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

Transfer Case Components


Object Number: 1568366  Size: LF
(1)Accessory Switch
(2)Transfer Case Shift Control Module
(3)Transfer Case Shift Control Module C3
(4)Transfer Case Shift Control Module C2
(5)Transfer Case Shift Control Module C1
Figure 2:

Engine Harness - Rear (MA5)


Object Number: 1550417  Size: LF
(1)Transmission Case
(2)Backup Lamp Switch
(3)Heated Oxygen Sensor (HO2S) 2
(4)Transfer Case Encoder Motor Connector
(5)Vehicle Speed Sensor (VSS) Connector
Figure 3:

Engine Harness - Rear (M30)


Object Number: 1550416  Size: LF
(1)Transmission Case
(2)C175 Engine Harness to Transmission Internal Harness
(3)Heated Oxygen Sensor (HO2S) 2
(4)Transfer Case Encoder Motor Connector
(5)Vehicle Speed Sensor (VSS) Connector
(6)Park / Neutral Position (PNP) Switch