GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2003 🢒 Sonoma Pickup - 4WD 🢒 Transmission/Transaxle 🢒 Automatic Transmission - 4L60-E/4L65-E 🢒 Transfer Case Control Component Views
Figure 1:

Body Harness to Cowl
Object Number: 357126 Size: LF
(1)Blower Motor Relay Connector
(2)Body Harness
(3)Windshield Wiper Motor Connector
(4)G117
(5)P100
(6)Cruise Control Module (CCM) Connector
(7)Underhood Lamp Connector
(8)Front Axle Vacuum Solenoid Connector
(9)S138
(10)Blower Motor Resistor Connector
(11)Not Used
(12)Blower Motor Connector (C42/C60), Blower Motor Control Module (C68)
(13)C101 (2.2 L)
(14)C101 (4.3 L)
(15)S121
(16)S113
(17)S118
Figure 2:

Front Axle Switch
Object Number: 203303 Size: LF
(1)Front Axle Indicator Switch
(2)Front Axle
Figure 3:

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

Center I/P Switches
Object Number: 1004323 Size: LF
(1)Instrument Panel (I/P)
(2)Transfer Case Shift Control Switch
(3)Inflatable Restraint I/P Module Switch (Pickup Only)
(4)Auxiliary Power Outlet - Right
(5)Auxiliary Power Outlet - Left
(6)I/P Tray, Ashtray and Cigar Lighter
(7)Rear Wiper/Washer Switch and Endgate/Liftglass Window Release Switch (Utility)
(8)Transfer Case Shift Control Switch C2
(9)Transfer Case Shift Control Switch C1
Figure 5:

Transfer Case Shift Control Module
Object Number: 203290 Size: LF
(1)Right Side Cowl Panel
(2)Transfer Case Shift Control Module Connector (Not Used on Selectable)
(3)Transfer Case Shift Control Module Connector
(4)Transfer Case Shift Control Module