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

Main Relay and Powertrain Control Module (PCM) Power and Ground


Object Number: 883478  Size: FS
Master Electrical Component List
Data Link Connector (DLC), Malfunction Indicator Lamp (MIL)
OBD II Symbol Description Notice
BATT, ABS, FI and ACC Fuses
G103
G100, G101 and G102
HAZ, D/L, TAIL, STOP and DOME Fuses
IG Fuse, S205 and S101
HAZ, D/L, TAIL, STOP and DOME Fuses
IG Fuse, S205 and S101
Figure 2:

Data Link Connector (DLC), Malfunction Indicator Lamp (MIL)


Object Number: 883479  Size: FS
Master Electrical Component List
Exhaust Gas Recirculation (EGR) Valve and EVAP Solenoids
Main Relay and Powertrain Control Module (PCM) Power and Ground
OBD II Symbol Description Notice
SP200 and G200
S248
SIR Schematics
HAZ, D/L, TAIL, STOP and DOME Fuses
HAZ, D/L, TAIL, STOP and DOME Fuses
IG Fuse, S205 and S101
TURN and WIP Fuses
Power, O/D OFF, 4WD, MIL, CRUISE, Charge Indicators
Figure 3:

Exhaust Gas Recirculation (EGR) Valve and EVAP Solenoids


Object Number: 883480  Size: FS
Master Electrical Component List
Idle Air Control (IAC) Valve, Mass Air Flow (MAF) Sensor, Vehicle Speed Sensor
Data Link Connector (DLC), Malfunction Indicator Lamp (MIL)
OBD II Symbol Description Notice
BATT, ABS, FI and ACC Fuses
Figure 4:

Idle Air Control (IAC) Valve, Mass Air Flow (MAF) Sensor, Vehicle Speed Sensor (VSS)


Object Number: 883481  Size: FS
Master Electrical Component List
Ignition System
Exhaust Gas Recirculation (EGR) Valve and EVAP Solenoids
OBD II Symbol Description Notice
BATT, ABS, FI and ACC Fuses
Cruise Control Servo, Vehicle Speed Sensor (VSS)
G103
Figure 5:

Ignition System


Object Number: 883482  Size: FS
Master Electrical Component List
Fuel Injectors
Idle Air Control (IAC) Valve, Mass Air Flow (MAF) Sensor, Vehicle Speed Sensor
OBD II Symbol Description Notice
IG Fuse, S205 and S101
IG Fuse, S205 and S101
Radio Schematic
G103
Figure 6:

Fuel Injectors


Object Number: 883484  Size: FS
Master Electrical Component List
ECT, TPS, MAP, FTP and IAT Sensors
Ignition System
OBD II Symbol Description Notice
BATT, ABS, FI and ACC Fuses
Figure 7:

ECT, TP, MAP, FTP and IAT Sensors


Object Number: 883486  Size: FS
Master Electrical Component List
Fuel Pump, Fuel Sender Assembly
Fuel Injectors
OBD II Symbol Description Notice
Figure 8:

Fuel Pump and Fuel Sender Assembly


Object Number: 883487  Size: FS
Master Electrical Component List
Crankshaft Position (CKP), Camshaft Position (CMP), Knock (KS) Sensors
ECT, TPS, MAP, FTP and IAT Sensors
OBD II Symbol Description Notice
BATT, ABS, FI and ACC Fuses
G103
G400 and G401
IG Fuse, S205 and S101
IG Fuse, S205 and S101
Figure 9:

Camshaft Position (CMP), Crankshaft Position (CKP) and Knock Sensors (KS)


Object Number: 883489  Size: FS
Master Electrical Component List
Heated Oxygen Sensors (HO2S) Fuse and Relay
Fuel Pump, Fuel Sender Assembly
OBD II Symbol Description Notice
BATT, ABS, FI and ACC Fuses
IG Fuse, S205 and S101
TURN and WIP Fuses
Oil Pressure Indicator, Fuel, ECT Gauges, Tachometer
G100, G101 and G102
Figure 10:

Heated Oxygen Sensors (HO2S) Fuse and Relay


Object Number: 883491  Size: FS
Master Electrical Component List
Heated Oxygen Sensors (HO2S)
Crankshaft Position (CKP), Camshaft Position (CMP), Knock (KS) Sensors
OBD II Symbol Description Notice
IG Fuse, S205 and S101
IG Fuse, S205 and S101
G104
H/L, L, H/L, R, HTR, IG and LAMP Fuses
Ignition Switch
Figure 11:

Heated Oxygen Sensors (HO2S)


Object Number: 883492  Size: FS
Master Electrical Component List
Transmission Range Switch
Heated Oxygen Sensors (HO2S) Fuse and Relay
OBD II Symbol Description Notice
ECT, TPS, MAP, FTP and IAT Sensors
ECT, TPS, MAP, FTP and IAT Sensors
G100, G101 and G102
Figure 12:

Transmission Range Switch


Object Number: 883494  Size: FS
Master Electrical Component List
Four Wheel Drive Switches, Front Drive Axle Actuator Pump
Heated Oxygen Sensors (HO2S)
OBD II Symbol Description Notice
Figure 13:

Four Wheel Drive Switches and Indicator, Front Drive Axle Actuator Pump


Object Number: 883495  Size: FS
Master Electrical Component List
Stoplamp Switch, Transmission Range Switch
Transmission Range Switch
OBD II Symbol Description Notice
SP201 and G201
SP201 and G201
G105
Power, O/D OFF, 4WD, MIL, CRUISE, Charge Indicators
TURN and WIP Fuses
TURN and WIP Fuses
Figure 14:

Stoplamp Switch, Transmission Range Switch


Object Number: 883497  Size: FS
Master Electrical Component List
Input and Output Shaft Speed Sensors, Torque Converter Clutch (TCC) Solenoid
Four Wheel Drive Switches, Front Drive Axle Actuator Pump
OBD II Symbol Description Notice
HAZ, D/L, TAIL, STOP and DOME Fuses
TURN and WIP Fuses
HAZ, D/L, TAIL, STOP and DOME Fuses
Stoplamps
Backup Lamps
TURN and WIP Fuses
Figure 15:

Input and Output Shaft Speed Sensors, Torque Converter Clutch (TCC) Solenoid


Object Number: 883498  Size: FS
Master Electrical Component List
Overdrive Switch, Shift Program Switch
Stoplamp Switch, Transmission Range Switch
OBD II Symbol Description Notice
Figure 16:

Overdrive Switch and Indicator, Shift Program Switch and Indicator


Object Number: 883499  Size: FS
Master Electrical Component List
Powertrain Control Module (PCM) Idle-Up Inputs
Input and Output Shaft Speed Sensors, Torque Converter Clutch (TCC) Solenoid
OBD II Symbol Description Notice
Instrument Panel Lamp Dimmer Control
SP201 and G201
SP201 and G201
TURN and WIP Fuses
TURN and WIP Fuses
Power, O/D OFF, 4WD, MIL, CRUISE, Charge Indicators
Figure 17:

Powertrain Control Module (PCM) Idle-Up Inputs


Object Number: 884486  Size: FS
Master Electrical Component List
Overdrive Switch, Shift Program Switch
OBD II Symbol Description Notice
Defogger Schematics
Blower Control with A/C
Side Marker Lamps, Light Switch, Ambient Light Sensor