASSIS, and HTR/AC Fuses/Circuit Breakers
AXLE/4WD, BRAKE, CHASSIS, and HTR/AC Fuses/Circuit Breakers
Power and Indicators
Splice Pack SP203 (L18/LB7/LG4/LLY)
Engine Exhaust System
G101 - 2 of 2