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

Power, Serial Data, and MIL


Object Number: 1500957  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Control Module References
Engine Data Sensors - 5-Volt and Low Reference
OBD II Symbol Description Notice
B+ Bussing
B+ Bussing
Underhood Junction Block - IBCM Batt1, BCM - Radio/RFA, Ignigion Sensor, HVAC BATT, Cluster/Theft, Air Bag Batt Fuses
Underhood Junction Block - IBCM Batt1, BCM - Radio/RFA, Ignigion Sensor, HVAC BATT, Cluster/Theft, Air Bag Batt Fuses
G103, G104 and G105
Power, Ground, Class 2 and High Speed Serial Data
G109
Figure 2:

Engine Data Sensors - 5-Volt and Low Reference


Object Number: 1500959  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Control Module References
Engine Data Sensors - Pressure and Temperature
Power, Serial Data, and MIL
OBD II Symbol Description Notice
Figure 3:

Engine Data Sensors - Pressure and Temperature


Object Number: 1500961  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Control Module References
Engine Data Sensors - Heated Oxygen Sensors
Engine Data Sensors - 5-Volt and Low Reference
OBD II Symbol Description Notice
Air, A/C Clutch, ECT IGN, ERLS #1 Fuses
Transmission Solenoids and VSS
G103, G104 and G105
Figure 4:

Engine Data Sensors - Heated Oxygen Sensors


Object Number: 1500962  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Control Module References
Engine Data Sensors - Electronic Throttle Controls
Engine Data Sensors - Pressure and Temperature
OBD II Symbol Description Notice
Air, A/C Clutch, ECT IGN, ERLS #1 Fuses
Figure 5:

Engine Data Sensors - Electronic Throttle Controls


Object Number: 1500963  Size: FS
Master Electrical Component List
Throttle Actuator Control (TAC) System Description
Control Module References
Ignition Controls - Ignition System
Engine Data Sensors - Heated Oxygen Sensors
OBD II Symbol Description Notice
B+ Bussing
B+ Bussing
Turn Signals and Stop Lamps
G103, G104 and G105
Figure 6:

Ignition Controls - Ignition System


Object Number: 1500965  Size: FS
Master Electrical Component List
Electronic Ignition (EI) System Description
Control Module References
Fuel Controls - Fuel Pump Controls
Engine Data Sensors - Electronic Throttle Controls
OBD II Symbol Description Notice
Run/Crank ICBM, Transmission, Injectors, ABS, PCM IGN, IGN Fuses
Run/Crank ICBM, Transmission, Injectors, ABS, PCM IGN, IGN Fuses
Engine Controls Schematic Icons
Engine Controls Schematic Icons
G106
Figure 7:

Fuel Controls - Fuel Pump Controls


Object Number: 1500966  Size: FS
Master Electrical Component List
Fuel System Description
Control Module References
Fuel Controls - Fuel Injectors and EVAP
Ignition Controls - Ignition System
OBD II Symbol Description Notice
Underhood Fuse Block - Run Relay, RBEC Battery 2 Fuses, Rear Fuse BLock - Driver Power Seat, Fuel Pump, Park Lamps, Trunk Release, ERLS Fuses
G302
Indicators
Figure 8:

Fuel Controls - Fuel Injectors and EVAP


Object Number: 1500967  Size: FS
Master Electrical Component List
Fuel System Description
Control Module References
Controlled/Monitored Subsystem References
Fuel Controls - Fuel Pump Controls
OBD II Symbol Description Notice
Run/Crank ICBM, Transmission, Injectors, ABS, PCM IGN, IGN Fuses
Air, A/C Clutch, ECT IGN, ERLS #1 Fuses
Underhood Fuse Block - Run Relay, RBEC Battery 2 Fuses, Rear Fuse BLock - Driver Power Seat, Fuel Pump, Park Lamps, Trunk Release, ERLS Fuses
Figure 9:

Controlled/Monitored Subsystem References


Object Number: 1500968  Size: FS
Master Electrical Component List
Exhaust Gas Recirculation (EGR) System Description
Control Module References
Transmission Control References
Fuel Controls - Fuel Injectors and EVAP
OBD II Symbol Description Notice
Power, Ground, A/C Compressor Clutch and Blower Motor Controls
Power, Ground, and Blower Motor Controls
Starting
Charging
Indicators
Engine Cooling Fans
Figure 10:

Transmission Control References


Object Number: 1500971  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Control Module References
Controlled/Monitored Subsystem References
OBD II Symbol Description Notice
Transmission Solenoids and VSS
Transmission Switches, TFT and A/T ISS Sensor
Tap Up/Tap Down
Transmission Switches, TFT and A/T ISS Sensor
PNP Switch