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

Ignition I Voltage and 12-Volt Reference


Object Number: 1851981  Size: FS
Master Electrical Component List
Power Mode Description and Operation
Control Module References
Ignition II/III Voltage
Figure 2:

Ignition II/III Voltage


Object Number: 1852094  Size: FS
Master Electrical Component List
Power Mode Description and Operation
Control Module References
Ignition III Voltage and Accessory Voltage
Ignition I Voltage and 12 Volt Reference
DLIS Fuse and Ignition Switch
RUN/CRANK BUS - AIRBAG IGN, MISC IGN and SEO/ALC Fuses
RUN/CRANK BUS - ECM-IGN and TRANS IGN 1 Fuses
RUN/CRANK BUS - AIRBAG IGN, MISC IGN and SEO/ALC Fuses
RUN/CRANK BUS - AIRBAG IGN, MISC IGN and SEO/ALC Fuses
RUN/CRANK BUS - AUX HVAC- IGN and HVAC-IGN Fuses
RUN/CRANK BUS - AUX HVAC- IGN and HVAC-IGN Fuses
RUN/CRANK BUS - ECM-IGN and TRANS IGN 1 Fuses
G106 (4.3L) and G103
G102, G107 (4.3L), G104, G108
Figure 3:

Ignition III Voltage and Accessory Voltage


Object Number: 1851970  Size: FS
Master Electrical Component List
Power Mode Description and Operation
Control Module References
Serial Data Communication Enable
Ignition II/III Voltage