2003 Buick Century REPAIR MANUAL -- HOW TO FIX YOUR CAR OR TRUCK

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2003 Buick Century CAR/TRUCK REPAIR PROCEDURES AND DIAGRAMS - WHAT Buick REPAIR SHOPS DON'T WANT YOU TO KNOW

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Get Full Access Automotix DIY provides automotive consumers and do it yourselfers; the most comprehensive repair information about 2003 Buick Century car and truck repair procedures including Buick engine diagrams, wiring diagrams, repair work estimating measures, technical service bulletins, auto body work guidance, starter & alternator replacement procedures, serpentine belt replacement procedures, radiator & hose replacement procedures, tune-up & drivability specifications, quick lube illustrations, preventive maintenance guide, engine light reset instructions, parts removal and install procedures, fuel filter replacement directions, component location diagrams, air filter locations & replacement instructions, a/c system specifications, and general auto service procedures. You don't have to be a car mechanic or technician to know how to fix your Buick Century automobile. Try the Automotix DIY solution today!
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Using the Automotix DIY repair procedures will save you hundreds and even thousands of dollars! In addition, it will save you hours of touring the city searching for Buick mechanics you can trust. The Automotix DIY solution is particularly affordable. A full access to the entire DIY repair procedures and diagrams for your 2003 Buick Century vehicle will cost less than a single gallon of gas. Here are some of the DIY repair tips and procedures you will find here:

A/C & HEATER SERVICE PROCEDURES FOR 2003 Buick Century AUTOMOBILES

Computer Relearn Procedures -> General Motors Corp. -> 1997-98 -> 1998-2000 -> 1998-99 -> 1999-2001 -> 1999-2002 -> 2.2L & 2.4L Engines -> 2000-02 -> 2000-04 -> 2001-02 -> 2001-04 -> 3.1L, 3.4L, 3800/3.8L, 4.0L & 4.6L Engines -> 3.5L Engine -> 5.7L Engine -> Achieva, Alero, Grand Am & Skylark -> Achieva, Cavalier, Skylark & Sunfire -> Alero & Grand Am -> Alero & Malibu -> Aurora -> Aurora, Bonneville, DeVille, LeSabre & Seville -> Aurora, Bonneville, Grand Prix, LeSabre & Park Avenue -> Auto Learn Passlock Procedure -> Body Control Module (BCM) -> Bonneville -> Bonneville, Eighty Eight, LeSabre, LSS & Park Avenue -> C & K Series w/Diesel Engine -> C & K Trucks w/Diesel Engine -> Camaro & Firebird -> Catera -> Cavalier & Sunfire -> Century -> Century, Grand Prix, Impala, Intrigue, Lumina, Monte Carlo & Regal -> Century, Impala, Intrigue, Monte Carlo & Regal -> Corvette -> Crankshaft Position System Variation Learn -> Cutlass & Malibu -> Dash Integration Module (DIM) -> DeVille -> DeVille, Eldorado & Seville -> EEPROM -> Eldorado -> Engine Control Module (ECM) -> Engine Performance -> Except Park Avenue -> Grand Am -> Grand Prix & Regal -> Impala & Monte Carlo -> Instrument Panel Integration Module (IPM) -> Intrigue -> LeSabre -> Less Tech 2 Or Techline Terminal -> Light Truck & Vans -> Park Avenue -> Passenger Cars -> Passkey Module -> Passlock Learn Procedure -> PCM -> Powertrain Control Module (PCM) -> Powertrain Control Module (PCM) & Vehicle Control Module (VCM) -> Rear Integration Module -> Riviera -> Seville -> T50/T60/T20+ -> TDC Offset Adjustment -> Theft Deterrent System Programming -> VCM -> With Tech 2 -> With Techline Terminal & Scan Tool
Vehicle: 2003 Buick Century 3.1 V6 GAS

Passenger Cars

Body Control Module (BCM)
Alero & Grand Am

This procedure must be performed if the BCM, Passlock sensor or PCM is replaced. If BCM is not properly programmed, it will not control all the features properly.

  • Ensure battery is fully charged and ignition switch is in the ON position.
  • Connect a suitably programmed Tech II, or equivalent, scan tool to Data Link Connector (DLC).
  • Access scan tool "Special Functions" menu and follow scan tool instructions to program BCM.
  • If BCM fails to accept the pr...

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BRAKE SERVICE PROCEDURES FOR 2003 Buick Century AUTOMOBILES

Hydraulic Brake Systems -> General Motors -> Diagnosis & Testing
Vehicle: 2003 Buick Century 3.1 V6 GAS

Refer to...

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FUEL FILTER REPLACEMENT PROCEDURES FOR 2003 Buick Century AUTOMOBILES

General Motors Corp./Saturn Passenger Cars -> Fuel Pressure Relief -> Except Aveo, LaCrosse, LeMans (1988-93), Malibu & Malibu Maxx (2004-05), Metro, Nova, Prizm, Spectrum & Storm -> Engine Fuel Pressure Service Port -> Engines Less Fuel Pressure Service Port
Vehicle: 2003 Buick Century Custom 3.1 V6 GAS

Do not smoke or allow an open flame of any type when working on or near any fuel system related components. The highly flammable vapor mixtures may ignite, resulting in serious personal injury.

Prior to disconnecting fuel lines, the fuel system pressure must be relieved to prevent accidental spray of fuel.

After the battery has been disconnected and reconnected, some abnormal driveability symptoms may occur. The vehicle may need to be driven while the vehicle relearns its adaptive strateg...

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DRIVELINE, U-JOINT & CV AXLES REPLACEMENT PROCEDURES FOR 2003 Buick Century AUTOMOBILES

CV AXLE SHAFT, Replace
Vehicle: 2003 Buick Century Limited 3.1 V6 GAS

To prevent personal injury and/or component damage, do not allow the weight of the vehicle to load the front wheels, or attempt to operate the vehicle, when the wheel drive shaft(s) or wheel drive shaft nut(s) are removed. To do so may cause the inner bearing race to separate, resulting in damage to brake and suspension components and loss of vehicle control.

Wheel drive shaft boots, seals and clamps should be protected from sharp objects any time service is performed on or near the wheel drive shaft(s). Damage to the boot(s), the seal(s) or the clamp(s) may cause lubrican...

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TIRE PRESSURE MONITORING SYSTEM PROCEDURES FOR 2003 Buick Century AUTOMOBILES

Diagnosis & Testing -> Accessing Diagnostic Trouble Codes -> Clearing Diagnostic Trouble Codes -> Diagnostic Tests -> Intermittent & Poor Connections -> Intermittents -> Poor Connections
Vehicle: 2003 Buick Century Custom 3.1 V6 GAS

Accessing Diagnostic Trouble Codes

Connect a suitably programmed scan tool to DLC (Data Link Connector) and follow manufacturer's instructions.

Diagnostic Tests

Refer to Figs. through for diagnostic test procedures.

Clearing Diagnostic Trouble Codes

Connect a suitably programmed scan tool to DLC (Data Link Connector), and follow manufacturer's instructions.

Intermittent & Poor Connections

Intermittents

Most intermittents are caused by faulty electrical connections or wiring. Inspect for the following:

  • Wiring broken inside insulation.
  • Poor connection between male and female terminal ...

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STARTER & ALTERNATOR REPLACEMENT PROCEDURES FOR 2003 Buick Century AUTOMOBILES

Alternator, Replace
Vehicle: 2003 Buick Century Limited 3.1 V6 GAS

  • Disconnect battery ground cable.
  • Rotate or lift belt tensioner arm, using a suitable tool to relieve tension from drive belt.
  • Remove drive belt.
  • Disconnect alternator electrical connectors and power steering line clip.
  • ...

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CABIN AIR FILTER LOCATIONS & REPLACEMENT PROCEDURES FOR 2003 Buick Century AUTOMOBILES

Cabin Air Filter Service -> General Motors Corp./Saturn -> 1997-2005 Century, Regal, 1998-2002 Intrigue & 2000-05 Impala & Monte Carlo
Vehicle: 2003 Buick Century Limited 3.1 V6 GAS

Under normal operating conditions the cabin air filter should be replaced every 15,000 miles. In dusty areas change the cabin air filter more often.

  • Place the windshield wipers in the up position by turning the ignition switch Off when the wipers reach the desired position.
  • Open the hood.
  • Lift the righthand side of the rear hood seal from the flange in the area of the rig...

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MAINTENANCE LAMP RESET PROCEDURES FOR 2003 Buick Century AUTOMOBILES

General Motors Corp./Saturn Cars -> Change Oil, Change Oil Now Or Change Oil Soon Lamp & Messages -> 2000-05 Century
Vehicle: 2003 Buick Century Custom 3.1 V6 GAS

To reset the Engine Oil Life monitor proceed as follows:

  • Turn ignition on, but do not start engine.
  • Fully depress and release accelerator pedal three times within five seconds. The oil life indicator will begin to flash indicating the system is resetting.
  • Turn ignition Off, then ...

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RADIATOR & HOSE REPLACEMENT PROCEDURES FOR 2003 Buick Century AUTOMOBILES

Coolant Hose, Replace -> Lower -> Upper
Vehicle: 2003 Buick Century Limited 3.1 V6 GAS

Lower

  • Drain cooling system into a suitable container.
  • Reposition hose clamp from water pump housing using hose clamp pliers J 38185 or equivalent.
  • Remove radiator outlet hose from water pump housing.
  • Remove lower radiator air deflector.
  • Reposition hose clamp from radiator using hose clamp pliers J 38185 or equivalent.
  • Remove radiator outlet hose from radiator and from vehicle.
  • Reverse procedu...

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SERPENTINE BELT SERVICE PROCEDURES FOR 2003 Buick Century AUTOMOBILES

Serpentine Drive Belt, Replace
Vehicle: 2003 Buick Century Custom 3.1 V6 GAS

  • Disconnect battery ground cable.
  • Rotate tensioner counterclockwise using suitable tool to remove ...

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COMPONENT LOCATION DIAGRAMS FOR 2003 Buick Century AUTOMOBILES

Component location diagrams for most 2003 Buick Century cars and light trucks sold in the U.S. from 1990+.

Right Hand Side Of Instrument Panel Compartment Diagram for 2003 Buick Century Limited 3.1 V6 GASRight Hand Side Of Instrument Panel Compartment Diagram for 2003 Buick Century Limited 3.1 V6 GAS

Components on diagram:
  • Instrument Panel Compartment Lamp Switch
  • Instrument Panel Fuse Block
  • Instrument Panel Compartment
  • Center Of Instrument Panel Diagram for 2003 Buick Century Custom 3.1 V6 GASCenter Of Instrument Panel Diagram for 2003 Buick Century Custom 3.1 V6 GAS

    Components on diagram:
  • Radio
  • Radio Connector
  • Radio Antenna Connector
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    WIRING DIAGRAMS FOR 2003 Buick Century AUTOMOBILES

    OEM drawn wiring diagrams for most 2003 Buick Century cars and light trucks sold in the U.S.

    2003 Buick Century Limited 3.1 V6 GAS Wiring Diagram2003 Buick Century Limited 3.1 V6 GAS Wiring Diagram

    Components on diagram:
  • Rear Window Defogger Relay
  • Rear Window Defogger Grid
  • HVAC Control Module
  • Defogger On Indicator
  • 2003 Buick Century  3.1 V6 GAS Wiring Diagram2003 Buick Century 3.1 V6 GAS Wiring Diagram

    Components on diagram:
  • Headlamp Switch
  • High Beam Indicator
  • Fog Lamp Relay
  • Fog Lamp Switch
  • Daytime Running Lamps Control Module
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    TECHNICAL SERVICE BULLETINS FOR 2003 Buick Century AUTOMOBILES

    OEM TSB listings for most 2003 Buick Century cars and light trucks sold in the U.S. from 1985+.

    Document: Revised General Motors New Vehicle Tire Warranty Program
    Vehicle: 2003 Buick Century Custom 3.1 V6 GAS

    Auto Systems:
  • Labor Times, Manuals, Warranty, Aids
  • Wheels, Tires, Wheel Bearings, Seals, Hubs
  • Document: New Website for AFIT, TPM, and VDR Updates
    Vehicle: 2003 Buick Century Custom 3.1 V6 GAS

    Auto Systems:
  • Labor Times, Manuals, Warranty, Aids
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    COMPONENT/PARTS SPECIFICATIONS FOR 2003 Buick Century AUTOMOBILES

    BRAKE SPECIFICATIONS: Brake drum, rotor, caliper, and related specifications for most 2003 Buick Century cars and light trucks sold in the U.S. and Canada from 1970+.

    • Brake caliper mounting bolt torque
    • Brake drum runout, machining, & discard specs
    • Minimum brake lining thickness.
    • Brake rotor runout, parallelism, machining, discard, & finish specs

    A/C SYSTEM SPECIFICATIONS: Air conditioning refrigerant capacity and type as well as lubricant capacity for most 2003 Buick Century cars and light trucks sold in the U.S. and Canada from 1980+.

    • Refrigerant capacity & type, compressor oil viscosity, total system oil capacity & compressor clutch gap

    COOLING SYSTEM BLEED: Cooling system bleeder valve identification, bleeder type and bleed procedures for most domestic and imported cars and light trucks sold in the U.S. and Canada from 1986+.

    PREVENTIVE MAINTENANCE: Preventive maintenance recommendations and required services for most domestic and imported cars and light trucks sold in the U.S. and Canada from 1980+. Includes severe and routine service schedules

    QUICK-LUBE and ILLUSTRATIONS: Fluid recommendations, capacities, drain plug torques, tire data, and severe service recommended preventive maintenance schedules. Information covers most 2003 Buick Century cars and light trucks sold in the U.S. and Canada from 1980+. Engine and chassis service images.

    • Automatic transmission/transaxles capacities, lubricant recommendations
    • Differential/final drive capacities, lube recommendations, grades, & viscosities
    • Final drive fill & drain plug torques
    • Number of lubrication fittings & plugs
    • Power steering, brake, & clutch fluid recommendations
    • Manual transmission/transaxle capacities, lube recommendations, grades, & viscosities
    • Number of lubrication fittings & plugs
    • Power steering, brake, & clutch fluid recommendations
    • Engine oil capacities, API grade recommendations, SAE viscosity recommendations, drain plug torque
    • Severe service maintenance & interval recommendations
    • Tire sizes, wheel nut/bolt torque, pressures & rim sizes
    • Transfer case capacities, lube recommendations, grades, & viscosities

    TUNE-UP & DRIVEABILITY SPECIFICATIONS: Most tune-up specifications for most 2003 Buick Century cars and light trucks sold in the U.S. and Canada from 1980+

    • Airflow sensor electrical specifications
    • Tensioning specifications for systems with automatic tensioners
    • Barometric pressure sensor specs
    • Battery group number and cranking performance
    • Crankshaft & camshaft position sensor resistance
    • Engine compression pressures
    • Coolant temperature sensor specs
    • Computer advance.
    • Diesel fuel temperature sensor resistance.
    • Distributor advance specifications
    • Ignition pickup coil resistance
    • Exhaust gas recirculation temperature sensor resistance
    • Engine fastener torque values
    • Firing order diagrams
    • Fuel system pressures
    • Generator (alternator) specs
    • Intake air temperature sensor specs
    • Ignition coil specifications
    • Fuel injector resistance
    • Engine idle speeds
    • Knock sensor resistance
    • Manifold absolute pressure sensor specs
    • Mixture control solenoid resistance
    • Voltage regulator specs
    • Spark plug applications & gaps
    • Starter motor electrical specs.
    • Tensioning specifications for systems without automatic tensioners
    • Throttle body temperature sensor resistance
    • Ignition timing in degrees at rpm
    • Transmission oil temperature sensor resistance
    • Throttle position sensor specs
    • Vacuum sensor valve specs

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