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

Power, Ground, Serial Data


Object Number: 844624  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Gauges, VSS, Engine Oil Signals
B+ Bus Bar - 1 of 2
RTD, RR WPR, EAP, SUNROOF, IPC/DIC, SEO B1
Ignition, Run, Start, Accy Bus Bar
O2A, O2B, TBC IGN 1, SEO IGN
G203 - 2 Of 2
G203 - 1 Of 2
G203 - 1 Of 2
SP205 - 1 of 2
G200 - 1 of 3
G200 - 1 of 3
Figure 2:

Gages, VSS, Engine Oil Signals


Object Number: 844626  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Indicators, DIC Controls, Washer Fluid Level Sensor
Power, Ground, Serial Data
G104, G107
SP205 - 1 of 2
G102, G103
Figure 3:

Indicators, DIC Controls, Washer Fluid Level Switch


Object Number: 844629  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Fuel Gauge
Gauges, VSS, Engine Oil Signals
G203 - 3 of 3
I/P Dimming Supply Voltage - 2 of 7
G203 - 1 Of 2
G203 - 1 Of 2
G100, G101, G105, G106
Left Turn Signal - Domestic
Right Turn Signals - Domestic
Left Turn Signals - Export
Right Turn Signals - Export
Figure 4:

Fuel Gage


Object Number: 844633  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Indicators, DIC Controls, Washer Fluid Level Sensor
SP205 - 1 of 2
Fuel Controls - EVAP Controls, Fuel Tank Pressure, and EGR