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

Power and Ground


Object Number: 666383  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Indicators and Serial Data
IGNITION, RUN, ACCESSORY, and RAP Bus Bars, RAP #1 and RAP #2 Fuses
BRAKE, CRUISE, HTR A/C, RR WPR, WS WPR, and SEO ACCY Fuses
RTD, RDO AMP, CRANK, and IGN 0 Fuses
IGNITION, RUN, and START Bus Bar
IGN 1, AIR BAG, and SEO IGN Fuses
B+ Bus Bar
AIR, RADIO, ECM B, FRT HVAC, and CIGAR Fuses
Wiper/Washer System Schematics - Front
G103 and G105 - Gas
G103 and G105 - Gas
G103 and G105 - Gas
G105 - Diesel
Figure 2:

Indicators and Serial Data


Object Number: 666387  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Gauges, VSS, and Engine Oil Signals
Power and Ground
Transfer Case Shift Control, Roof Beacon, and Inflatable Restraint IP Module Disable Switches, HVAC Control Module, IPC, and Radio
Transfer Case Shift Control and Traction Control Switches and IPC
G203 - 1 of 4
G203 - 1 of 4
Park/Turn Signal Lamps, RT TURN Fuse and LT TURN Fuse
LT TURN Fuse, RT TURN Fuse, and Turn Signal Lamps
G203 - 3 of 4 - Base Pickup
G203 - 3 of 4 - Base Pickup
Power, Ground, and MIL Control
Module Power, Ground, Serial Data, and MIL
Fuel Controls - Fuel Pump Controls
Power, Ground, and IPC
Figure 3:

Gauges, VSS, and Engine Oil Signals


Object Number: 666389  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Fuel Gauge and Fuel Pump and Sender Assembly
Indicators and Serial Data
SP205
G103 and G105 - Gas
G102, G103, and G104 - Diesel
Figure 4:

Fuel Gauge and Fuel Pump and Sender Assembly


Object Number: 776810  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Gauges, VSS, and Engine Oil Signals
SP205