Buick Century Limited 1991 - ELECTRICAL COMPONENT LOCATOR 1991 ELECTRICAL COMPONENT LOCATIONS General Motors Corp. - Electrical Components

Buick Century Limited 1991 - BUZZERS, RELAYS & TIMERS

Buick Century Limited 1991 BUZZERS, RELAYS & TIMERS LOCATION

Component	Location
A/C Compressor Relay	On bracket, at right front corner of engine compartment. See Fig. 1 -6.
A/C-Heater Blower Relay	On relay bracket, at right front corner of engine compartment. See Fig. 3 -6.
Cooling Fan Relay	On relay bracket, at right front corner of engine compartment. See Fig. 1 -6.
Defogger Time Relay	In rear defogger control unit.
Electronic Level Control (ELC) Relay	At left side of luggage compartment.
Fog Light Relay (6000)	Taped to harness, right of steering column.
Fuel Pump Relay	On relay bracket, at right front corner of engine compartment. See Fig. 1 -6.
Hazard Flasher Relay	On convenience center.
Horn Relay	On convenience center.
Power Antenna Relay	Behind right side of dash, above glove compartment.
Power Door Lock Relay	At top of right kick panel.
Tailgate Release Relay	Behind right side of dash, at center of glove box.
Turn Signal Flasher Relay	Behind left side of dash, above accelerator pedal.

Buick Century Limited 1991 CIRCUIT PROTECTION DEVICES LOCATION

Component	Location
Auto. Seat Belt In-Line Fuse	Behind right side of dash, taped on harness, near fuse block.
Battery Junction Block	On right fender panel, in front of canister purge solenoid valve. See Fig. 2 .
Convenience Center	Behind right side of dash.
ECM/Fuel Pump In-Line Fuse	On relay bracket, at right front corner of engine compartment. See Fig. 1 -6.
Fuse Block
2.5L & 3.3L	Behind right side of dash, to left of glove box. See Fig. 1 & 3.
3.1L	Behind left side of dash, to right of steering column. See Fig. 2 .
Fusible Links
A/C-Heater Blower Relay (Rust)	At starter solenoid.
Fuel Pump Relay (Rust)	At battery junction block.
Alternator (Blue)	At starter solenoid.
Battery Junction Block (Rust)	In harness, near battery.
Cooling Fan Relays (Rust)
6000	At battery junction block.
Except 6000	At starter solenoid.
Ignition Switch (Black)	In harness, next to battery.
Light Switch (Rust)	In harness, next to battery.
Power Accy./Hazard (Rust)	In harness, next to battery.
Lumbar Seat Switch Fuse	In convenience center.
Power Accessory Circuit Breaker	In fuse block.
Power Window Circuit Breaker	In fuse block.
Radio Fuse	In convenience center.

Buick Century Limited 1991 CONTROL UNITS LOCATION

Component	Location
Audio Alarm Module	In convenience center.
Auto. Seat Belt Control Module	Behind right side kick panel.
Cruise Control Module	Behind dash, above accelerator pedal.
Electronic Control Module (ECM)	Behind right side of dash, behind glove box. See Fig. 1 -3.
Remote Keyless Entry Module	On left front of luggage compartment, above wheelwell.
Steering Wheel Controls
Switch & Electronics Module	Attached to underside of steering column.
Translator Module	Attached to underside of steering column.

Buick Century Limited 1991 SENDING UNITS & SENSORS LOCATION

Component	Location
Coolant Temp. Sending Unit/Switch
2.5L	In cylinder head, in front of coolant outlet.
3.1L	At right rear corner of cylinder head.
3.3L	Under alternator, to left of coolant temperature sensor.
Coolant Temperature Sensor (CTS)
2.5L	At top left side of engine, below coolant outlet. See Fig. 1 .
3.1L	At top left side of engine, below throttle body. See Fig. 2 .
3.3L	Under alternator, to right of coolant temperature sending unit. See Fig. 3 .
Crankshaft Position Sensor (3.1L)	On right side of engine block behind A/C compressor. See Fig. 2 .
Dual Crank Sensor (3.3L)	On right side of engine block. See Fig. 3 .
Electronic Level Cont. Height Sensor (6000)
Sedan	On rear frame, near right rear shock.
Wagon	On rear frame, in front of fuel tank.
Knock Sensor
3.1L	On right front side of engine block, below alternator. See Fig. 2 .
3.3L	At lower right rear of engine block. See Fig. 3 .
Man. Absolute Press. (MAP) Sensor
2.5L	On right side of air cleaner. See Fig. 1 .
3.1L	On valve cover bracket, behind alternator. See Fig. 2 .
Man. Air Temp. (MAT) Sensor
2.5L	In intake runner, in front of throttle body. See Fig. 1 .
3.1L	In air cleaner housing.X4
Mass Airflow (MAF) Sensor (3.3L)	On throttle body. See Fig. 3 .
Throttle Position Sensor (TPS)	On throttle body. See Fig. 1 -3.
Vehicle Speed Sensor (VSS)	On top right side of transaxle. See Fig. 1 -3.

Buick Century Limited 1991 MOTORS LOCATION

Component	Location
A/C-Heater Blower Motor	On right side of engine compartment.
Elect. Level Control Compressor	On frame, behind left rear wheelwell.
Idle Air Control (IAC) Motor	On throttle body. See Fig. 1 -3.
Power Antenna Motor	On rail assembly, at base of antenna.
Power Door Lock Motor	Near lower rear portion of each door.
Power Mirror Motor	In each mirror assembly.
Power Seat Motor	Under seat assembly.
Power Window Motor	In each door.
Windshield Washer Motor (Front & Rear)	In washer fluid reservoir.
Windshield Wiper Motor
Front	On left rear of engine compartment, near brake master cylinder.
Rear	In top center of tailgate.

Buick Century Limited 1991 SOLENOIDS & SOLENOID VALVES LOCATION

Component	Location
Automatic Seat Belt
Lap Retractor Release Solenoid	In lower rear of respective front door.
Shoulder Retractor Release Solenoid	In lower rear of respective front door.
Canister Purge Solenoid	On vapor canister. See Fig. 2 , Fig. 3 , Fig. 5 & 6.

Buick Century Limited 1991 SWITCHES LOCATION

Component	Location
A/C High Pressure Cut-Out Switch	At rear of compressor. See Fig. 1 & 2.
A/C Low Pressure Cut-Out Switch	At rear of compressor. See Fig. 1 & 2.
A/C Pressure Fan Switch (3.1L)	In refrigerant line, behind compressor. See Fig. 2 .
Brake/Cruise/TCC Switch	On brake pedal support.
Brake Fluid Level Switch	In brake fluid reservoir.
Coolant Temp. Gauge Sw. (3.1L)	On right rear of engine, near EGR valve. See Fig. 2 .
Fuel Pump/Oil Pressure Sender Switch
2.5L	Behind DIS coil pack.
3.1L & 3.3L	On lower left rear of engine, above oil filter. See Fig. 3 .
Park/Neutral (P/N) Switch	On top left side of transaxle. See Fig. 1 -3.
Parking Brake Switch	On parking brake assembly.
Power Steering Press. Sw. (PSPS)	On lower right rear of engine, in power steering line. See Fig. 1 -3.
Seat Belt Switch	On driver's seat belt assembly.
Tailgate Ajar Switch (Wagon)	Bottom center of tailgate.
Transaxle Position Switch	On top left rear of transaxle.

Buick Century Limited 1991 MISCELLANEOUS LOCATION

Component	Location
A/C Compressor Diode
2.5	In compressor wiring connector, below alternator.
3.1L & 3.3L	In compressor wiring below, A/C compressor.
A/C-Heater Blower Resistors	In blower fan housing, in engine compartment.
ALDL Diagnostic Connector	Under center of dash. See Fig. 1 -3.
Fuel Pump Prime/Test Connector	On right side of engine compartment, near strut tower. See Fig. 1 -3.
Power Seat Capacitors	In harness, under respective front seats.