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

Power, Ground and Class 2


Object Number: 660878  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Fuel Gauge, Speedometer, Temperature Gauge and Tachometer
Underhood Fuse Block- OXY SEN and SBM LCM Fuses
Underhood Fuse Block- CRK, PCM/CRU and SBM Fuses
Underhood Fuse Block- CRK, PCM/CRU and SBM Fuses
Underhood Fuse Block- OXY SEN and SBM LCM Fuses
Underhood Fuse Block- OXY SEN and SBM LCM Fuses
Underhood Fuse Block- CRK, PCM/CRU and SBM Fuses
Underhood Fuse Block- BAT 1/ Rear Fuse Block- RDM, C/LTR, DDM, HTDSTL, TRK REL Fuses and Trunk Lid Release Relay/ IP Fuse Block- PDM, SBM, CSTR/SBM Fuses
IP Fuse Block- HVAC and A/C Fuse
Underhood Fuse Block- BAT 1/ Rear Fuse Block- RDM, C/LTR, DDM, HTDSTL, TRK REL Fuses and Trunk Lid Release Relay/ IP Fuse Block- PDM, SBM, CSTR/SBM Fuses
G202 (4 of 4)
Class 2 Serial Data Line
Figure 2:

Fuel Gauge, Speedometer, Temperature Gauge and Tachometer


Object Number: 660880  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Cruise, Fuel, Oil and Volt Indicators
Power, Ground and Class 2
Class 2 Serial Data Line
Figure 3:

Cruise, Fuel, Oil and Volt Indicators


Object Number: 660882  Size: FS
Master Electrical Component List
Indicator/Warning Message Description and Operation
Air Bag, Brake, High Beam, Lamp and Turn Signal Indicators
Fuel Gauge, Speedometer, Temperature Gauge and Tachometer
Underhood Fuse Block, RUN/CRK Fuse and IGN Relay
Underhood Fuse Block- OXY SEN and SBM LCM Fuses
Underhood Fuse Block- OXY SEN and SBM LCM Fuses
Underhood Fuse Block- BAT 1/ Rear Fuse Block- RDM, C/LTR, DDM, HTDSTL, TRK REL Fuses and Trunk Lid Release Relay/ IP Fuse Block- PDM, SBM, CSTR/SBM Fuses
Seat Belt Schematics
MIL and Data Link Connector (DLC)
Content Theft Deterrent
Brake Warning System Schematics
LH Turn Lamps
RH Turn Lamps
Headlamp Dimmer, Park Gear Input, and High Beam Indicator
Underhood Fuse Block- BAT 1/ Rear Fuse Block- RDM, C/LTR, DDM, HTDSTL, TRK REL Fuses and Trunk Lid Release Relay/ IP Fuse Block- PDM, SBM, CSTR/SBM Fuses
Indicators and Stoplamp Switch
Figure 4:

Driver Information Center


Object Number: 660887  Size: FS
Master Electrical Component List
Indicator/Warning Message Description and Operation
Air Bag, Brake, High Beam, Lamp and Turn Signal Indicators
Class 2 Serial Data Line
G100, G101, G102 and G103
G202 (4 of 4)
Sensors