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

Power and Ground


Object Number: 669635  Size: FS
Master Electrical Component List
Transfer Case Description and Operation
Speed Sensors
B+ Bus Bar
Ign ACC, RUN and RAP Bus Bar
SP201 (4.3L)
G204 and G205 (Envoy)
w/o Trip Computer
G103 and G105 (4.3 L)
G103 and G105 (4.3 L)
G103 and G105 (4.3 L)
G103 and G105 (4.3 L)
Figure 2:

Speed Sensors


Object Number: 669637  Size: FS
Master Electrical Component List
Transfer Case Description and Operation
Power and Ground
G104 and G117
G104 and G117