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

Power, Ground, Serial Data, and MIL


Object Number: 1257421  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Gages
B+ Bus - Rear Fuse Block
ACCY/RUN and RUN/START Bus Bars
IGN E, TBC IGN 1, BACKUP, BTSI, and TRLR B/U Fuses
IGN E, TBC IGN 1, BACKUP, BTSI, and TRLR B/U Fuses
Power, Ground, Data Link Connector, and SP205
Wiper/Washer Switch and Washer Fluid Level Switch
Power, Ground, Serial Data, and MIL
Module Power, Ground, Serial Data, and MIL
G102
Figure 2:

Gages


Object Number: 1257424  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Indicators and DIC Controls
Power, Ground, Serial Data, and MIL
Power, Ground, Data Link Connector, and SP205
Figure 3:

Indicators and DIC Controls


Object Number: 1257425  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Fuel Gage
Gages
Left Turn Signals
Right Turn Signals
Power, Ground, Data Link Connector, and SP205
I/P Dimming Supply - 2 of 2
I/P Dimming Supply - 2 of 2
G201 - 1 of 2
G201 - 1 of 2
Figure 4:

Fuel Gage


Object Number: 1257426  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Indicators and DIC Controls
Engine Data Sensors - 5 Volt and Low Reference
Power, Ground, Data Link Connector, and SP205