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

4WD Selector Indicators


Object Number: 183901  Size: MF
(1)Convenience Center
(2)4WD Indicator Lamp
(3)Transfer Case Shift Illumination Lamp
Figure 2:

Transfer Case Switch and C120


Object Number: 583120  Size: MF
(1)Connector C120
(2)Vehicle Speed Sensor
(3)Transfer Case Synchronizer
(4)Transfer Case Housing
(5)Transfer Case Switch
(6)Engine Harness
Figure 3:

C100 and P100


Object Number: 634899  Size: MF
(1)Pass Through Grommet P100
(2)Connector C100
(3)Engine Harness
Figure 4:

Timer Logic and Relay Module


Object Number: 585146  Size: MF
(1)Timer Logic and Relay Module
Figure 5:

Front Axle Actuator Wiring


Object Number: 601510  Size: LF
(1)Transfer Case Harness
(2)Starter
(3)Battery Cable
(4)Front Differential
(5)Actuator Motor
(6)Actuator Connector
(7)Frame