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

ECM Power, Ground, MIL, and Serial Data


Object Number: 1899454  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
5-Volt Reference Bussing
Fuse Block - Underhood Bussing
COOLFAN, AMP, HVAC, ABS, W/S WASH/INTERCOOL, MRRTD, ECM/TCM, HORN, and BATT2 Fuses
COOLFAN, AMP, HVAC, ABS, W/S WASH/INTERCOOL, MRRTD, ECM/TCM, HORN, and BATT2 Fuses
ETC, O2 SEN, EMISSION, ODD INJ, EVEN INJ Fuses, and IGN 1 Relay
CLSTR/HUD, DECK LID CLOSE/PARK/BRK B, DR LOCKS, INTERIOR LIGHTS, HVAC/PWR SND, ISRVM/HVAC, TUTD SW STRG COL SW Fuses, and RUN/CRANK Relay
RPA/H/C SEAT/WIPR RELAYS, GMLAN DEVICES, ECM, SCMPSIR SW, ACC/TCM, and ABS/MRRTD/AFS Fuses
RPA/H/C SEAT/WIPR RELAYS, GMLAN DEVICES, ECM, SCMPSIR SW, ACC/TCM, and ABS/MRRTD/AFS Fuses
Power, Ground, and DLC
Power, Ground, and DLC
Power, Ground, and DLC
Power, Ground, and Class 2
GMLAN
G104, and G106
Figure 2:

5-Volt Reference Bussing


Object Number: 1899472  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Low Reference Bussing
ECM Power, Ground, MIL, and Serial Data
Figure 3:

Low Reference Bussing


Object Number: 1899476  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
MAF/IAT, ECT, MAP Sensors, and Stop Lamp Switch Signal
5-Volt Reference Bussing
Figure 4:

MAF/IAT, ECT, MAP Sensors, and Stop Lamp Switch Signal


Object Number: 1899480  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Heated Oxygen Sensors
Low Reference Bussing
Fuse Block - Underhood Bussing
ETC, O2 SEN, EMISSION, ODD INJ, EVEN INJ Fuses, and IGN 1 Relay
Stop and License Lamps
Gages
Power, Ground, and Serial Data
G104, and G106
Figure 5:

Heated Oxygen Sensors


Object Number: 1899484  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Electronic Throttle Controls
MAF/IAT, ECT, MAP Sensors, and Stop Lamp Switch Signal
ETC, O2 SEN, EMISSION, ODD INJ, EVEN INJ Fuses, and IGN 1 Relay
Figure 6:

Electronic Throttle Controls


Object Number: 1899485  Size: FS
Master Electrical Component List
Throttle Actuator Control (TAC) System Description
Control Module References
Ignition Coils Bank 1
Heated Oxygen Sensors
Figure 7:

Ignition Coils Bank 1


Object Number: 1899486  Size: FS
Master Electrical Component List
Electronic Ignition (EI) System Description
Control Module References
Ignition Coils Bank 2
Electronic Throttle Controls
Fuse Block - Underhood Bussing
ETC, O2 SEN, EMISSION, ODD INJ, EVEN INJ Fuses, and IGN 1 Relay
G105, G107, G109, G110, G111, and G112
Figure 8:

Ignition Coils Bank 2


Object Number: 1899490  Size: FS
Master Electrical Component List
Electronic Ignition (EI) System Description
Control Module References
CKP and KS Sensors
Ignition Coils Bank 1
Fuse Block - Underhood Bussing
ETC, O2 SEN, EMISSION, ODD INJ, EVEN INJ Fuses, and IGN 1 Relay
G105, G107, G109, G110, G111, and G112
Figure 9:

CKP and KS Sensors


Object Number: 1899492  Size: FS
Master Electrical Component List
Electronic Ignition (EI) System Description
Control Module References
CMP Sensors, and Actuators
Ignition Coils Bank 2
Gages
Figure 10:

CMP Sensors, and Actuators


Object Number: 1899494  Size: FS
Master Electrical Component List
Camshaft Actuator System Description
Control Module References
Fuel Injectors
CKP and KS Sensors
Figure 11:

Fuel Injectors


Object Number: 1899497  Size: FS
Master Electrical Component List
Fuel System Description
Control Module References
EVAP Solenoids and FTP Sensor
CMP Sensors, and Actuators
Fuse Block - Underhood Bussing
ETC, O2 SEN, EMISSION, ODD INJ, EVEN INJ Fuses, and IGN 1 Relay
ETC, O2 SEN, EMISSION, ODD INJ, EVEN INJ Fuses, and IGN 1 Relay
Figure 12:

EVAP Solenoids, and FTP Sensor


Object Number: 1899498  Size: FS
Master Electrical Component List
Evaporative Emission Control System Description
Control Module References
Fuel Pump Controls
Fuel Injectors
Fuse Block - Underhood Bussing
Fuse Block - Underhood Bussing
ETC, O2 SEN, EMISSION, ODD INJ, EVEN INJ Fuses, and IGN 1 Relay
COOLFAN, AMP, HVAC, ABS, W/S WASH/INTERCOOL, MRRTD, ECM/TCM, HORN, and BATT2 Fuses
Gages
Figure 13:

Fuel Pump Controls


Object Number: 1899503  Size: FS
Master Electrical Component List
Fuel System Description
Control Module References
Controlled/Monitored Subsystem References
EVAP Solenoids and FTP Sensor
Gages
Fuse Block - Underhood Bussing
G102
G302, G401, and G402
Figure 14:

Controlled/Monitored Subsystem References


Object Number: 1899505  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Fuel Pump Controls
Starting
A/C Compressor Controls
Engine Cooling Schematics
4.6L Engine Mechanical Schematics
Gages