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

Underhood Lamp


Object Number: 658853  Size: FS
Master Electrical Component List
Interior Lighting Systems Description and Operation
Ashtray Lamp, Power Window and Door Lock Controls Illumination
Battery and Underhood Fuse Block
ECM-B, Horn
Figure 2:

Engine Brake Enable, Indicator and Valve


Object Number: 651585  Size: FS
Master Electrical Component List
Exhaust System Description
Engine Brake Relay and ICM Interface
Engine Brake Relay and ICM Interface
Engine Brake Relay and ICM Interface
Engine Brake Relay and ICM Interface
S219
CHAS, Axle, Circuit Breakers
S110, S112