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

UBEC Power, Grounding, Generator, And MIL


Object Number: 155969  Size: FS
Utility Fuel Pump Controls
Utility Fuel Pump Controls
Engine Controls Components
Vehicle Control Module Description
Power Sheet 2: W/ Two Wheel Drive
Handling Electrostatic Discharge Sensitive Parts Notice
OBD II Symbol Description Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Figure 2:

Power Sheet 2: W/ Two Wheel Drive


Object Number: 155970  Size: FS
Handling Electrostatic Discharge Sensitive Parts Notice
Automatic Transmission Valve Controls
OBD II Symbol Description Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
Power Sheet 2: W/ Electric Shift 4WD
UBEC Power, Grounding, Generator, And MIL
Figure 3:

Power Sheet 2: W/ Electric Shift 4WD


Object Number: 155971  Size: FS
Handling Electrostatic Discharge Sensitive Parts Notice
Automatic Transmission Valve Controls
Electric Shift Control Switch
Electric Shift Front Axle Switch
OBD II Symbol Description Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Electric Shift Front Axle Switch
Engine Controls Components
Vehicle Control Module Description
Power Sheet 2: W/ Automatic 4WD
Power Sheet 2: W/ Two Wheel Drive
Figure 4:

Power Sheet 2: W/ Automatic 4WD


Object Number: 155972  Size: FS
Handling Electrostatic Discharge Sensitive Parts Notice
Automatic Transmission Valve Controls
Handling Electrostatic Discharge Sensitive Parts Notice
Cell 38: Power, Ground, Motor Controls and Data Link
OBD II Symbol Description Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
Data Link Connector
Power Sheet 2: W/ Electric Shift 4WD
Figure 5:

Data Link Connector


Object Number: 155973  Size: FS
Engine Controls Components
Vehicle Control Module Description
Ignition Controls
Power Sheet 2: W/ Automatic 4WD
Handling Electrostatic Discharge Sensitive Parts Notice
OBD II Symbol Description Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Figure 6:

Ignition Controls


Object Number: 155974  Size: FS
MAF Sensor And EVAP Valves
Handling Electrostatic Discharge Sensitive Parts Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
Utility Fuel Level Sensor
Data Link Connector
OBD II Symbol Description Notice
Figure 7:

Utility Fuel Level Sensor


Object Number: 155975  Size: FS
Utility Fuel Pump Controls
Utility Fuel Pump Controls
Utility Engine Sensors
OBD II Symbol Description Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Utility Engine Sensors
Handling Electrostatic Discharge Sensitive Parts Notice
OBD II Symbol Description Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
Pickup Fuel Level Sensor
Ignition Controls
Figure 8:

Pickup Fuel Level Sensor


Object Number: 155976  Size: FS
Pickup Fuel Pump Controls
Pickup Fuel Pump Controls
Pickup Engine Sensors
Pickup Engine Sensors
OBD II Symbol Description Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Handling Electrostatic Discharge Sensitive Parts Notice
OBD II Symbol Description Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
Utility Fuel Pump Controls
Utility Fuel Level Sensor
Figure 9:

Utility Fuel Pump Controls


Object Number: 155977  Size: FS
UBEC Power, Grounding, Generator, And MIL
OBD II Symbol Description Notice
OBD II Symbol Description Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Heated Oxygen Sensors
Engine Controls Components
Vehicle Control Module Description
Pickup Fuel Pump Controls
Pickup Fuel Level Sensor
Figure 10:

Pickup Fuel Pump Controls


Object Number: 155978  Size: FS
UBEC Power, Grounding, Generator, And MIL
OBD II Symbol Description Notice
OBD II Symbol Description Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Heated Oxygen Sensors
Engine Controls Components
Vehicle Control Module Description
Fuel Injection Controls
Utility Fuel Pump Controls
Figure 11:

Fuel Injection Controls


Object Number: 155979  Size: FS
Handling Electrostatic Discharge Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
Utility Engine Sensors
Pickup Fuel Pump Controls
OBD II Symbol Description Notice
Figure 12:

Utility Engine Sensors


Object Number: 155980  Size: FS
EGR And IAC Valves
Utility Fuel Level Sensor
EGR And IAC Valves
Automatic Transmission Switch Inputs
Handling Electrostatic Discharge Sensitive Parts Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
Pickup Engine Sensors
Fuel Injection Controls
OBD II Symbol Description Notice
Figure 13:

Pickup Engine Sensors


Object Number: 155982  Size: FS
EGR And IAC Valves
Pickup Fuel Level Sensor
EGR And IAC Valves
Automatic Transmission Switch Inputs
Handling Electrostatic Discharge Sensitive Parts Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
MAF Sensor And EVAP Valves
Utility Engine Sensors
OBD II Symbol Description Notice
Figure 14:

MAF Sensor And EVAP Valves


Object Number: 155983  Size: FS
Ignition Controls
Engine Controls Components
Vehicle Control Module Description
EGR And IAC Valves
Pickup Engine Sensors
OBD II Symbol Description Notice
Figure 15:

EGR And IAC Valves


Object Number: 155984  Size: FS
Utility Engine Sensors
Utility Engine Sensors
Handling Electrostatic Discharge Sensitive Parts Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
Heated Oxygen Sensors
MAF Sensor And EVAP Valves
OBD II Symbol Description Notice
Figure 16:

Heated Oxygen Sensors


Object Number: 155985  Size: FS
Handling Electrostatic Discharge Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
Brake Switch Input W/ A/T W/O Auto 4WD
EGR And IAC Valves
OBD II Symbol Description Notice
Figure 17:

Brake Switch Input W/ A/T W/O Auto 4WD


Object Number: 155986  Size: FS
Handling Electrostatic Discharge Sensitive Parts Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Brake Control Module Power And Grounding
OBD II Symbol Description Notice
Brake Control Module Power And Grounding
Handling Electrostatic Discharge Sensitive Parts Notice
Handling Electrostatic Discharge Sensitive Parts Notice
OBD II Symbol Description Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
Brake Switch Input W/ A/T, W/ Auto 4WD
Heated Oxygen Sensors
Figure 18:

Brake Switch Input W/ A/T, W/ Auto 4WD


Object Number: 177623  Size: FS
Handling Electrostatic Discharge Sensitive Parts Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Brake Control Module Power And Grounding
Brake Control Module Power And Grounding
Handling Electrostatic Discharge Sensitive Parts Notice
OBD II Symbol Description Notice
OBD II Symbol Description Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
Brake Switch Input W/ M/T
Brake Switch Input W/ A/T W/O Auto 4WD
Figure 19:

Brake Switch Input W/ M/T


Object Number: 155987  Size: FS
Handling Electrostatic Discharge Sensitive Parts Notice
Brake Control Module Power And Grounding
Handling Electrostatic Discharge Sensitive Parts Notice
OBD II Symbol Description Notice
Brake Control Module Power And Grounding
Handling Electrostatic Discharge Sensitive Parts Notice
Handling Electrostatic Discharge Sensitive Parts Notice
OBD II Symbol Description Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
Electric Shift 4WD Inputs
Brake Switch Input W/ A/T, W/ Auto 4WD
Figure 20:

Electric Shift 4WD Inputs


Object Number: 155988  Size: FS
Electric Shift Control Switch
Handling Electrostatic Discharge Sensitive Parts Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Brake Control Module Power And Grounding
Handling Electrostatic Discharge Sensitive Parts Notice
OBD II Symbol Description Notice
Engine Controls Components
Vehicle Control Module Description
Vehicle Speed Sensor W/ 2WD Or Electric Shift 4WD
Brake Switch Input W/ M/T
Figure 21:

Vehicle Speed Sensor W/ 2WD Or Electric Shift 4WD


Object Number: 177625  Size: FS
Heated Oxygen Sensors
Handling Electrostatic Discharge Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
Vehicle Speed Sensor W/ Auto 4WD
Electric Shift 4WD Inputs
OBD II Symbol Description Notice
Figure 22:

Vehicle Speed Sensor W/ Auto 4WD


Object Number: 177627  Size: FS
Heated Oxygen Sensors
Handling Electrostatic Discharge Sensitive Parts Notice
Cell 38: Transfer Case Vehicle Speed Sensors
Cell 38: Transfer Case Vehicle Speed Sensors
Engine Controls Components
Vehicle Control Module Description
Vehicle Speed Outputs And Overhead Console Link
Vehicle Speed Sensor W/ 2WD Or Electric Shift 4WD
OBD II Symbol Description Notice
Figure 23:

Vehicle Speed Outputs And Overhead Console Link


Object Number: 155989  Size: FS
Handling Electrostatic Discharge Sensitive Parts Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Electric Shift Front Axle Switch
OBD II Symbol Description Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
Automatic Transmission Valve Controls
Vehicle Speed Sensor W/ Auto 4WD
Figure 24:

Automatic Transmission Valve Controls


Object Number: 155990  Size: FS
Handling Electrostatic Discharge Sensitive Parts Notice
OBD II Symbol Description Notice
OBD II Symbol Description Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
Automatic Transmission Switch Inputs
Vehicle Speed Outputs And Overhead Console Link
OBD II Symbol Description Notice
Figure 25:

Automatic Transmission Switch Inputs


Object Number: 155991  Size: FS
Utility Engine Sensors
Handling Electrostatic Discharge Sensitive Parts Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
Manual A/C Compressor Control
Automatic Transmission Valve Controls
OBD II Symbol Description Notice
Figure 26:

Manual A/C Compressor Control


Object Number: 155995  Size: FS
Heated Oxygen Sensors
Handling Electrostatic Discharge Sensitive Parts Notice
OBD II Symbol Description Notice
Engine Controls Components
Vehicle Control Module Description
Automatic A/C Compressor Control
Automatic Transmission Switch Inputs
Figure 27:

Automatic A/C Compressor Control


Object Number: 155999  Size: FS
Heated Oxygen Sensors
Handling Electrostatic Discharge Sensitive Parts Notice
Handling Electrostatic Discharge Sensitive Parts Notice
OBD II Symbol Description Notice
Engine Controls Components
Vehicle Control Module Description
Manual A/C Compressor Control