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

Front Axle Indicator Switch


Object Number: 615187  Size: LF
(1)Body Harness
(2)C114
(3)Front Axle Indicator Switch
(4)Front Axle
Figure 2:

Body Harness, Bulkhead


Object Number: 610434  Size: LF
(1)Electronic Brake Control Module (EBCM) Connector C1
(2)G117
(3)S117
(4)S116
(5)S119
(6)Flash-to-Pass Relay
(7)Park Lamp Switch Relay
(8)S113
(9)S118
(10)S138
(11)C103
(12)Windshield Wiper Motor Connector
(13)S127, S122
(14)Electronic Brake Control Module (EBCM) Connector C3
(15)Brake Pressure Differential Switch
(16)Cruise Control Module (CCM) Connector
Figure 3:

Transfer Case (NP8) Harness Routing View


Object Number: 580984  Size: LF
(1)C116, C2 - M50 Only
(2)Active Transfer Case Harness
(3)Propshaft Speed Sensor - Rear
(4)Transfer Case Encoder Motor, C2
(5)Transfer Case Encoder Motor, C1
(6)Vehicle Speed Sensor (VSS)
(7)Transfer Case (NP8)
(8)Propshaft Speed Sensor - Front
(9)S134
(10)C116, C2 - M30 Only
Figure 4:

Transfer Case Shift Control Module


Object Number: 371196  Size: LF
(1)Left Side Cowl Panel
(2)Transfer Case Shift Control Module Connector C2
(3)Transfer Case Shift Control Module Connector C1
(4)Transfer Case Shift Control Module
Figure 5:

IP Wiring Harness Composite View


Object Number: 406299  Size: LF
(1)Remote Control Door Lock Receiver (RCDLR)
(2)Instrument Panel Cluster (IPC) Connector
(3)I/P Dimmer Switch Connector
(4)Speaker - RF Connector
(5)Fuse Block - I/P
(6)Door Jamb Switch - Driver
(7)C217
(8)Courtesy Lamp - Right Console
(9)Sunload Sensor
(10)Body Control Module Connector C3
(11)C224
(12)C223
(13)Courtesy Lamp - Left Console
(14)C200
(15)C203
(16)Instrument Panel Cluster (IPC)
(17)I/P Compartment Lamp
(18)C201
(19)Headlamp Ambient Light Sensor Connector
(20)Speaker - LF Connector
(21)HVAC Control Module Connector
(22)Radio Connector
(23)Air Temperature Sensor Assembly - Inside Connector, Distribution Duct
(24)Transfer Case Shift Control Switch Connectors C2 and C1
(25)Hazard Switch Connector