GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2000 🢒 GMC K Pickup - 4WD 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Harness Routing Views
Figure 1:

Windshield Washer and Forward Lamp Harness
Object Number: 465195 Size: MF
(1)Forward Lamp Harness
(2)C116
(3)Windshield Washer Motor Wiring Harness
(4)Windshield Washer Motor, Front
(5)Windshield Washer Motor, Rear
(6)Windshield Washer Reservoir
(7)Battery, LH (Auxiliary/Diesel Only)
Figure 2:

7.4L Engine, C105, Rear View
Object Number: 276622 Size: MF
(1)C105
Figure 3:

Dual Generator Support Wiring
Object Number: 391542 Size: MF
(1)Generator, RH
(2)Generator Cable
(3)C115
(4)Generator, LH
(5)Generator Connector, LH
(6)Battery, LH
(7)Electronic Brake Control Module (EBCM)
Figure 4:

Engine Harness, Rear (Diesel)
Object Number: 465311 Size: MF
(1)C114
(2)C112
(3)C113
(4)Fuel Heater Connector
(5)Glow Plug Controller
(6)Glow Plug Wiring Harness, LH
(7)Engine Harness
(8)Glow Plug Controller Connector
(9)Water-In-Fuel Sensor Connector
Figure 5:

Connectors: C100, C103, C104, C131, C132, C140, C142
Object Number: 376148 Size: MF
(1)C132 (Automatic Transfer Case)/C140 (Selectable Transfer Case)
(2)C130
(3)C100
(4)C104 (IP Harness)
(5)C103 (Engine Harness)
(6)C104 (Taillamp Ext. Harness)
(7)C103 (Taillamp Ext. Harness)
(8)Taillamp Ext. Harness
(9)Engine Harness
(10)Trailer Wiring Harness
(11)C131 (Automatic Transfer Case)/C142 (Selectable Transfer Case)
(12)C132 (Automatic Transfer Case)/C140 (Selectable Transfer Case)
Figure 6:

Underhood Lamp
Object Number: 405594 Size: MF
(1)Underhood Lamp
(2)G108
(3)Underhood Lamp Connector
(4)Engine Harness
(5)P101
Figure 7:

Underhood Fuse Block and Wiring (CNG)
Object Number: 465351 Size: MF
(1)C119
(2)C117
(3)C118
(4)ABS Wiring Harness
(5)Engine Wiring Harness
(6)C103
(7)C130
(8)C100
(9)C106
(10)Underhood Fuse Block
Figure 8:

Connectors: C107, C120 (4L80E w/S4WD)
Object Number: 276630 Size: MF
(1)C107
(2)C120
Figure 9:

Connectors: C107, C120 (5-Speed Manual)
Object Number: 276778 Size: MF
(1)C120
(2)C107
Figure 10:

4L60-E, C122
Object Number: 276758 Size: MF
(1)C122
(2)C107
Figure 11:

Crossbody Harness, Driver Side Dash Area
Object Number: 276799 Size: MF
(1)S266
(2)S256
(3)S255
(4)D203
(5)S258
(6)C231
(7)Crossbody Harness
(8)S257
(9)Radio Amplifier Relay
(10)S259
(11)S260
(12)S261
(13)Audio Amplifier
(14)C232
(15)C210
(16)C298
(17)S251
(18)IP Harness
Figure 12:

Convenience Center, C205, C210, C218, C221
Object Number: 276793 Size: MF
(1)C210
(2)C218
(3)C221
(4)C205
(5)IP Wiring Harness
(6)C280
(7)Convenience Center
Figure 13:

Connectors: C221, C222, C301,C302 (Crossbody to Front to Rear Body Harness)
Object Number: 277003 Size: MF
(1)C222
(2)C221
(3)C302
(4)C301
Figure 14:

Connector: C203 (Convenience Center)
Object Number: 276796 Size: MF
(1)C223
Figure 15:

IP Wiring, Tranfer Case Shift Control Module
Object Number: 276795 Size: MF
(1)DRL Module
(2)C298
(3)C233
(4)C100
(5)IP Harness
(6)Steering Column Harness and C266
(7)C271
(8)Transfer Case Shift Control Module, Connector C1
(9)Transfer Case Shift Control Module, Connector C2
(10)Transfer Case Shift Control Module
Figure 16:

Connectors: C227, C233, C266 (IP Left Side)
Object Number: 276933 Size: MF
(1)C227
(2)C266
(3)C234
Figure 17:

Connectors: C200, C204, C299 (Right Side, Gas)
Object Number: 276910 Size: MF
(1)Passenger IP Inflation Module Connector
(2)C203
(3)C200
(4)C299
Figure 18:

Connectors: C200, C204, C230, C299 (IP Wiring Right Side, Diesel)
Object Number: 276797 Size: MF
(1)IP Harness
(2)Low Level Coolant Level Module
(3)C200
(4)IP Compartment Box Light Connector
(5)C204
(6)C230
(7)Courtesy Lamp, RF
(8)Vehicle Speed Sensor Buffer (VSSB)
(9)Powertrain Control Module (PCM)
(10)C299
(11)Door Jamb Switch and Connector, RF
Figure 19:

Heater and A/C Wiring, C203, G202
Object Number: 277642 Size: MF
(1)G202
(2)C203
Figure 20:

Connectors: C300, C307 (Overhead Console)
Object Number: 375523 Size: MF
(1)Front-to-Rear Body Harness
(2)C307
(3)Dome Lamp Connector, Front
(4)Auxiliary HVAC Control Module Harness
(5)Dome Lamp Connector, Front
(6)Dome Lamp Harness
(7)Garage Door Lamp Switch
(8)Auxiliary HVAC Control Module Connector, Front
(9)Overhead Console Harness
Figure 21:

Overhead Console Wiring Harness (Luxury)
Object Number: 466340 Size: MF
(1)Auxiliary HVAC Control Module Connector, Rear
(2)Auxiliary HVAC Control Module Switch, Rear
(3)Dome Lamp Connector, Rear
(4)C306
(5)Auxiliary HVAC Control Module Switch, Front
(6)Overhead Console
(7)C307
(8)Auxiliary HVAC Control Module Connector, Front
(9)C309
Figure 22:

Center Floor Console Harness (Luxury)
Object Number: 311404 Size: MF
(1)C304
(2)Console Harness
(3)Crossbody Harness
(4)IP Harness
(5)C305
Figure 23:

Power Seat Wiring Harness Connectors
Object Number: 277165 Size: MF
(1)C236 (Left)/C237 (Right)
(2)C212 (Left)/C229 (Right)
(3)C211 (Left)/C228 (Left)
Figure 24:

Rear Seat Harness (Luxury)
Object Number: 311436 Size: MF
(1)C311
(2)Floor
(3)Crossbody Harness
(5)C310
(6)Seat Belt Harness Connector
Figure 25:

Front Door Wiring
Object Number: 375317 Size: MF
(1)Speaker Connector, Tweeter
(2)Rear Window Lockout Switch Connector
(3)Power Window Switch
(4)Courtesy Light Connector
(5)Door Lock Switch Connector
(6)Power Window Switch Connector
(7)Power Mirror Switch Connector
(8)Speaker Connector
(9)Power Window Motor Connector
(10)C206 (Left)/C214 (Right)
(11)C209 (Left)
(12)C208 (Left)/C214 (Right)
(13)C207 (Left)/C213 (Right)
(14)Crossbody Harness
(15)P600 (Right Front)/P500 (Left)
(16)Door Harness
(17)C601 (Right)/C501 (Left)
(18)Door Lock Connector (Keyless Entry)
Figure 26:

Rear Door Wiring
Object Number: 277129 Size: MF
(1)Power Door Lock Motor Connector
(2)Courtesy Lamp, Door Connector
(3)Speaker, Rear Door
(4)Speaker Connector
(5)Power Window Motor Connector
(6)C496 (Right)/C498 (Left)
(7)Crossbody Harness
(8)C497 (Right)/C499 (Left)
(9)P800 (Right)/P700 (Left)
(10)Power Window Switch Connector
(11)Door Wiring Harness
Figure 27:

Center High Mounted Stop and Cargo Lamp Wiring, C410, C411 (except Suburban/Utility)
Object Number: 277211 Size: MF
(1)C411
(2)C410
Figure 28:

Rear Body Harness
Object Number: 372228 Size: MF
(1)CHMSL Connector
(2)C402
(3)C303
(4)Speaker Connector, LR
(5)Front to Rear Body Harness
(6)C314 (Liftgate)
(7)C405 (Cargo Doors)
(8)C406 (Liftgate)
(9)Speaker Connector, RR
(10)C406 (Cargo Doors)
(11)Door Lock Switch Connector, Rear
(12)Door Lock Actuator Connector, Rear
(13)G400
(14)Auxiliary Power Connector, Rear
(15)Door Jamb Switch Connector, Rear (Liftgate)
(16)C406 (Cargo Doors)
(17)Door Jamb Switch Connector, RR (Cargo Doors)
Figure 29:

Auxiliary A/C Wiring
Object Number: 277976 Size: MF
(1)Auxiliary HVAC Blower Relays; Low/Meduim/High
(2)C401
(3)C400
(4)Auxiliary Blower Motor
(5)Auxiliary Blower Resistor
(6)Auxiliary Temperature Door Motor
(7)Auxiliary Mode Door Motor
Figure 30:

Endgate Marker Lamps
Object Number: 375553 Size: MF
(1)C408
(2)Endgate Marker Lamps
Figure 31:

Tail and Stoplamp Harness Connectors
Object Number: 375538 Size: MF
(1)Tail/Stop Lamp Extension Harness
(2)Tail/Stop Lamp Harness
(3)Tail/Stop Lamp Connector, RH
(4)License Plate Lamp Harness
(5)License Plate Lamps
(6)C409
(7)C407
Figure 32:

Liftgate Release Motor Wiring
Object Number: 277193 Size: MF
(1)C406
(2)C404
(3)Liftgate Release Motor
(4)P410
(5)C450
(6)P409
(7)C314
(8)C402
Figure 33:

Rear Window Wiring Harness
Object Number: 277220 Size: MF
(1)Rear Window Wiper Motor and Connector
(2)P400
(3)Rear Window Defogger Connector, Right
(4)Rear Window Defogger Connector, Left