GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 Century 🢒 Engine 🢒 Engine Electrical 🢒 Harness Routing Views
Figure 1:

Right Rear of Engine (VIN M)
Object Number: 374681 Size: LF
(1)C102
(2)C108
Figure 2:

Front of Engine Compartment (VIN M)
Object Number: 374604 Size: LF
(1)C105
(2)RH Engine Coolant Fan Motor
(2)RH Engine Coolant Fan Motor Connector
(3)LH Engine Coolant Fan Motor
Figure 3:

Front of Engine Compartment (VIN 1, K)
Object Number: 374607 Size: LF
(1)RH Engine Coolant Fan Motor and Connector
(2)C105
(3)LH Engine Coolant Fan Motor
Figure 4:

Left Rear of Engine Compartment
Object Number: 388946 Size: LF
(1)C101(Instrument Panel Wiring Harness
(2)C101 (Engine Wiring Harnenss
(3)Cruise Control Module
Figure 5:

Right Front Side of Engine (w/RPO L36,L67)
Object Number: 305312 Size: LF
(1)C110
(2)Ignition Control Module (ICM) Wiring Harness
(3)Ignition Control Module (ICM)
(4)Crankshaft Position (CKP) Sensor
Figure 6:

Left Side Of Transmission
Object Number: 327378 Size: LF
(1)Park/Neutral Position Switch
(2)Park/Neutral Position Switch, C1
(3)Park/Neutral Position Switch, C2
(4)Engine Wiring Harness
(5)C111 (Inline to Automatic Tranaxle From Engine Wiring Harness)
Figure 7:

Transaxle Range Switch -- LH Side of Engine (VIN 1, K)
Object Number: 305322 Size: LF
(1)Automatic Transaxle Connector C113
(2)Transaxle Range Switch
(3)Transaxle Range Switch C1
(4)Transaxle Range Switch C2
Figure 8:

Front Of Vehicle
Object Number: 329508 Size: LF
(1)G101
(2)C141
(3)Fog Lamp Connector (LH)
(4)Ambient Air Temperature Gauge Sensor
(5)Fog Lamp Connector (RH)
(6)Horn Connector
(7)C120
(8)Underhood Accessory Wiring Junction Block C3
(9)C142
Figure 9:

Lower Rear Side of Engine (w/RPO L36,L67)
Object Number: 305317 Size: LF
(1)Knock Sensor (KS) Bank 2
(2)Knock Sensor (KS) Bank 2 -- Wiring Harness
(3)C125
Figure 10:

Top Front of Engine
Object Number: 305311 Size: LF
(1)Manifold Absolute Pressure (MAP) Sensor
(2)C110
(3)C126
(4)Fuel Injector 5 Connector
(5)Engine Wiring Harness
(6)Evaporative Emissions (EVAP) Canister Purge Solenoid Valve
(7)Fuel Injector 3
(8)Fuel Injector 1
(9)Ignition Control Module (ICM) Wiring Harness
Figure 11:

Left Front of Vehicle
Object Number: 305303 Size: LF
(1)Headlamp-Left Connector
(2)Headlamp-Left Assembly
Figure 12:

Front Wheel Speed Sensor
Object Number: 374829 Size: LF
(1)C171 (LH Shown), C172 (RH SImilar)
(2)Forward Lamp Wiring Harness
(3)Front Wheel Speed Sensor Connector
(4)Front Wheel Speed Sensor
Figure 13:

Right Front Wheel
Object Number: 374830 Size: LF
(1)RF Wheel Speed Sensor Connector
(2)Wheel Speed Sensor
(3)C172
Figure 14:

C200, C204 and Relays Behind Right Side of Instrument Panel
Object Number: 305348 Size: LF
(1)Instrument Panel Wiring Harness
(2)Cross Car Bdam Underside
(3)G200 (SIR and Instrument Panel Grounds)
(4)C200
(5)C204
(6)Relays (Accessory Delay Time (RAP) and Rear Window Defogger Relays Shown, All Others Not Used)
Figure 15:

Steering Column
Object Number: 329250 Size: LF
(1)C201
(2)C215
(3)C205
(4)C207
Figure 16:

Behind RH Side of Instrument Panel
Object Number: 329660 Size: LF
(1)G200
(2)C200
(3)Door Lock Relay
(4)Accessory Time Delay (RAP) Relay
(5)Rear Window Defogger Relay
(6)Rear Compartment Lid Release Relay
(7)Cross Car Beam (Underside)
(8)Instrument Panel Wiring Panel
Figure 17:

Instrument Panel
Object Number: 305347 Size: LF
(1)C216 (Instrument Panel In-Line to Inflatable Restraint Instrument Panel Module)
(2)Inflatable Restraint Instrument Panel Module
(3)Instrument Panel Wiring Harness
Figure 18:

Below Center Console (Regal)
Object Number: 329260 Size: LF
(1)C240
Figure 19:

Center Of Instrument Panel (Century)
Object Number: 329256 Size: LF
(1)C242
Figure 20:

Radio/Cellular Communication
Object Number: 329656 Size: LF
(1)Radio
(2)C252
(3)C250
(4)Cellular Communication Jumper Harness
Figure 21:

Radio -- Center of Instrument Panel
Object Number: 305327 Size: SH
(1)Radio
(2)Antenna Lead
(3)C290
Figure 22:

Floor of Passenger Compartment
Object Number: 329267 Size: LF
(1)C301
(2)G301
(3)C311
(4)Seat Heater Switch (Driver)
(5)Seat Heater Switch (Passenger)
(6)P371
(7)C351
Figure 23:

Right Side Floor of Passenger Compartment
Object Number: 329265 Size: LF
(1)C352
(2)P372
(3)C302
Figure 24:

C311 and C312 -- Floor Pan Under LF and RF Seats
Object Number: 332523 Size: LF
(1)C312 (w/ RPO AG2)
(2)C311
(3)Main Body Harness
Figure 25:

C371, C372 -- Below Rear of Vehicle (RH Similar)
Object Number: 305374 Size: SF
(1)C371 LH/C372 RH
(2)P371 LH/P372 RH
Figure 26:

Right Side Of Rear Compartment
Object Number: 329289 Size: LF
(1)C390
(2)C399 (w/ Mast Antenna)
(3)C402
(4)C410
(5)G402
(6)C399 (w/ Rear Window Antenna)
Figure 27:

Right Side C Pillar
Object Number: 327683 Size: SF
(1)C390
(2)C399
(3)C395
Figure 28:

Roof
Object Number: 305352 Size: LF
(1)C398 (Sun Roof In-Line to Body Wiring Harness)
(2)Body Wiring Harness
(3)Sun Roof Actuator and Sun Roof (Express Open) Module
(4)Sun Roof Module
(5)Sun Roof Switch Connector
Figure 29:

Rear of Vehicle
Object Number: 329682 Size: LF
(1)C401 (LH Shown, C402 (RH Similar)
(2)Tail/Stop/Turn Signal Lamp
(3)P401 (LH Shown), P402 (RH Similar)
Figure 30:

Right Side Of Passenger Compartment (Sedan Shown) (Coupe Similar)
Object Number: 327680 Size: SF
(1)C405
(2)P372
Figure 31:

Inside Rear Compartment
Object Number: 329296 Size: LF
(1)C915
(2)P932
(3)P430
(4)C410
Figure 32:

Inside Rear Compartment
Object Number: 327685 Size: LF
(1)C420
Figure 33:

Rear of Vehicle
Object Number: 329302 Size: LF
(1)C915
(2)P915
Figure 34:

RH Side of Engine Compartment
Object Number: 305304 Size: LF
(1)Battery
(2)Underhood Accessory Wiring Junction Block
(3)G100 Battery Ground
(4)Positive Battery Terminal
Figure 35:

Steering Column
Object Number: 329250 Size: LF
(1)C201
(2)C215
(3)C205
(4)C207
Figure 36:

A/C Compressor -- Lower Right Front of Engine
Object Number: 327373 Size: LF
(1)Crankshaft Position (24X) Sensor
(2)Bank 1 Knock Sensor (KS)
(3)Engine Oil Pressure Indicator Switch
(4)Fusible Links
(5)A/C Compressure Clutch Coil
Figure 37:

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 38:

Starter -- Lower Front of Engine Compartment
Object Number: 305308 Size: LF
(1)Positive Battery Cable
(2)G113/G117 Engine Grounds
(3)Starter Assembly
(4)Engine Oil Level Indicator Switch
(5)Knock Sensor (Bank 1)
Figure 39:

G203 -- Behind LH Side of Instrument Panel
Object Number: 305333 Size: LF
(1)Instrument Panel Wiring Harness
(2)Brake Pedal Bracket
(3)G203 (Radio and Instrument Panel Electronic Grounds)
Figure 40:

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 41:

Left Side of Package Shelf
Object Number: 305358 Size: LF
(1)Body Wiring Harness
(2)Defogger Grid-Rear Window Ground Wire
(3)Package Shelf
(4)G401
Figure 42:

Right Side Of Rear Compartment
Object Number: 329289 Size: LF
(1)C390
(2)C399 (w/ Mast Antenna)
(3)C402
(4)C410
(5)G402
(6)C399 (w/ Rear Window Antenna)
Figure 43:

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 44:

Windshield Wiper Motor -- Base of Windshield
Object Number: 305325 Size: LF
(1)Windshield Wiper Motor
(2)P103
(3)P101
Figure 45:

Left Side Of Rear Compartment
Object Number: 329291 Size: LF
(1)G401 (LH Rear Shelf Ground)
(2)P425/Evaporative Emission (EVAP) Canister Vent Solenoid Valve Connector
(3)C401
Figure 46:

Left Front Door
Object Number: 388991 Size: LF
(1)P500
(2)Window Regulator Motor Connector
(3)Window Regulator Motor