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

Power, Ground, MIL and Class 2


Object Number: 866525  Size: FS
Master Electrical Component List
Electronic Ignition (EI) System Description
Engine Data Sensors - 5 Volt and Low Reference
OBDII Symbol Description Notice
I/P BATT, TRAILER ABS, HORN IGN A, IGN B, ATC Fuses
PCM I Fuse (4.2L Engine)
AUX PWR 2, RRHVAC, AUX PWR 1, TBC 2, TBC 3, TBC 4 Fuses
Gages, Six Cylinder Engine (LL8)
TBC 5, LT DOORS, DDM;, PDM, RT DOORS Fuses
G108
Data Link Connector
Figure 2:

Engine Data Sensors -- 5 Volt and Low Reference


Object Number: 862125  Size: FS
Master Electrical Component List
Electronic Ignition (EI) System Description
Engine Data Sensors - Pressure and Temperature
Power, Ground, MIL, and Serial Data
OBDII Symbol Description Notice
Figure 3:

Engine Data Sensors -- Pressure and Temperature


Object Number: 862126  Size: FS
Master Electrical Component List
Electronic Ignition (EI) System Description
Engine Data Sensors - Oxygen Sensors
Engine Data Sensors - 5 Volt and Low Reference
OBDII Symbol Description Notice
Figure 4:

Engine Data Sensors - Oxygen Sensors


Object Number: 862127  Size: FS
Master Electrical Component List
Electronic Ignition (EI) System Description
Engine Data Sensors - Electronic Throttle Controls and VSS
Engine Data Sensors - Pressure and Temperature
OBDII Symbol Description Notice
AMP, SUNROOF, VENT WDO, REAR WIPER, LGM 2, SEATS, LR/RR LOCKS Fuses Fuses
Figure 5:

Engine Data Sensors - Electronic Throttle Controls and VSS


Object Number: 862129  Size: FS
Master Electrical Component List
Throttle Actuator Control (TAC) System Description
Ignition Controls - Ignition System
Engine Data Sensors - Oxygen Sensors
OBDII Symbol Description Notice
Vehicle Speed Sensor
Gages, Eight Cylinder Engine (LM4)
Figure 6:

Ignition Controls - Ignition Systems


Object Number: 862130  Size: FS
Master Electrical Component List
Electronic Ignition (EI) System Description
Ignition Controls - Sensors
Engine Data Sensors - Electronic Throttle Controls and VSS
OBDII Symbol Description Notice
AUX PWR 2, RRHVAC, AUX PWR 1, TBC 2, TBC 3, TBC 4 Fuses
PCM I Fuse (4.2L Engine)
Gages, Eight Cylinder Engine (LM4)
Figure 7:

Ignition Controls - Sensors


Object Number: 862133  Size: FS
Master Electrical Component List
Camshaft Actuator System Description
Fuel Pump Controls and Fuel Injectors
Ignition Controls - Ignition System
OBDII Symbol Description Notice
Figure 8:

Fuel Controls - Fuel Pump Controls and Fuel Injectors


Object Number: 862135  Size: FS
Master Electrical Component List
Fuel System Description
Fuel Controls - EVAP Controls
Ignition Controls - Sensors
OBDII Symbol Description Notice
G201-2 of 2, G305, G306
PCM I Fuse (4.2L Engine)
PCM I Fuse (4.2L Engine)
I/P BATT, TRAILER ABS, HORN IGN A, IGN B, ATC Fuses
G102, G104, G105, and G107
Figure 9:

Fuel Controls - EVAP Controls


Object Number: 862139  Size: FS
Master Electrical Component List
Evaporative Emission Control System Description
Controlled/Monitored Subsystem References
Fuel Pump Controls and Fuel Injectors
OBDII Symbol Description Notice
AMP, SUNROOF, VENT WDO, REAR WIPER, LGM 2, SEATS, LR/RR LOCKS Fuses Fuses
Figure 10:

Controlled/Monitored Subsystem References


Object Number: 862141  Size: FS
Master Electrical Component List
Electronic Ignition (EI) System Description
Transmission Control References - A/T
Fuel Controls - EVAP Controls
OBDII Symbol Description Notice
Indicators
Gages, Eight Cylinder Engine (LM4)
Transfer Case Shift Control Module, Encoder Motor
Engine Cooling
Module Power, Ground, Serial Data, Indicator, Torque and Vehicle Speed Signals
Compressor Controls and A/C Sensors
Compressor Controls and A/C Sensors
TAC Motor, APP Sensoor, On/Off Switch and Stop Lamp Switch (4.2L only)
Starting System
Charging System
Figure 11:

Transmission Control References - A/T


Object Number: 862143  Size: FS
Master Electrical Component List
Electronic Ignition (EI) System Description
Controlled/Monitored Subsystem References
OBDII Symbol Description Notice
Automatic Transmission Controls
Module Power, Ground, Serial Data, Indicator, Torque and Vehicle Speed Signals
PNP Switch and Indicator