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

Power, Ground and Serial Data


Object Number: 1255363  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Gages
B+ Bus - Underhood Fuse Block
IGN B Fuse, ACCY/RUN and RUN/START Bus Bars
Spare, IGN E, SIR, TBC IGN 1 and ISRV Fuses
Spare, IGN E, SIR, TBC IGN 1 and ISRV Fuses
G302
G303 and G304
Data Link Connector (DLC)
Figure 2:

Gages


Object Number: 1255364  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Indicators
Power, Ground and Serial Data
Data Link Connector (DLC)
Fuel Controls - Fuel Pump Controls
Fuel Controls - Fuel Pump Controls
Figure 3:

Indicators


Object Number: 1255365  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Gages
Turn Signals
Data Link Connector (DLC)
Brake Warning System Schematics
G103, G104, G105, G106, G300 and G301