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: 786201  Size: LF
(1)Electronic Brake Control Module (EBCM) Connector C1
(2)G117
(3)S117
(4)Body Wiring Harness
(5)S119
(6)Flash-to-Pass Relay
(7)Park Lamp Switch Relay
(8)S113
(9)S118
(10)S138
(11)C103
(12)Underhood Lamp Connector
(13)Front Axle Vacuum Solenoid
(14)Windshield Wiper Motor Connector
(15)S127, S122
(16)Electronic Brake Control Module (EBCM) Connector C3
(17)Brake Pressure Differential Switch
(18)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:

I/P Wiring Harness Composite View


Object Number: 785376  Size: LF
(1)Remote Control Door Lock Receiver (RCDLR) Connector
(2)Hazard Switch Connector
(3)Transfer Case Shift Control Switch Connectors  C2 and  C1
(4)Air Temperature Sensor - Upper
(5)Radio Connector
(6)HVAC Control Module Connector
(7)Speaker - LF Connector
(8)Ambient Light Sensor Connector
(9)I/P Compartment Lamp
(10)Inflatable Restraint I/P Module
(11)Instrument Panel
(12)S227
(13)C203
(14)C200
(15)Courtesy Lamp - Left Console
(16)C223
(17)S208, S272, S273, S274, S275, S287, S288
(18)SP203
(19)C224
(20)S283
(21)S205, S224, S225, S226
(22)Body Control Module Connector  C3
(23)Sunload Sensor Connector
(24)Courtesy Lamp - Right Console
(25)C217
(26)S230
(27)Door Jamb Switch - Driver
(28)Fuse Block - I/P
(29)Speaker - RF Connector
(30)I/P Dimmer Switch Connector
(31)Fog Lamp Switch - Rear
(32)Instrument Panel Cluster (IPC) Connector
(33)S223