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

Ground, MIL, Power, and Serial Data


Object Number: 870198  Size: FS
Master Electrical Component List
Engine Control Module Description
Engine Data Sensors-5 Volt and Low Reference Bussing
OBD II Symbol Description Notice
Ignition Switch
Fuse Block-Underhood Fuses: IP BATT2 and RUN (IGN3), BCM Fuses: BCM ELECT, CLUSTER, FUELPUMP, HVAC, IGN. SW, and STOP
Fuse Block-Underhood Fuses: ABS, ABS1, ABS2, ECM, ECM/TCM, IGN, LH HDLP, PREM AUDIO, RH HDLP, and RUN/CRANK
Fuse Block-Underhood Fuses: ABS, ABS1, ABS2, ECM, ECM/TCM, IGN, LH HDLP, PREM AUDIO, RH HDLP, and RUN/CRANK
G103, G105, G107, and G109
G103, G105, and G109 - Late Production
Data Link Connector (DLC) Schematics
Data Link Connector (DLC) Schematics
Data Link Connector (DLC) Schematics
G101
Figure 2:

Engine Data Sensors-5 Volt and Low Reference Bussing


Object Number: 870203  Size: FS
Master Electrical Component List
Engine Control Module Description
Engine Data Sensors-Pressure and Temperature
Ground, MIL, Power, and Serial Data
OBD II Symbol Description Notice
Figure 3:

Engine Data Sensors-Pressure and Temperature


Object Number: 870204  Size: FS
Master Electrical Component List
Engine Control Module Description
Engine Data Sensors-HO2S
Engine Data Sensors-5 Volt and Low Reference Bussing
OBD II Symbol Description Notice
Fuel Level and Oil Pressure
Figure 4:

Engine Data Sensors-HO2S


Object Number: 870206  Size: FS
Master Electrical Component List
Engine Control Module Description
Ignition Controls
Engine Data Sensors-Pressure and Temperature
Fuse Block-Underhood Fuses: ERLS, and INJECTORS, BCM Fuses: AIR BAG, CRUISE, and EPS
OBD II Symbol Description Notice
Figure 5:

Ignition Controls


Object Number: 870208  Size: FS
Master Electrical Component List
Engine Control Module Description
Fuel Delivery
Engine Data Sensors-HO2S
OBD II Symbol Description Notice
Fuse Block-Underhood Fuses: ERLS, and INJECTORS, BCM Fuses: AIR BAG, CRUISE, and EPS
Fuse Block-Underhood Fuses: ABS, ABS1, ABS2, ECM, ECM/TCM, IGN, LH HDLP, PREM AUDIO, RH HDLP, and RUN/CRANK
Stop Lamp Switches
Engine Controls Schematic Icons
Engine Controls Schematic Icons
G103, G105, G107, and G109
G103, G105, and G109 - Late Production
Figure 6:

Fuel Delivery


Object Number: 870209  Size: FS
Master Electrical Component List
Engine Control Module Description
EVAP Controls and IAC
Ignition Controls
OBD II Symbol Description Notice
Fuse Block-Underhood Fuses: ERLS, and INJECTORS, BCM Fuses: AIR BAG, CRUISE, and EPS
Fuse Block-Underhood Fuses: IP BATT2 and RUN (IGN3), BCM Fuses: BCM ELECT, CLUSTER, FUELPUMP, HVAC, IGN. SW, and STOP
G301
G301
Figure 7:

EVAP Controls and IAC


Object Number: 870211  Size: FS
Master Electrical Component List
Engine Control Module Description
Controlled/Monitored Subsystem References
Fuel Delivery
OBD II Symbol Description Notice
Fuse Block-Underhood Fuses: ERLS, and INJECTORS, BCM Fuses: AIR BAG, CRUISE, and EPS
Figure 8:

Controlled/Monitored Subsystem References


Object Number: 870213  Size: FS
Master Electrical Component List
Engine Control Module Description
EVAP Controls and IAC
OBD II Symbol Description Notice
Fuel Level and Oil Pressure
Driver Controls
Stop Lamps
Engine Cooling Schematics
Air Recirculation and Compressor Controls-C60
Charging
Starting
Manual Transmission Schematics-M86 Getrag