GM Service Manual Online
For 1990-2009 cars only
Figure 1:

Dome/Courtesy Lamps


Object Number: 1426634  Size: FS
Master Electrical Component List
Interior Lighting Systems Description and Operation
Control Module References
Dome/Courtesy Lamp Switches
Horn, Dome, Main, Amp, Onstar Fuses
Horn, Dome, Main, Amp, Onstar Fuses
Wash, RR Wip, Wiper, ECU-IG, Gauge, Heater, DEF Fuses
Fuse Block - Instrument Panel
Sunroof Schematics
Junction Block - Instrument Panel Left
SP201 and G201
SP201 and G201
Figure 2:

Dome/Courtesy Lamp Switches


Object Number: 1426635  Size: FS
Master Electrical Component List
Interior Lighting Systems Description and Operation
Control Module References
Dome/Courtesy Lamps
SP400
G202, G300, G301, G302