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

Powertrain Control Module (PCM) Power and Ground


Object Number: 785454  Size: FS
Master Electrical Component List
EFI Relay, S100
OBD II Symbol Description Notice
Horn, Dome, Main, Amp Fuses
Ignition Switch (1 of 2)
Ignition Switch (2 of 2)
Ignition Switch (1 of 2)
Ignition Switch (2 of 2)
Ignition Switch (1 of 2)
G104
G103
S 100
Air Pump, Headlamps, Alt S, EFI, Hazard Fuses
S 100
G105, G106 and G107
SP201 and G201
G104
G105, G106 and G107
Figure 2:

EFI Relay, S 100


Object Number: 785457  Size: FS
Master Electrical Component List
Data Link Connector (DLC) (1 of 2)
Powertrain Control Module (PCM) Power and Ground
OBD II Symbol Description Notice
Ignition Switch (1 of 2)
Ignition Switch (2 of 2)
G103
Ignition Switch (2 of 2)
Air Pump, Headlamps, Alt S, EFI, Hazard Fuses
Figure 3:

Data Link Connector - 1 of 2


Object Number: 785476  Size: FS
Master Electrical Component List
Data Link Connector (DLC) (2 of 2)
EFI Relay, S100
OBD II Symbol Description Notice
Power, AM 1, Door, Tail, P/Point, ECU-B, Stop, OBD, INV Fuses
Junction Block-Instrument Panel Left
SP200 and G200
SIR Caution for Zoning
Figure 4:

Data Link Connector - 1 of 2


Object Number: 787259  Size: FS
Master Electrical Component List
Circuit Opening Relay, Fuel Sender Assembly
Data Link Connector (DLC) (1 of 2)
OBD II Symbol Description Notice
G104
G104
Ignition Switch (1 of 2)
Ignition Switch (2 of 2)
Charge, Air Bag, Malfunction O/D Off, Cruise Indicators
SIR Caution for Zoning
Figure 5:

Circuit Opening Relay, Fuel Sender Assembly


Object Number: 785462  Size: FS
Master Electrical Component List
Fuel Injectors
Data Link Connector (DLC) (2 of 2)
OBD II Symbol Description Notice
Ignition Switch (2 of 2)
Ignition Switch (1 of 2)
Ignition Switch (2 of 2)
G103
Air Pump, Headlamps, Alt S, EFI, Hazard Fuses
S 100
G202, G300, G301 and G302
Figure 6:

Fuel Injectors


Object Number: 785486  Size: FS
Master Electrical Component List
Idle Air Control (IAC) Valve, EVAP Solenoids
Circuit Opening Relay, Fuel Sender Assembly
OBD II Symbol Description Notice
Ignition Switch (1 of 2)
Ignition Switch (1 of 2)
Figure 7:

Idle Air Control (IAC) Valve, EVAP Solenoids


Object Number: 785470  Size: FS
Master Electrical Component List
Ignition System
Fuel Injectors
OBD II Symbol Description Notice
Ignition Switch (1 of 2)
Ignition Switch (2 of 2)
Ignition Switch (2 of 2)
S 100
Air Pump, Headlamps, Alt S, EFI, Hazard Fuses
S 100
G105, G106 and G107
Alt, ABS 2, RDI Fan, ABS 1, Fog Fuses
Figure 8:

Ignition System


Object Number: 785458  Size: FS
Master Electrical Component List
ECT, Evaporator Temperature, Fuel Tank Pressure, TPS Sensors
Idle Air Control (IAC) Valve, EVAP Solenoids
OBD II Symbol Description Notice
Ignition Switch (1 of 2)
Ignition Switch (2 of 2)
Ignition Switch (2 of 2)
G105, G106 and G107
Figure 9:

ECT, Evaporator Temperature, Fuel Tank Pressure TP Sensors


Object Number: 785465  Size: FS
Master Electrical Component List
Mass Air Flow (MAF) Sensor
Ignition System
OBD II Symbol Description Notice
Figure 10:

Mass Air Flow (MAF) Sensor


Object Number: 785466  Size: FS
Master Electrical Component List
KS, CMP, CKP Sensors, CMP Actuator Solenoid Valve
ECT, Evaporator Temperature, Fuel Tank Pressure, TPS Sensors
OBD II Symbol Description Notice
Ignition Switch (1 of 2)
Ignition Switch (2 of 2)
Ignition Switch (2 of 2)
G103
Air Pump, Headlamps, Alt S, EFI, Hazard Fuses
S 100
Figure 11:

KS, CMP, CKP Sensors, CMP Actuator Solenoid Valve


Object Number: 785460  Size: FS
Master Electrical Component List
Heated Oxygen Sensors
Mass Air Flow (MAF) Sensor
OBD II Symbol Description Notice
G104
G104
Figure 12:

Heated Oxygen Sensors


Object Number: 785467  Size: FS
Master Electrical Component List
Park Neutral Position (PNP) Switch
KS, CMP, CKP Sensors, CMP Actuator Solenoid Valve
OBD II Symbol Description Notice
Ignition Switch (1 of 2)
Ignition Switch (2 of 2)
G103
Ignition Switch (2 of 2)
G104
G104
S 100
Air Pump, Headlamps, Alt S, EFI, Hazard Fuses
S 100
Figure 13:

Park/Neutral Position Switch


Object Number: 785559  Size: FS
Master Electrical Component List
Vehicle Speed Input, Tachometer Signal
Heated Oxygen Sensors
OBD II Symbol Description Notice
Ignition Switch (1 of 2)
Ignition Switch (1 of 2)
Starting System
Back Up Lamps
Wash, RR Wip, Wiper, ECU-IG, Gauge, Heater, Def Fuses
Junction Block-Instrument Panel Right
Junction Block-Instrument Panel Right
Figure 14:

Vehicle Speed Input, Tachometer Signal


Object Number: 785468  Size: FS
Master Electrical Component List
Automatic Transmission Controls FWD
Park Neutral Position (PNP) Switch
OBD II Symbol Description Notice
Wash, RR Wip, Wiper, ECU-IG, Gauge, Heater, Def Fuses
Junction Block-Instrument Panel Right
Junction Block-Instrument Panel Right
G104
G104
Fuel Gauge, Seat Belt Low Fuel Indicators and Seat Belt Buzzer
Horn, Dome, Main, Amp Fuses
Horn, Dome, Main, Amp Fuses
Horn, Dome, Main, Amp Fuses
High Beam, Door Open Indicators and Engine Coolant Temperature (ECT) Gauge
Figure 15:

Automatic Transmission Controls FWD


Object Number: 785471  Size: FS
Master Electrical Component List
Automatic Transmission Controls AWD
Vehicle Speed Input, Tachometer Signal
OBD II Symbol Description Notice
Figure 16:

Automatic Transmission Controls AWD


Object Number: 785474  Size: FS
Master Electrical Component List
Overdrive Switch
Automatic Transmission Controls FWD
OBD II Symbol Description Notice
Figure 17:

Overdrive Switch


Object Number: 785455  Size: FS
Master Electrical Component List
Powertrain Control Module (PCM) Idle Up Inputs
Automatic Transmission Controls AWD
OBD II Symbol Description Notice
Ignition Switch (1 of 2)
Ignition Switch (2 of 2)
Charge, Air Bag, Malfunction O/D Off, Cruise Indicators
Illumination Lamps
Junction Block-Instrument Panel Right
SP201 and G201
Figure 18:

Powertrain Control Module (PCM) Idle-Up Inputs


Object Number: 785461  Size: FS
Master Electrical Component List
Overdrive Switch
OBD II Symbol Description Notice
Power, AM 1, Door, Tail, P/Point, ECU-B, Stop, OBD, INV Fuses
Tail Relay and Turn Signal/Headlamp Switch
Wash, RR Wip, Wiper, ECU-IG, Gauge, Heater, Def Fuses
Defogger Schematic
Wash, RR Wip, Wiper, ECU-IG, Gauge, Heater, Def Fuses