Buick Century Limited 1998 - 1998 GENERAL MOTORS Century, Intrigue & Regal

Buick Century Limited 1998 - BUZZERS, RELAYS & TIMERS

Buick Century Limited 1998 BUZZERS, RELAYS & TIMERS

Component	Component Location
A/C CLU Relay	In underhood electrical center.
Air Pump Relay	In underhood electrical center.
Accessory Time Delay (RAP) Relay (Buick)	Behind right side of dash, mounted to underside of cross car beam. See Fig. 1 .
Blower Motor Relay (Buick)	Integral with blower motor resistor.
Cooling Fan Motor Relays (1, 2, 3)	In underhood electrical center.
Crank Relay	In underhood electrical center.
Door Lock Relay	Behind dash, mounted to cross car beam.
Electronic Brake Control Relay	Below left side of dash, mounted to multi-purpose bracket. See Fig. 1 .
F/PMP Relay	In underhood electrical center.
F/PMP SPD CONT Relay	In underhood electrical center.
Fog Lamp Relay	In underhood electrical center.
Fuel Tank Filler Door Lock Relay (Oldsmobile)	Behind dash, attached to cross car beam.
Hazard Lamp & Turn Signal Lamp Flasher (Buick)	Below left side of dash, mounted on multi-purpose bracket, near BCM. See Fig. 1 .
Horn Relay	In underhood electrical center.
IGN Main Relay	In underhood electrical center.
Rear Compartment Lid Release Relay (Buick)	Behind right side of dash, mounted on underside of cross car beam See Fig. 1 .
Rear Compartment Lid Release Relay (Oldsmobile)	Part of rear compartment lid lock.
Rear Window Defogger Relay	Behind right side of dash, mounted on underside of cross car beam See Fig. 1 .

Buick Century Limited 1998 - CIRCUIT PROTECTION DEVICES

Buick Century Limited 1998 CIRCUIT PROTECTION DEVICES

Component	Component Location
Circuit Breakers	In fuse block.
Fuse Block	Behind right side of dash, in right door opening. See Fig. 1 .
Fusible Links	Left side of engine, on starter assembly.
Underhood (U/H) Electrical Center	Mounted to right strut tower. See Fig. 1 .

Buick Century Limited 1998 - CONTROL UNITS

Buick Century Limited 1998 CONTROL UNIT

Component	Component Location
Automatic Transaxle Control (BTSI) (Buick)	Center of console. See Fig. 1 .
Blower Motor Control Module	In right side of heater-A/C module. See Fig. 1 .
Body Control Module (BCM)	Behind left side of dash, left of steering column. See Fig. 1 .
Cruise Control Module	Front of left strut tower. See Fig. 1 .
Daytime Running Lamps (DRL) Control Module	Behind left side of dash. See Fig. 1 .
Driver Seat Heater Control Module (Buick)	Below right side of driver seat, mounted on seat track. See Fig. 1 .
Electronic Brake Control Module/ Electronic Brake Traction Control Module (EBCM/EBTCM)	Below left side of dash, left of steering column. See Fig. 1 .
Engine Coolant Level Indicator Module	Mounted on right side of radiator.
Ignition Control Module (3.8L VIN K & VIN 1)	Top front of engine. See Fig. 4 .
Ignition Control Module (3.1L VIN M) (Buick)	Top right side of engine.
Inflatable Restraint Sensing & Diagnostic Module	Below carpet, under right front seat. See Fig. 1 .
Mobile Telephone Amplifier (Buick)	Mounted to underside of rear package shelf. See Fig. 1 .
Mobile Telephone Transceiver (Buick)	Under rear of console.
Passenger Seat Heater Control Module (Buick)	Under right side front seat, on seat track. See Fig. 1 .
Powertrain Control Module (PCM)	Left front side of engine compartment, in air cleaner assembly. See Fig. 1 .
Radio Antenna Module	Above headliner, rear windshield area. See Fig. 1 .
Remote Control Door Lock Receiver (RCDLR)	Left side of dash, on right side of instrument cluster. See Fig. 1 .
Sun Roof (Express Open) Module	Right corner of sun roof. See Fig. 1 .

Buick Century Limited 1998 - MOTORS

Buick Century Limited 1998 MOTORS

Component	Component Location
Automatic Transmission Shift Lock Actuator (BTSI) (Buick)	Mounted on underside of steering column.
Automatic Transmission Shift Lock Control Actuator (BTSI) (Oldsmobile)	Inside floor console, mounted to shifter.
Blower Motor	Behind right side of dash, in heater-A/C module.
Brake Modulator (ABS)	Left side of engine, compartment, mounted on master cylinder.
Brake Motor (ABS)	Part of brake modulator, mounted on master cylinder.
Door Lock (Ajar Indicator Switch & Actuator Motor)	In each door.
Electric Actuator (Left Hand)	On left side of heater-A/C module.
Electric Actuator (Right Hand)	On right side of heater-A/C module.
Engine Coolant Fan Motor (Left)	On left side of radiator.
Engine Coolant Fan Motor (Right)	On right side of radiator.
Fuel Tank Filler Door Lock Actuator (Oldsmobile)	On left side of rear compartment, behind left wheelhouse.
Rear Compartment Lid Lock Release Actuator	On rear compartment lid, near latch.
Steering Gear (MSVA Actuator)	Left rear of engine compartment, behind transaxle.
Sun Roof Actuator	Center rear of sun roof module.
Windshield Washer Pump	On right front corner of engine compartment, in washer fluid reservoir.
Windshield Wiper Motor	On left side of firewall.

Buick Century Limited 1998 - SENDING UNITS & SENSORS

Buick Century Limited 1998 SENDING UNITS & SENSORS

Component	Component Location
A/C Refrigerant Pressure Sensor (Buick)	On left side of engine compartment, on accumulator.
A/C Refrigerant Pressure Sensor (Oldsmobile)	On right side of engine compartment, on accumulator.
Ambient Air Temperature Gauge Sensor	Behind front panel, mounted to radiator air baffle.
Automatic Transaxle Fluid Temperature (TFT) Sensor	In automatic transaxle.
Automatic Transaxle Input Shaft Speed (A/T ISS) Sensor	In automatic transaxle.
Camshaft Position Sensor (3.1L VIN M) (Buick)	Front of engine, below intake plenum.
Camshaft Position Sensor (3.8L VIN K & VIN 1)	Front of engine, above crankshaft pulley. See Fig. 4 .
Crankshaft Position (CKP) Sensor (7x) (3.1L VIN M) (Buick)	Right side of engine, below exhaust manifold.
Crankshaft Position (CKP) Sensor (24x) (3.1L VIN M) (Buick)	Front of engine, behind harmonic balancer. See Fig. 2 .
Crankshaft Position (CKP) Sensor (3.8L VIN K & VIN 1)	Front of engine, behind harmonic balancer. See Fig. 4 .
Daytime Running Lamp (DRL) Ambient Light Sensor	Top center of dash, at base of windshield.
Engine Coolant Temperature (ECT) Sensor	Top left side of engine, below throttle body.
Heated Oxygen Sensor (HO2S) No. 1	In right bank exhaust manifold.
Heated Oxygen Sensor (HO2S) No. 2	In exhaust system, rear of catalytic converter.
Inside Air Temperature Sensor	Front of dash, below right side of instrument cluster.
Intake Air Temperature (IAT) Sensor (3.1L VIN M) (Buick)	Left front of engine compartment, in air cleaner duct. See Fig. 3 .
Intake Air Temperature (IAT) Sensor (3.8L VIN K)	Left front of engine compartment, in air cleaner duct.
Intake Air Temperature (IAT) Sensor (3.8L VIN 1) (Buick)	Left front of engine compartment, in air cleaner duct. See Fig. 5 .
Knock Sensor (3.1L VIN M) (Buick)	Left side lower engine, above starter. See Fig. 2 .
Knock Sensor Bank 1 (3.8L VIN K & VIN 1)	Left side of engine, in front of starter.
Knock Sensor Bank 2 (3.8L VIN K & VIN 1)	Right side of engine, below exhaust manifold.
Manifold Absolute Pressure (MAP) Sensor (3.1L VIN M) (Buick)	Top right side of engine, above valve cover.
Manifold Absolute Pressure (MAP) Sensor (3.8L VIN K)	Top of engine, on front of intake manifold.
Manifold Absolute Pressure (MAP) Sensor (3.8L VIN 1) (Buick)	Top right side of engine, above valve cover.
Mass Air Flow (MAF) Sensor (3.1L VIN M) (Buick)	Left side of engine, in air cleaner duct. See Fig. 3 .
Mass Air Flow (MAF) Sensor (3.8L VIN K)	Top rear of engine, part of throttle body assembly.
Mass Air Flow (MAF) Sensor (3.8L VIN 1) (Buick)	Top rear of engine, part of throttle body assembly. See Fig. 5 .
Sun Load Temperature Sensor	Top left side of dash.
Throttle Position (TP) Sensor (3.1L VIN M) (Buick)	On throttle body assembly. See Fig. 3 .
Throttle Position (TP) Sensor (3.8L VIN K)	On throttle body assembly.
Throttle Position (TP) Sensor (3.8L VIN 1) (Buick)	On throttle body assembly. See Fig. 5 .
Vehicle Speed Sensor (VSS)	Lower right side of engine compartment, on transaxle.
Wheel Speed Sensor (Left Front)	On left front wheel bearing knuckle.
Wheel Speed Sensor (Left Rear)	On left rear bearing assembly.
Wheel Speed Sensor (Right Front)	On right front wheel bearing knuckle.
Wheel Speed Sensor (Right Rear)	On right rear bearing assembly.

Buick Century Limited 1998 - SOLENOIDS & SOLENOID VALVES

Buick Century Limited 1998 SOLENOIDS & SOLENOID VALVES

Component	Component Location
1-2 Shift Solenoid Valve	In automatic transaxle.
2-3 Shift Solenoid Valve	In automatic transaxle.
Brake Solenoid Valve (Left Front)	Part of brake modulator.
Brake Solenoid Valve (Right Front)	Part of brake modulator.
Electronic Traction Control Brake Pressure Modulator Valve (Buick)	Behind underhood accessory wiring junction block, right rear of engine compartment.
Evaporative Emissions (EVAP) Canister Purge Solenoid Valve (3.1L VIN M) (Buick)	Top right side of engine, behind ignition control module.
Evaporative Emissions (EVAP) Canister Purge Solenoid Valve (3.8L VIN K)	Top left side of engine, near center of valve cover.
Evaporative Emissions (EVAP) Canister Purge Solenoid Valve (3.8L VIN 1) (Buick)	Top right side of engine, near center of valve cover.
Evaporative Emissions (EVAP) Canister Vent Solenoid Valve	Behind left side of rear fascia splash shield, in wheelwell.
Exhaust Gas Recirculation (EGR) Valve (3.1L VIN M) (Buick)	Top rear of engine, near throttle body. See Fig. 3 .
Exhaust Gas Recirculation (EGR) Valve (3.8L VIN K & VIN 1)	Top rear of engine, near throttle body.
Idle Air Control (IAC) Valve (3.1L VIN M) (Buick)	On throttle body assembly. See Fig. 3 .
Idle Air Control (IAC) Valve (3.8L VIN K)	On throttle body assembly.
Idle Air Control (IAC) Valve (3.8L VIN 1) (Buick)	Rear of engine, on supercharger. See Fig. 5 .
Pressure Control Solenoid (PC SOL) Valve	Inside automatic transaxle.
Supercharger Bypass Valve (3.8L VIN 1) (Buick)	Top left of engine, above left valve cover.
Torque Converter Clutch Pulse Width Modulation Solenoid (TCC PWM SOL) Valve	Inside automatic transaxle.
Torque Converter Clutch Solenoid (TCC SOL) Valve	Inside automatic transaxle.
Vacuum/Electric Solenoid	On right side of heater-A/C module.

Buick Century Limited 1998 - SWITCHES

Buick Century Limited 1998 SWITCHES

Component	Component Location
Automatic Transaxle Fluid Pressure Manual Valve Position Switch	Inside automatic transaxle.
Brake Fluid Level Indicator Switch	In brake fluid reservoir.
Cruise Control Release Switch	Under left side of dash, on brake pedal bracket.
Door Lock (Ajar Indicator Switch & Actuator Motor)	In each door.
Driver Information Display Switch (Buick)	Part of fog lamp switch, on side of steering column.
Engine Oil Level Indicator Switch (3.1L VIN M) (Buick)	Lower left side of engine, in oil pan.
Engine Oil Level Indicator Switch (3.8L VIN K & VIN 1)	Lower left side of engine, in oil pan. See Fig. 4 .
Engine Oil Pressure Indicator Switch (3.1L VIN M) (Buick)	Lower left side of engine, above starter. See Fig. 2 .
Engine Oil Pressure Indicator Switch (3.8L VIN K & VIN 1)	Lower right side of engine, above transaxle.
Evaporative Emissions (EVAP) Canister Vacuum Switch (3.1L VIN M) (Buick)	Top right side of engine, above valve cover, near ignition control module.
Evaporative Emissions (EVAP) Canister Vacuum Diagnostic Switch (3.8L VIN K & VIN 1) (Buick)	Top right side of engine, above valve cover, left of generator.
Park Brake Indicator Switch	On parking brake assembly.
Seat Belt Switch	Part of driver's seat belt assembly.
Stop Lamp Switch	On brake pedal support bracket.
Transaxle Range Switch	Left side of engine compartment, on transaxle.
Windshield Washer Solvent Level Switch	Right front corner of engine compartment, in washer fluid reservoir.

Buick Century Limited 1998 - MISCELLANEOUS

Buick Century Limited 1998 MISCELLANEOUS

Component	Component Location
A/C Compressor Clutch Diode (Buick)	In engine wiring harness, approximately 6 inches from A/C compressor clutch coil connector.
A/C Compressor Clutch Diode (Oldsmobile)	In underhood electrical center.
Blower Motor Resistor	In right side of heater-A/C module, under right side of dash.
Data Link Connector (DLC)	Under left side of dash, right of steering column.
Fuel Pump Resistor (Buick)	Outside of right front frame rail, in front of wheel.
Remote CD Changer	Right corner of rear compartment.
Steering Column Electric Park Lock (Buick)	Inside steering column, near ignition key cylinder.

Buick Century Limited 1998 - CONNECTORS

Buick Century Limited 1998 CONNECTORS

Component	Component Location
C101 (Black, 8 Pin)	At left strut tower.
C105 (Gray, 4 Pin)	On right radiator cooling fan.
C111 (Black, 7 Pin)	On top of transaxle.
C113 (Gray, 14 Pin)	On top of transaxle.
C141 (Black, 10 Pin)	Behind left headlamp.
C142 (Black, 10 Pin)	Behind right headlamp.
C200 (Black, 56 Pin)	Behind right side of dash.
C201 (Black, 18 Pin)	On right side of steering column.
C205 (Black, 4 Pin)	On right side of steering column.
C206 (Black, 3 Pin)	Behind right side of dash, near C200.
C240 (Natural, 10 Pin)	Behind front end of console.
C242 (Black, 3 Pin)	Behind ashtray.
C250 (Black, 8 Pin)	Behind center of dash.
C252 (Blue, 32 Pin)	Behind center of dash.
C301 (White, 16 Pin)	At left "A" pillar.
C302 (White, 16 Pin)	At right "A" pillar.
C311 (Black, 6 Pin)	Below driver seat.
C312 (Black, 6 Pin)	Below passenger seat.
C351 (Black, 6 Pin)	At left "B" pillar.
C352 (Black, 6 Pin)	At right "B" pillar.
C380 (10 Pin)	Below rear of console assembly.
C390 (Black, 8 Pin)	Behind lower right "C" pillar trim panel.
C395 (Black, 2 Pin)	Under right side of rear window trim panel.
C398 (Black, 3 Pin)	Behind right "C" pillar trim panel.
C401 (Gray, 6 Pin)	Behind left taillamp.
C402 (Gray, 6 Pin)	Behind right taillamp.
C405 (Black, 8 Pin)	Forward of spare wheelwell.
C410 (Black, 8 Pin)	In right side of trunk.
C420 (2 Pin)	Under center of rear window trim panel.
C915 (4 Pin)	In center of rear compartment lid applique.

Buick Century Limited 1998 - GROUNDS

Buick Century Limited 1998 GROUNDS

Component	Component Location
G100	At base of battery.
G101	Left side of front end upper tie bar.
G102	Right side of front end upper tie bar.
G111 (3.1L VIN M)	On transaxle stud.
G111 (3.8 L VIN K)	On ignition control module bracket.
G111 (3.8 L VIN 1)	On ignition control module bracket.
G113	On transaxle stud.
G117	On transaxle stud.
G119	At base of left strut tower.
G200	Behind right side of glove compartment.
G201	On left side of steering column.
G203	On right side of steering column.
G301	Forward of left front seat.
G390	Above passenger sunshade visor.
G401	Below left side of rear window trim panel.
G402	Below right side of rear window trim panel.

Buick Century Limited 1998 - SPLICES

Buick Century Limited 1998 SPLICES

Component	Component Location
S105	Engine wiring harness, 4 cm from C105 breakout.
S106	Engine wiring harness, 7 cm from PCM breakout.
S109 (3.1L VIN M)	Fuel injector wiring harness, 2 cm from fuel injector No. 2 breakout.
S109 (3.8L VIN K)	Engine wiring harness, 6 cm from C110 breakout.
S109 (3.8L VIN 1)	Engine wiring harness, 6 cm from C110 breakout.
S115 (3.1L VIN M)	Automatic transaxle wiring harness, 11 cm from C111.
S115 (3.8L VIN K)	Automatic transaxle wiring harness, 11 cm from C111.
S115 (3.8L VIN 1)	Automatic transaxle wiring harness, 19 cm from C113.
S124	Forward lamp wiring harness, 7 cm from left headlamp breakout.
S167	Engine wiring harness, 4 cm from PCM breakout.
S202	I/P wiring harness, 19 cm from radio breakout.
S211	I/P wiring harness, 20 cm from instrument cluster breakout.
S220	I/P wiring harness, 18 cm from G200 breakout.
S228	I/P wiring harness, 24 cm from G200 breakout.
S230	I/P wiring harness, 18 cm from radio breakout.
S233	I/P wiring harness, 4 cm from radio breakout.
S234	I/P wiring harness, 13 cm from instrument cluster breakout.
S240	I/P wiring harness, 1 cm from splice pack SP205 breakout.
S241	I/P wiring harness, 15 cm from radio breakout.
S249	I/P wiring harness, 4 cm from C201 breakout.
S255	Mobile telephone wiring harness, 10 cm from C250.
S263	I/P wiring harness, 4 cm from door lock relay breakout.
S267	I/P wiring harness, 11 cm from G200 breakout.
S269	I/P wiring harness, 13 cm from door lock relay breakout.
S270	I/P wiring harness, 4 cm from blower motor control module.
S275	I/P wiring harness, 25 cm from blower motor control module.
S283	I/P wiring harness, 14 cm from headlamp switch breakout.
S295	Ashtray jumper wiring harness, 5 cm from C242.
S301	Body wiring harness, 40 cm from C312 breakout.
S303	Body wiring harness, 10 cm from C311 breakout.
S319	Body wiring harness, 46 cm from C312 breakout.
S323	Body wiring harness, 10 cm from C250 breakout.
S325	Body wiring harness, 23 cm from G301 breakout.
S330	Driver seat adjuster wiring harness, 20 cm from C311 breakout.
S333	Passenger seat adjuster wiring harness, 20 cm from C312 breakout.
S335	Front floor console wiring harness, 7 cm from accessory power receptacle breakout.
S336	Front floor console wiring harness, 20 cm from C240.
S348	Body wiring harness, 16 cm from C312 breakout.
S350	Body wiring harness, 10 cm from C312 breakout.
S383	Quarter courtesy & reading lamp wiring harness, 31 cm from left sunshade mirror breakout.
S385	Quarter courtesy & reading lamp wiring harness, 5 cm from right sunshade mirror breakout.
S402	Right taillamp wiring harness, 3 cm from P402.
S403	Left taillamp wiring harness, 3 cm from P401.
S406	Body wiring harness, 4 cm from right radio speaker breakout.
S408	Body wiring harness, 33 cm from C390 breakout.
S410	Body wiring harness, 7 cm from C405 breakout.
S414	Body wiring harness, 5 cm from C420 breakout.
S416	CHMSL wiring harness, 5 cm from center high mounted stop lamp breakout.
S420	Body wiring harness, 23 from C390 breakout.
S431	Left taillamp wiring harness, 5 cm from P401.
S432	Right taillamp wiring harness, 5 cm from P402.
S440	Body wiring harness, 6.5 cm from right rear radio speaker breakout.
S504	Left front door wiring harness, 8 cm from window switch breakout.
S604	Right front door wiring harness, 8 cm from window switch breakout.
S905	Rear compartment lid wiring harness, 7 cm from P415.
S915	Back-up lamp wiring harness, 17 cm from P415.
S919	Back-up lamp wiring harness, 23 cm from P415.