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

Power, Ground, Serial Data and MIL


Object Number: 1225682  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Gages and Engine Oil Pressure (EOP) Sensor
B+ BUS - Fuse Block Underhood
ACCY/RUN and RUN/START BUS BAR
IGN E, TBC IGN 1, BACK UP and BTSI Fuses
IGN E, TBC IGN 1, BACK UP and BTSI Fuses
Data Link Connector (DLC) Schematics
Power, Ground, Serial Data and MIL
G103, G104
Figure 2:

Gages and Engine Oil Pressure (EOP) Sensor


Object Number: 1225693  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Indicators and DIC Controls
Power, Ground, Serial Data and MIL
Data Link Connector (DLC) Schematics
Figure 3:

Indicator and DIC Controls


Object Number: 1225696  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Fuel Gage
Gages and Engine Oil Pressure (EOP) Sensor
Turn Signal Lamps
SIR Caution for Zoning
G200
Interior Lights Dimming Schematics
G200
Interior Lights Dimming Schematics
Figure 4:

Fuel Gage


Object Number: 1225699  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Indicators and DIC Controls
Engine Data Sensors-5 Volt and Low References
Data Link Connector (DLC) Schematics