GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 GMC Suburban - 4WD 🢒 Body and Accessories 🢒 Wiring Systems 🢒 Transfer Case Control Component Views
Figure 1:

Automatic 4WD Support Wiring
Object Number: 429318 Size: MF
(1)Automatic Transfer Case Control Module
(2)IP Harness
(3)Daytime Running Lights Control (DRL) Module
(4)Convenience Center
(5)IP Reinforcement Brace
Figure 2:

Transfer Case Switch (M30)
Object Number: 183946 Size: LF
(1)Heated Oxygen Sensor Connectors
(2)Vehicle Speed Sensor
(3)Transfer Case Switch
(4)Transfer Case
Figure 3:

Transfer Case Select Switch
Object Number: 183948 Size: LF
(1)Radio Connector
(2)Rear Wiper Switch
(3)Cargo Lamp Switch
(4)Rear Fan Switch
(5)Electric Shift Transfer Case Switch or Fog Lamp Switch
Figure 4:

Transfer Case Relay
Object Number: 183902 Size: MF
(1)Transfer Case Relay
(2)Front Axle Actuator
(3)Front Axle Switch
Figure 5:

C224 and C225
Object Number: 183911 Size: MF
(1)Cruise Control Module
(2)Pass Through Grommet P100
(3)Connector C100
(4)Connector C110
(5)Connector C104
(6)Connector C111
(7)Rear Lamp Harness
(8)Engine Harness
(9)Windshield Wiper Motor
(10)Connector C225
(11)Connector C224
Figure 6:

P100
Object Number: 183913 Size: MF
(1)Connector C102
(2)LH Front Headlamp Connectors (Composite)
(3)Park And Turn Lamp LH Front
(4)LH Fog Lamp Connector
(5)Horn
(6)Connector C101
(7)Ground G113
(8)Connector C100
(9)Pass Through Grommet P100
Figure 7:

6.5L Diesel Engine, RH Side
Object Number: 172401 Size: LF
(1)Engine Harness
(2)Generator Connector
(3)Turbo
(4)Grounds G150 And G105
(5)Ground G104