GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2003 🢒 Century 🢒 Body and Accessories 🢒 Wiring Systems 🢒 Harness Routing Views
Figure 1:

LF of Vehicle Forward Lamp to Headlamp
Object Number: 305303 Size: LF
(1)Headlamp Assembly Connector - Left Shown, Right Similar
(2)Headlamp Assembly - Left Shown, Right Similar
Figure 2:

RF of the Vehicle
Object Number: 592187 Size: LF
(1)Right Front Frame Rail
(2)Horn Assembly
(3)C103
Figure 3:

Cooling Fans
Object Number: 859061 Size: LF
(1)Engine Wiring Harness
(2)C105
(3)Cooling Fan - Right Connector
(4)Cooling Fan Jumper Wiring Harness
(5)Cooling Fan - Left Connector
Figure 4:

Battery Cable and Grounding Point
Object Number: 581299 Size: LF
(1)Battery
(2)Fuse Block-Underhood
(3)G100
Figure 5:

Top of Engine (RPO LG8)
Object Number: 374681 Size: LF
(1)C102
(2)C108
Figure 6:

Engine (RPO L67) ICM and ECT
Object Number: 581234 Size: LF
(1)C110
(2)C126
Figure 7:

RF of the Engine Compartment (L36/L67)
Object Number: 1043757 Size: MF
(1)Camshaft Position (CMP) Sensor
(2)Ignition Control Module (ICM) Wiring Harness
(3)C110
(4)Ignition Control Module (ICM)
(5)Ignition Coils
(6)G111
(7)Ignition Control Module (ICM) Wiring Harness
(8)Ignition Control Module (ICM) Wiring Harness
(9)Crankshaft Position (CKP) Sensor
Figure 8:

Lower Rear of the Engine (L36/L67)
Object Number: 1043361 Size: MF
(1)Knock Sensor (KS) 2
(2)Knock Sensor (KS) 2 Connector
(3)Knock Sensor (KS) 2 Jumper Harness
(4)C125
Figure 9:

Lower Left Side of Engine (LG8)
Object Number: 822934 Size: MF
(1)A/C Compressor Clutch
(2)Crankshaft Position (CKP) Sensor A
(3)Knock Sensor (KS) 1
(4)Engine Oil Pressure (EOP) Switch
(5)Engine Wiring Harness
(6)Starter Lead
(7)Positive Battery Cable
Figure 10:

Lower Front of the Engine Components (L67)
Object Number: 925019 Size: MF
(1)Starter Solenoid B Terminal
(2)G113
(3)Battery Cable Wiring Harness
(4)Engine Wiring Harness
(5)Starter Solenoid S Terminal
(6)Engine Oil Level Sensor
(7)Knock Sensor (KS) 1
Figure 11:

Lower Front of the Engine Components (L36)
Object Number: 1036210 Size: MF
(1)Starter Solenoid B Terminal
(2)G113
(3)Battery Cable Wiring Harness
(4)Engine Wiring Harness
(5)Starter Solenoid S Terminal
(6)Engine Oil Level Sensor
(7)Knock Sensor (KS) 1
(8)Starter
Figure 12:

Left Side of Engine Compartment (LG8)
Object Number: 849492 Size: MF
(1)G111
(2)G113
(3)C113
(4)Electronic Brake Control Module (EBCM) Connector (JL9/JM4)
(5)C101
(6)A/C Refrigerant Pressure Sensor Connector
(7)Wheel Speed Sensor (WSS) - LF (JL9/JM4)
Figure 13:

Transmission (L36/L67)
Object Number: 1042171 Size: MF
(1)C113
(2)Electronic Brake Control Module (EBCM) Connector (JL9/JM4)
(3)C101
(4)Automatic Transmission
(5)Engine Wiring Harness
Figure 14:

LR of the Engine Compartment
Object Number: 1095521 Size: LF
(1)P103
(2)I/P Wiring Harness
(3)Cruise Control Module (CCM) Connector
(4)Cruise Control Module (CCM) (K34)
(5)Electronic Brake Control Module (EBCM) (JL9/JM4)
(6)Electronic Brake Control Module (EBCM) Connector (JL9/JM4)
(7)Engine Wiring Harness
(8)Brake Fluid Level Switch
(9)C101
(10)A/C Refrigerant Pressure Sensor
(11)Engine Wiring Harness
(12)G171 (JL9/JM4)
Figure 15:

IP Harness Passthrough to Engine Compartment
Object Number: 581306 Size: LF
(1)P100
Figure 16:

Left Side of IP Harness, Near Steering Column
Object Number: 581255 Size: LF
(1)C207
(2)C205
(3)C216
(4)C215
(5)C201
(6)G201
Figure 17:

Vehicle Fuel Tank
Object Number: 374824 Size: LF
(1)C405
Figure 18:

Upper Left of Instrument Panel
Object Number: 581311 Size: LF
(1)Sun Load Sensor
(2)G203
(3)Ambient Light Sensor
Figure 19:

Behind the Right Side of the I/P
Object Number: 1162362 Size: LF
(1)Vacuum Reservoir
(2)G200
(3)Fuse Block - I/P
(4)C200
(5)Blower Motor
(6)Blower Motor Resistor Assembly (CJ3)/Blower Motor Control Processor (CJ2)
(7)P100
(8)Vacuum Reservoir
(9)Black Vacuum Hose
(10)Air Temperature Actuator - Right
(11)Automatic Headlamp Relay
(12)Rear Compartment Lid Release Relay
(13)Rear Window Defogger Relay
(14)Retained Accessory Power (RAP) Relay
(15)I/P Wiring Harness
(16)Air Temperature Actuator - Left
Figure 20:

Behind Right Side of Instrument Panel
Object Number: 910278 Size: MF
(1)C206, Power Drop Connector
Figure 21:

Right Side of Instrument Panel - Front
Object Number: 581309 Size: LF
(1)Fuse Block - I/P
(2)G200
(3)C200
Figure 22:

Right Side of Instrument Panel - Rear
Object Number: 855481 Size: LF
(1)Park Lamp Relay
(2)Brake to Shift Relay
(3)P100
(4)Fuse Block-I/P
Figure 23:

LH Side of Inflatable Restraint IP Module
Object Number: 581256 Size: LF
(1)C216
Figure 24:

Antenna Cable
Object Number: 581267 Size: LF
(1)Radio
(2)C290
Figure 25:

Cigar Lighter Jumper Harness View
Object Number: 329256 Size: LF
(1)C242
Figure 26:

Center Console (D06, D55 - If Equipped)
Object Number: 822775 Size: LF
(1)Heated Seat Switch - Driver (KA1)
(2)Traction Control Switch (Regal)
(3)Heated Seat Switch - Passenger (KA1)
(4)Cigar Lighter
(5)Auxiliary Power Outlet (If Equipped)
(6)C240 (Regal), C241 (Century - If Equipped)
(7)I/P Wiring Harness
Figure 27:

LH Side of Passenger Compartment
Object Number: 305354 Size: SF
(1)P371
(2)C351
(3)Park Brake Cable
(4)G301
(5)C301
(6)C303
(7)C311
(8)Body Wiring Harness
Figure 28:

Right Side Floor of Passenger Compartment
Object Number: 329265 Size: LF
(1)C352
(2)P372
(3)C302
Figure 29:

Lower RH A Pillar
Object Number: 581286 Size: LF
(1)P500
(2)C301
Figure 30:

Lower LH A Pillar
Object Number: 581287 Size: LF
(1)P600
(2)C302
Figure 31:

Cross Body Wiring
Object Number: 581283 Size: LF
(1)C311
(2)Inflatable Restraint Sensing and Diagnostic Module Connector
(3)Heated Seat Switch - Driver
(4)Heated Seat Switch - Passenger
(5)C312
Figure 32:

LH Pillar B
Object Number: 581288 Size: LF
(1)P700 LH Shown, P800 RH Similar
(2)C351 LR Shown, RR C352 Similar
Figure 33:

Right Side Of Passenger Compartment
Object Number: 829131 Size: MF
(1)C405
(2)P372
Figure 34:

Left Side of Rear Window Shelf
Object Number: 885618 Size: MF
(1)Cellular Antenna Connector
(2)C404
(3)Body Wiring Harness
(4)C403
(5)Navigation Antenna Connector
Figure 35:

Left Side of Rear Package Shelf, Roof/Sunroof
Object Number: 581292 Size: LF
(1)C398
(2)Antenna Amplifier Connection to Rear Window Defogger (w/ RPO CF5)
(3)C420
(4)C399
(5)C395
(6)C390
(7)Rear Window Defogger Connector, C1
Figure 36:

Left Side of Rear Compartment
Object Number: 581289 Size: LF
(1)Rear Compartment Courtesy Lamp
(2)C399
(3)C402
(4)C410
(5)C395
(6)G402
Figure 37:

Right Side of Rear Compartment
Object Number: 581290 Size: LF
(1)Speaker Connector - RR
(2)P425
(3)Evaporative Emissions (EVAP) Canister Vent Solenoid Connector
(4)C402
Figure 38:

Rear Compartment Antenna Cable
Object Number: 581298 Size: LF
(1)C390
Figure 39:

Rear Compartment Lid
Object Number: 581296 Size: LF
(1)Rear Compartment Lid Ajar Switch Connector
(2)Rear Compartment Lid Lock Release Actuator Connector
(3)P932
(4)P430
(5)C410
(6)C915
Figure 40:

Rear of the Vehicle
Object Number: 1208573 Size: MF
(1)C915
(2)P915
(3)Backup Lamp Applique