GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Express 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 Body Control System Schematics
Figure 1:

Power, Ground, Serial Data and Controlled/Monitored Subsystem References
Object Number: 1403257 Size: FS
Master Electrical Component List
Body Control System Description and Operation
Control Module References
Lighting Subsystem References
B+ Bus - Underhood Fuse Block
Ignition Switch - ACCY/RUN, RUN/START Bus Bars and IGN B Fuse
BRKS, CRANK, FR WPR, HVAC, IGN 0 and TBC ACC Fuses
Ignition Switch - ACCY/RUN, RUN/START Bus Bars and IGN B Fuse
Data Link Connector (DLC) Schematics
Horns Schematics
Retained Accessory Power (RAP) Schematics
Audible Warning Schematics
Brake Warning System Schematics
Lock and Unlock Controls
Switches
Access Panel Relay Control
Theft Deterrent System Schematics
PNP Switch, Serial Data and Indicator
PNP Switch, Serial Data and Indicator
G303 and G304
Figure 2:

Lighting Subsystem References
Object Number: 1403263 Size: FS
Master Electrical Component List
Body Control System Description and Operation
Control Module References
Power, Ground, Serial Data and Controlled/Monitored Subsystem References
Courtesy Lamps (w/o YF7) - 1 of 2
Courtesy Lamps (YF7)
Dome Fluorescent Work Lamps (PRP w/UF2)
I/P Dimming Supply Voltage - 1 of 3 and LED Dimming Supply Voltage
Dome and Courtesy Lamp Switch Signals and Door Latch Assemblies
Underhood/Vanity Lamps and Door Jamb Switches
Backup (Except Cutaway), Park/Turn, and Marker Lamps
Inside Rearview Mirror Schematics
Headlights Schematics
Headlamp and Panel Dimmer Switch Signals and Park Lamp Relay Control
Dome and Courtesy Lamp Switch Signals and Door Latch Assemblies
Hazard, Turn and Stop Lamp Signals
Headlights Schematics
I/P Dimming Supply Voltage - 1 of 3 and LED Dimming Supply Voltage
Headlamp and Panel Dimmer Switch Signals and Park Lamp Relay Control
I/P Dimming Supply Voltage - 1 of 3 and LED Dimming Supply Voltage