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

Cell 21: ECM B, ECM I and RDO BATT Fuses, GND, Generator and MIL


Object Number: 365805  Size: FS
Cell 10: ECM B Fuse and Horn, Rear Defogger Relays
Power and Grounding Connector End Views
Cell 10: ECM I Fuse
Cell 10: AUX PWR, RDO BATT and HDLP SW Fuses
Cell 150: Power and Ground (Chevy/GMC)
Cell 10: AUX PWR, RDO BATT and HDLP SW Fuses
Engine Controls Components
Vehicle Control Module Description
Cell 21: CLSTR and 4WD Fuses
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice
Cell 81: ILLUM, CLSTR and GAUGES Fuses and Instrument Cluster
Handling ESD Sensitive Parts Notice
VCM Connector End Views
Cell 14: G103 and G105 (4.3L)
Cell 14: G103 and G105 (4.3L)
Figure 2:

Cell 21: CLSTR and 4WD Fuses


Object Number: 365811  Size: FS
Cell 81: ILLUM, CLSTR and GAUGES Fuses and Instrument Cluster
Cell 10: CRANK and CLSTR Fuses
VCM Connector End Views
Handling ESD Sensitive Parts Notice
Cell 38: Front Axle Clutch Solenoid and Front Axle Switch
Cell 38: Front Axle Clutch Solenoid and Front Axle Switch
Cell 38: Power and Ground
Cell 38: Transfer Case Encoder Motor
Cell 38: Power and Ground
Cell 10: 4WD Fuse (4.3L)
Cell 10: CRANK and CLSTR Fuses
Engine Controls Components
Vehicle Control Module Description
Cell 21: Data Link Connector
Cell 21: ECM B, ECM I and RDO BATT Fuses, GND, Generator and MIL
OBD II Symbol Description Notice
Figure 3:

Cell 21: Data Link Connector


Object Number: 365814  Size: FS
Cell 10: INT BATT Fuse
Cell 19 (Except Envoy)
Cell 14: G200, G201 and G207 (2-Door Utility w/ Endgate)
Power and Grounding Connector End Views
Cell 14: Body Relay Block and Underhood Fuse Block
Cell 14: Body Relay Block and Underhood Fuse Block
Cell 50: Power, Ground, SDM and VIU
VCM Connector End Views
Handling ESD Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
Cell 21: Ignition Controls
Cell 21: CLSTR and 4WD Fuses
OBD II Symbol Description Notice
Body Control System Connector End Views
Cell 14: G103 and G105 (4.3L)
Cell 14: G103 and G105 (4.3L)
Cell 50: Class 2 Communication (4.3L)
Cell 14: Body Relay Block and Underhood Fuse Block
Figure 4:

Cell 21: Ignition Controls


Object Number: 365820  Size: FS
Cell 10: ENG I and OXYSEN Fuses
Cell 10: ECM I Fuse
Power and Grounding Connector End Views
Cell 21: MAF Sensor and IAC Valve
Cell 81: G203, G204, Park Switch and PCM/VCM
Cell 14: G103 and G105 (4.3L)
VCM Connector End Views
Handling ESD Sensitive Parts Notice
Cell 14: G103 and G105 (4.3L)
Engine Controls Components
Vehicle Control Module Description
Cell 21: Fuel Level Sensor
Cell 21: Data Link Connector
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice
Figure 5:

Cell 21: Fuel Level Sensor


Object Number: 365821  Size: FS
Handling ESD Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
Cell 21: Fuel Pump Controls
Cell 21: Ignition Controls
OBD II Symbol Description Notice
Cell 21: Engine Sensors (Utility)
VCM Connector End Views
Handling ESD Sensitive Parts Notice
Cell 21: Engine Sensors (Pickup)
Cell 21: Engine Sensors (Pickup)
Figure 6:

Cell 21: Fuel Pump Controls


Object Number: 365823  Size: FS
VCM Connector End Views
Handling ESD Sensitive Parts Notice
Power and Grounding Connector End Views
Cell 14: G102 (Except Envoy)
Cell 10: ECM B Fuse and Horn, Rear Defogger Relays
Cell 14: G402 (Utility)
Cell 110: License and Side Marker Lamps
Cell 21: Heated Oxygen Sensors
Engine Controls Components
Vehicle Control Module Description
Cell 21: Fuel Injection Controls
Cell 21: Fuel Level Sensor
OBD II Symbol Description Notice
Figure 7:

Cell 21: Fuel Injection Controls


Object Number: 365825  Size: FS
Cell 10: ECM I Fuse
Power and Grounding Connector End Views
VCM Connector End Views
Handling ESD Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
Cell 21: Engine Sensors (Pickup)
Cell 21: Fuel Pump Controls
OBD II Symbol Description Notice
Figure 8:

Cell 21: Engine Sensors (Pickup)


Object Number: 365839  Size: FS
VCM Connector End Views
Cell 21: EGR and EVAP Valves
Cell 81: G203, G204, Park Switch and PCM/VCM
Cell 21: Fuel Level Sensor
Cell 21: EGR and EVAP Valves
Cell 21: Automatic Transmission Valve Controls
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
Cell 21: Engine Sensors (Utility)
Cell 21: Fuel Injection Controls
OBD II Symbol Description Notice
Figure 9:

Cell 21: Engine Sensors (Utility)


Object Number: 365835  Size: FS
Cell 21: EGR and EVAP Valves
VCM Connector End Views
Cell 81: G203, G204, Park Switch and PCM/VCM
Cell 21: Fuel Level Sensor
Cell 21: EGR and EVAP Valves
Cell 21: Automatic Transmission Valve Controls
Handling ESD Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
Cell 21: Heated Oxygen Sensors
Cell 21: Engine Sensors (Pickup)
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice
Figure 10:

Cell 21: Heated Oxygen Sensors


Object Number: 365841  Size: FS
Power and Grounding Connector End Views
Cell 10: ENG I and OXYSEN Fuses
VCM Connector End Views
Handling ESD Sensitive Parts Notice
Cell 14: G102 (Except Envoy)
Cell 14: G104 and G117
Engine Controls Components
Vehicle Control Module Description
Cell 21: MAF Sensor and IAC Valve
Cell 21: Engine Sensors (Utility)
OBD II Symbol Description Notice
Figure 11:

Cell 21: MAF Sensor and IAC Valve


Object Number: 365843  Size: FS
Power and Grounding Connector End Views
Cell 10: ENG I and OXYSEN Fuses
Cell 21: EGR and EVAP Valves
Cell 21: Ignition Controls
VCM Connector End Views
Handling ESD Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
Cell 21: EGR and EVAP Valves
Cell 21: Heated Oxygen Sensors
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice
Cell 14: G103 and G105 (4.3L)
Figure 12:

Cell 21: EGR and EVAP Valves


Object Number: 365848  Size: FS
Handling ESD Sensitive Parts Notice
Power and Grounding Connector End Views
Cell 21: MAF Sensor and IAC Valve
Cell 10: ENG I and OXYSEN Fuses
Engine Controls Components
Vehicle Control Module Description
Cell 21: AIR Pump Control
Cell 21: MAF Sensor and IAC Valve
OBD II Symbol Description Notice
VCM Connector End Views
Cell 21: Engine Sensors (Pickup)
Cell 21: Engine Sensors (Pickup)
Figure 13:

Cell 21: AIR Pump Control


Object Number: 365853  Size: FS
Power and Grounding Connector End Views
Cell 10: IGN E Fuse and A/C Compressor, Rear Defogger, DRL Relays
Cell 10: B+ Buss Bar
Cell 10: B+ Buss Bar
VCM Connector End Views
Handling ESD Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
Cell 21: Vehicle Speed Sensor
Cell 21: EGR and EVAP Valves
OBD II Symbol Description Notice
Figure 14:

Cell 21: Vehicle Speed Sensor


Object Number: 365856  Size: FS
VCM Connector End Views
Cell 21: Heated Oxygen Sensors
Cell 38: Speed Sensors
Cell 38: Speed Sensors
Cell 14: G104 and G117
Handling ESD Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
Cell 21: Brake Switch Input
Cell 21: AIR Pump Control
OBD II Symbol Description Notice
Figure 15:

Cell 21: Brake Switch Input


Object Number: 365860  Size: FS
Cell 10: STUD 2, ABS, TBC and RR W/W Fuses
Cell 44: Power and Ground
VCM Connector End Views
Handling ESD Sensitive Parts Notice
Cell 34: Clutch Pedal Position Switch and TCC/Stop Lamp Switch
Cell 34: Clutch Pedal Position Switch and TCC/Stop Lamp Switch
Cell 34: Clutch Pedal Position Switch and TCC/Stop Lamp Switch
Engine Controls Components
Vehicle Control Module Description
Cell 21: Vehicle Speed Signal, TCSCM and Front Axle Switch
Cell 21: Vehicle Speed Sensor
OBD II Symbol Description Notice
Figure 16:

Cell 21: Vehicle Speed Signal, TCSCM and Front Axle Switch


Object Number: 365863  Size: FS
Handling ESD Sensitive Parts Notice
Cell 86: Outside Ambient Temperature Display Sensor (w/ Trip Computer)
Cell 51: Power and Ground
Entertainment Connector End Views
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
Antilock Brake System Connector End Views
Handling ESD Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
Cell 21: Automatic Transmission Valve Controls
Cell 21: Brake Switch Input
OBD II Symbol Description Notice
Cell 44: Class 2 Communication
Transfer Case Control Connector End Views
Handling ESD Sensitive Parts Notice
VCM Connector End Views
Handling ESD Sensitive Parts Notice
Figure 17:

Cell 21: Automatic Transmission Valve Controls


Object Number: 365864  Size: FS
Handling Electrostatic Discharge Sensitive Parts Notice
Cell 10: CRANK and CLSTR Fuses
Cell 81: ILLUM, CLSTR and GAUGES Fuses and Instrument Cluster
Cell 138: Park/Neutral Position Switch and Automatic Transmission Controller (Utility w/ Floor Shift)
Cell 21: CLSTR and 4WD Fuses
VCM Connector End Views
Handling ESD Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
Cell 21: Automatic Transmission Switch Inputs
Cell 21: Vehicle Speed Signal, TCSCM and Front Axle Switch
OBD II Symbol Description Notice
Figure 18:

Cell 21: Automatic Transmission Switch Inputs


Object Number: 365866  Size: FS
VCM Connector End Views
Handling ESD Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
Cell 21: Manual A/C Compressor Control
Cell 21: Automatic Transmission Valve Controls
OBD II Symbol Description Notice
Tilt Wheel/Column Connector End Views
Cell 21: Engine Sensors (Pickup)
Handling ESD Sensitive Parts Notice
Cell 14: G103 and G105 (4.3L)
Cell 21: Vehicle Speed Sensor
Figure 19:

Cell 21: Manual A/C Compressor Control


Object Number: 365867  Size: FS
Cell 10: HTD SEAT, ATC, HVAC and A/C Fuses
Power and Grounding Connector End Views
Cell 10: IGN E Fuse and A/C Compressor, Rear Defogger, DRL Relays
Cell 14: G102 (Except Envoy)
Cell 21: Heated Oxygen Sensors
VCM Connector End Views
Handling ESD Sensitive Parts Notice
Cell 14: G103 and G105 (4.3L)
HVAC Connector End Views
Cell 10: HVAC and CRUISE Fuses
Engine Controls Components
Vehicle Control Module Description
Cell 21: Automatic A/C Compressor Control
Cell 21: Automatic Transmission Switch Inputs
OBD II Symbol Description Notice
Cell 63
Figure 20:

Cell 21: Automatic A/C Compressor Control


Object Number: 365868  Size: FS
Cell 10: HTD SEAT, ATC, HVAC and A/C Fuses
Power and Grounding Connector End Views
Cell 10: IGN E Fuse and A/C Compressor, Rear Defogger, DRL Relays
Cell 14: G102 (Except Envoy)
Cell 21: Heated Oxygen Sensors
Cell 14: G103 and G105 (4.3L)
VCM Connector End Views
Handling ESD Sensitive Parts Notice
Cell 50: Class 2 Communication (4.3L)
Handling ESD Sensitive Parts Notice
Engine Controls Components
Vehicle Control Module Description
Cell 21: Manual A/C Compressor Control
OBD II Symbol Description Notice