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

Transfer Case Harness Routing


Object Number: 899976  Size: LF
(1)C350
(2)Vehicle Speed Sensor (VSS) Connector
(3)Vehicle Speed Sensor (VSS)
(4)Transfer Case
(5)Transfer Case Encoder Motor
(6)Transfer Case Encoder Motor Connector
Figure 2:

Transfer Case Shift Control Module


Object Number: 886493  Size: MF
(1)I/P Harness
(2)Transfer Case Shift Control Module Connectors
(3)Transfer Case Shift Control Module
(4)Instrument Panel
Figure 3:

Transfer Case Shift Control Switch


Object Number: 770349  Size: MF
(1)Transfer Case Shift Control Switch
(2)Instrument Panel Switch and Deflector Housing
Figure 4:

Front Drive Axle Harness Routing


Object Number: 899977  Size: LF
(1)C150
(2)Frame
(3)Front Axle Actuator
(4)Front Axle Actuator Connector