GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC K Sierra - 4WD 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Transfer Case Control Component Views
Figure 1:

Automatic Transfer Case (ATC) Control Module
Object Number: 310123 Size: MF
(1)Automatic Transfer Case (ATC) Control Module
(2)Left Bussed Electrical Center (LBEC) Connector
(3)Splice Pack 205 (SP205)
(4)Courtesy Lamp Socket
(5)Bulb
(6)Courtesy Lamp IP Bracket
(7)Left Bussed Electrical Center (LBEC)
(8)Automatic Transfer Case (ATC) Electrical Connector
(9)Automatic Transfer Case (ATC) Electrical Connector
Figure 2:

Automatic Transfer Case (ATC) Select Switch
Object Number: 349756 Size: MF
(1)Automatic Transfer Case (ATC) Select Switch
(2)Instrument Panel Switch and Deflector Housing
Figure 3:

Transfer Case Harness Routing (ATC)
Object Number: 310191 Size: LF
(1)Vehicle Speed Sensor (VSS) Connector
(1)Vehicle Speed Sensor (VSS) Connector
(2)Harness Bracket
(2)Harness Bracket
(3)VSS Connector
(4)Rear Propshaft Speed Sensor Connector
(5)Rear Propshaft Speed Sensor
(6)Automatic Transfer Case
(7)VSS
(8)Front Propshaft Speed Sensor
(9)Front Propshaft Speed Connector
(10)Left Frame Rail
(11)Encoder Motor Connector
(12)VSS Harness
(13)VSS Adapter Harness Connector
Figure 4:

Front Drive Axle Harness Routing (K25 Series)
Object Number: 310212 Size: LF
(1)Ground 110 (G110)
(2)Vent Tube
(3)Vent Tube Connection
(4)Front Axle Actuator/Switch
(5)Front Axle Actuator/Switch Connector
(6)Left Inner Fender
Figure 5:

Front Drive Axle Harness Routing (K15 Series)
Object Number: 310214 Size: LF
(1)Vent Tube
(2)Vent Tube Connection
(3)Front Axle Actuator/Switch
(4)Front Axle Actuator/Switch Connector
(5)Front Drive Axle Assembly (Mount)
(6)Ground 110 (G110)
(7)Left Inner Fender