GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2000 🢒 Century 🢒 Body and Accessories 🢒 Body Control System 🢒 Harness Routing Views
Figure 1:

LH Front of Vehicle Forward Lamp to Headlamp
Object Number: 305303 Size: LF
(1)C141 (Inline from Forward Lamp to LH Headlamp) Shown, C142/RH Similar
(2)LH Headlamp Applique Shown, RH Similar
Figure 2:

Engine Cooling Fans
Object Number: 581231 Size: LF
(1)C105 (Inline from Engine to Engine Cooling Harness)
Figure 3:

Battery Cable and Grounding Point
Object Number: 581299 Size: LF
(1)Battery
(2)Underhood Accessory Wiring Junction Block
(3)G100
Figure 4:

Top of Engine (RPO LG8)
Object Number: 374681 Size: LF
(1)C102 (Inline from Engine to Fuel Injector Harness)
(2)C108
Figure 5:

Engine (RPO LG8) ICM and ECT
Object Number: 581246 Size: LF
(1)Manifold Absolute Pressure (MAP) Sensor
(2)C110 (Inline form Engine to ICM Harness)
(3)C126 (Inline from Engine to ECT Harness)
(4)Fuel Injector 5
(5)Evaporative Emission (EVAP) Canister Purge Solenoid Valve
Figure 6:

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

Top Right of Engine -- RPO L36,L67
Object Number: 305310 Size: LF
(1)Ignition Coils
(2)Ignition Control Module (ICM)
(3)G111
(4)Ignition Control Module (ICM) Wiring Harness
Figure 8:

Engine (RPO L36/L67) Harness to Knock Sensor
Object Number: 581242 Size: LF
(1)Knock Sensor Connector
(2)C125 (Inline from Engine to Knock Sensor Harness)
(3)Knock Sensor
Figure 9:

Engine (RPO L67), near Starter
Object Number: 581303 Size: LF
(1)G113
(2)G117
(3)C171 (Inline from Engine to LF Wheel Speed Sensor)
(4)Starter Solenoid Connection
(5)Engine Oil Pressure Sensor
(6)Knock Sensor
(7)Positive Battery Connection to Starter
(8)Fusible Link (Engine)
Figure 10:

LF Wheel Speed Sensor
Object Number: 581253 Size: LF
(1)LF Wheel Speed Sensor
(2)C171 (Inline from Engine to LF Wheel Speed Sensor Harness)
Figure 11:

RF Wheel Speed Sensor
Object Number: 581251 Size: LF
(1)RF Wheel Speed Sensor
(2)C172 (Inline from Engine to RF Wheel Speed Sensor Harness)
Figure 12:

Engine (RPO LG8) Harness to AT and IP Routing Harness
Object Number: 581237 Size: LF
(1)C113 (Inline from Engine to AT Harness)
(2)C101 (Inline from Engine to IP Harness)
(3)G113
(4)G117
Figure 13:

Engine (RPO L67) Harness to AT and IP
Object Number: 581240 Size: LF
(1)C113 (Inline from Engine to AT Harness
(2)C101 (Inline from Engine to IP Harness)
Figure 14:

Left Side of Engine Compartment, Stud Tower
Object Number: 581232 Size: LF
(1)Cruise Control Module
(2)C101 (Inline from Engine to IP Harness)
Figure 15:

IP Harness Passthrough to Wiper Motor Space
Object Number: 581308 Size: LF
(1)P103
(2)Cruise Control Module
(3)Brake Level Sensor
Figure 16:

IP Harness Passthough to Engine Compartment
Object Number: 581306 Size: LF
(1)P100
Figure 17:

Left Side of IP Harness, Near Steering Column Routing View
Object Number: 581255 Size: LF
(1)C207 (Inline from IP to Ignition Key Switch)
(2)C205 (Inline from IP to Radio Control Switches/Steering Wheel)
(3)C216 (Inline from IP to Inflatable Restraint IP Module Jumper)
(4)C215 (Inline from IP to Inflatable Restraint Steering Wheel Module Jumper)
(5)C201 (Inline from IP to Steering Column Harness)
(6)G200
Figure 18:

Left side of Brake Pedal Ground Point
Object Number: 581304 Size: LF
(1)G203
Figure 19:

Upper Left IP Grounding Point
Object Number: 581311 Size: LF
(1)Sun Load Temperature Sensor
(2)G203
(3)DRL Ambient Light Sensor
Figure 20:

HVAC -- Behind Center of Instrument Panel (CJ2 Shown, C67 Similar)
Object Number: 305344 Size: LF
(1)Right Electric Actuator (w/ RPO CJ2 Only)
(2)Vacuum/Electric Solenoid
(3)Engine Vacuum Hose
(4)Blower Motor
(5)Blower Motor Control Module (w/ RPO CJ2) or Blower Resistors (w/ RPO C67)
(6)P100
(7)Heater-A/C Module
(8)Left Electric Actuator
Figure 21:

Right Side of IP Grounding Points
Object Number: 581309 Size: LF
(1)IP Fuse Block
(2)G200
(3)C201 (Inline from IP to Main Body Harness)
Figure 22:

Right Side of IP Pass-Through to Engine Compartment
Object Number: 581310 Size: LF
(1)Park Lamp Relay
(2)P100
(3)IP Fuse Block
Figure 23:

Right Side of IP Harness, near Inflatable Restraint IP Module
Object Number: 581256 Size: LF
(1)C216 (inline from IP to Inflatable Restraint IP Module Jumper
Figure 24:

IP Antenna Cable
Object Number: 581267 Size: LF
(1)Radio
(2)C290 (Inline Antenna Cable from IP to Main Body Harness)
Figure 25:

Cigar Lighter Jumper Harness View
Object Number: 329256 Size: LF
(1)C242 (Inline from IP to Ashtray Jumper)
Figure 26:

Center IP/AT Position Indicator Switch
Object Number: 329260 Size: LF
(1)C240 (Inline from IP to Center Floor Console Harness Routing)
Figure 27:

G301, C301, C303, C311, and C351 -- LH Side of Passenger Compartment
Object Number: 305354 Size: SF
(1)P371
(2)C351
(3)Park Brake Cable
(4)G301 (Body Ground)
(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:

Right Side of Main Body Harness, near RH Pillar A
Object Number: 581286 Size: LF
(1)P500
(2)C301 (Inline form Main Body to LF Door Harness)
Figure 30:

Left Side of Main Body Harness, Near LH Pillar A
Object Number: 581287 Size: LF
(1)P600
(2)C302 (Inline from Main Body to RF Door Harness)
Figure 31:

Cross Body Wiring
Object Number: 581283 Size: LF
(1)C311 (Inline from Main Body to Drivers Seat Harness)
(2)Inflatable Restraint Sensing and Diagnostic Module Connector
(3)Drivers Heated Seat Switch
(4)Passenger Heated Seat Switch
(5)C312 (Inline from Main Body to Passenger Seat Harness)
Figure 32:

LH Pillar B
Object Number: 581288 Size: LF
(1)P700 LH Shown, P800 RH Similar
(2)C351 (Inline from Main Body to LR Door Harness) LR Shown, RR C352 Similar
Figure 33:

Right Side Of Passenger Compartment (Sedan Shown) (Coupe Similar)
Object Number: 327680 Size: SF
(1)C405
(2)P372
Figure 34:

Left Side of Rear Package Shelf Grounding Point
Object Number: 581313 Size: LF
(1)C395 (Inline from Main Body to Antenna Amplifier)
(2)C399 (Inline Antenna Cable from Main Body to Antenna Amplifier)
(3)G402
(4)C390 (Inline from Main Body to Roof Harness)
(5)C398 (Inline from Main Body to Sunroof Harness)
(6)Rear Window Defogger Connector, C1
(7)C420 (Inline Main Body to Center High Mounted Stop Lamp)
Figure 35:

Left Side of Rear Package Shelf, Roof/Sunroof
Object Number: 581292 Size: LF
(1)C398 (Inline from Main Body to Sunroof Harness)
(2)Antenna Amplifier Connection to Rear Window Defogger (w/ RPO CF5)
(3)C420 (Inline from Main Body to Center High Mounted Stop Lamp (CHMSL) Jumper Routing View
(4)C399 (Inline Antenna Cable from Main Body to antenna Amplifier)
(5)C395 (Inline from Main Body to antenna Amplifier Jumper)
(6)C390 (Inline from Main Body to Roof Harness Routing View)
(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 (Inline Antenna Cable from Main Body to Antenna Amplifier)
(3)C402 (Inline from Main Body to RH Tail Lamp Harness)
(4)C410 (Inline from Main Body to Rear Compartment Lid Lock Release Solenoid Harness)
(5)C395 (Inline from Main Body to Power Antenna Amplifier)
(6)G402
Figure 37:

Right Side of Rear Compartment
Object Number: 581290 Size: LF
(1)RR Radio Speaker Connector
(2)P425
(3)Evaporative Emissions (EVAP) Canister Vent Solenoid Connector
(4)C402 (Inline from Main Body to RH Tail Lamp Harness)
Figure 38:

Rear Compartment Antenna Cable
Object Number: 581298 Size: LF
(1)C390 (Inline Antenna Cable from Main Body to Rear Antenna/MAST)
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 (Inline from Main Body to Rear Compartment Lid Harness)
(6)C915 (Inline from Rear Compartment Lid to Backup Lamp Applique)
Figure 40:

Rear Compartment Lid, Pass-Through to Backup Lamp Applique
Object Number: 581361 Size: LF
(1)C390 (Inline from Main Body to Backup Lamp Applique)
(2)P930
(3)Backup Lamp Applique