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

Oil Pressure, Coolant Temperature, and Voltage Gauges, Battery and Check Gauges Indicators


Object Number: 651761  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Speedometer, Tachometer, and Fuel Gauge
Pwr Wdos Circuit Breaker, Wiper, Radio, Clock, and Trans Fuses
IGN A Fuse and Ignition Switch
IGN A Fuse and Ignition Switch
Gauges Fuse and Turn-B/U Fuse
Speedometer, Tachometer, and Fuel Gauge
G104, L65
G104, L18, 1 of 2, All Except HO2S Circuit
L18 Charging
L65 Charging (Single Generator)
L65 Charging (Dual Generators)
Figure 2:

Speedometer, Tachometer, and Fuel Gauge


Object Number: 651763  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Indicators and Illumination Lamps
Oil Pressure, Coolant Temperature, and Voltage Gauges, Battery and Check Gauges Indicators
Oil Pressure, Coolant Temperature, and Voltage Gauges, Battery and Check Gauges Indicators
Indicators and Illumination Lamps
Vehicle Speed Sensor Circuits
Vehicle Speed Sensor Circuits
Fuel Tank Level Sensor Circuits
Fuel Tank Level Sensor Circuits
Figure 3:

Indicators and Illumination Lamps


Object Number: 651765  Size: FS
Master Electrical Component List
Indicator/Warning Message Description and Operation
Fuel Tank Level Sensor Circuits
Speedometer, Tachometer, and Fuel Gauge
Speedometer, Tachometer, and Fuel Gauge
Audible Warnings Circuit
Park Lamps Control, Front Park, Turn, and Side Marker Lamps
Headlamps Schematics, non-DRL
Daytime Running Lamps Control Circuits
Instrument Lamps Dimming Circuits
Fuel Heater, Water-in-Fuel Sensor, and Fuel Temperature Sensor
Glow Plug Control Circuit
Low Coolant Indicator Circuit
PCM Power, Grounding, DLC, MIL, and Service Throttle Indicators
TAC Power, Grounding, Data Circuits, and Indicator Control
EBCM Power, Grounding, DLC, and Indicator Lamps
Brake Warning Lamp Circuit
Daytime Running Lamps Control Circuits
Theft Deterrent
PCM Power, Grounding, DLC, MIL, and Service Throttle Indicators
PCM Power, Grounding, DLC, and MIL
Figure 4:

Fuel Tank Level Sensor Circuits


Object Number: 730925  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Vehicle Speed Sensor Circuits
Indicators and Illumination Lamps
Speedometer, Tachometer, and Fuel Gauge
Speedometer, Tachometer, and Fuel Gauge
G104, L65
G104, L65
Figure 5:

Vehicle Speed Sensor Circuits


Object Number: 730926  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Fuel Tank Level Sensor Circuits
Speedometer, Tachometer, and Fuel Gauge
Speedometer, Tachometer, and Fuel Gauge