Buick Regal Custom 1991 - ELECTRICAL COMPONENT LOCATOR 1991 ELECTRICAL COMPONENT LOCATIONS General Motors Corp. - Electrical Components

Buick Regal Custom 1991 - BUZZERS, RELAYS & TIMERS

Buick Regal Custom 1991 BUZZERS, RELAYS & TIMERS LOCATION

Component	Location
ABS System
Front Enable Relay	At ABS power center. See Fig. 1 .
Pump Motor Relay	On left rear of engine compartment, left side of master cylinder.
Rear Enable Relay	At ABS power center. See Fig. 1 .
A/C-Heater System
Compressor Relay
2.3L VIN "D"	In right side underhood electrical center. See Fig. 2 .
3.1L VIN "T"	In right side underhood electrical center. See Fig. 3 .
3.4L VIN "X"	In right side underhood electrical center. See Fig. 4 .
Right Side Electrical Center	In right side underhood electrical center. See Fig. 5 .
High Blower Relay	In convenience center. See Fig. 6 .
Lower Blower Relay	In convenience center. See Fig. 6 .
Cooling Fan Relays
Primary & Secondary
2.3L VIN "D"	In right side underhood electrical center. See Fig. 2 .
3.1L VIN "T"	In right side underhood electrical center. See Fig. 3 .
3.4L VIN "X"	In right side underhood electrical center. See Fig. 4 .
Right Side Electrical Center	In right side underhood electrical center. See Fig. 5 .
Defogger/Timer Relay	In convenience center. See Fig. 6 .
Fog Light Relay	In forward light electrical center. See Fig. 7 .
Fuel Pump Relay
2.3L VIN "D"	In left side underhood electrical center. See Fig. 2 .
3.1L VIN "T"	In left side underhood electrical center. See Fig. 3 .
3.4L VIN "X"	In left side underhood electrical center. See Fig. 4 .
Left Side Electrical Center	In left side underhood electrical center. See Fig. 8 .
Hazard Flasher Relay	In convenience center. See Fig. 6 .
Horn Relay
Regal
2-Door	In forward light electrical center. See Fig. 7 .
4-Door	In right side of engine compartment.
Cutlass Supreme
With Fog Lights	In forward light electrical center. See Fig. 7 .
Without Fog Lights	In right side of engine compartment.
Power Antenna Relay	In fender, behind right rear wheelweel.
Power Door Lock Relay	On right kick panel, above center access hole.
Turn Signal Flasher Relay	Behind instrument cluster, to right of steering column.

Buick Regal Custom 1991 - CIRCUIT PROTECTION DEVICES

Buick Regal Custom 1991 CIRCUIT PROTECTION DEVICES LOCATION

Component	Location
ABS Brake Valve Fuse	In ABS power center. See Fig. 1 .
ABS Controller Fuse	In ABS power center. See Fig. 1 .
ABS Elect. Valve Fuse	In ABS power center. See Fig. 1 .
ABS Power Center	In left side of engine compartment, forward of strut tower. See Fig. 1 .
Automatic Seat Belts Fuse	In convenience center. See Fig. 6 .
Circuit Breakers
Headlights	In convenience center. See Fig. 6 .
Power Accessories	In convenience center. See Fig. 6 .
Power Windows	In convenience center. See Fig. 6 .
Rear Window Defogger	In convenience center. See Fig. 6 .
Convenience Center	Behind right side of instrument panel. See Fig. 6 .
ECM Fuse	In left side underhood electrical center. See Fig. 8 .
Fog Light Relay Fuse	In forward light electrical center. See Fig. 7 .
Forward Light Electrical Center	At right front corner of engine compartment. See Fig. 7 .
Fuel Pump Fuse (Regal)	In left side electrical center. See Fig. 8 .
Fuse Block
2.3L VIN "D"	Behind right side of instrument panel. See Fig. 2 .
3.1L VIN "T"	Behind right side of instrument panel. See Fig. 3 .
3.4L VIN "X"	Behind right side of instrument panel. See Fig. 4 .
3.8L VIN "L"	Behind right side of instrument panel. See Fig. 9 .
Fusible Links
ABS Pump Motor ("A")	In ABS power center. See Fig. 1 .
ABS Electronic Brake Valve ("B")	In ABS power center. See Fig. 1 .
ABS ("X" & "Y")	Near left side underhood electrical center. See Fig. 8 .
Ignition ("K", "P" & "R")	In right side underhood electrical center. See Fig. 5 .
Primary Cooling Fans ("N")	In right side underhood electrical center. See Fig. 5 .
Rear Defogger/Power Accessory ("L")	In right side underhood electrical center. See Fig. 5 .
Secondary Cooling Fan ("L")	In right side underhood electrical center. See Fig. 5 .
Sec. Cooling Fan ("M") (Regal)	In right side underhood electrical center. See Fig. 5 .
Starter/Charging System ("A")	Below left side underhood electrical center. See Fig. 8 .
Starter/Charging System ("B")	Lower front of engine, at starter assembly.
Starter/Charging Sys. ("C") (Regal)	Lower front of engine, at starter assembly.
Starter/Charging System ("D")	At left side underhood electrical center. See Fig. 8 .
Underhood Electrical Centers
Left Side
2.3L VIN "D"	On left side of engine compartment, on strut tower. See Fig. 2 .
3.1L VIN "T"	On left side of engine compartment, on strut tower. See Fig. 3 .
3.4L VIN "X"	On left side of engine compartment, on strut tower. See Fig. 4 .
3.8L VIN "L"	On left side of engine compartment, on strut tower. See Fig. 9 .
Left Side Electrical Center	On left side of engine compartment, on strut tower. See Fig. 8 .
Right Side
2.3L VIN "D"	On right side of engine compartment, on strut tower. See Fig. 2 .
3.1L VIN "T"	On right side of engine compartment, on strut tower. See Fig. 3 .
3.4L VIN "X"	On right side of engine compartment, on strut tower. See Fig. 4 .
3.8L VIN "L"	On right side of engine compartment, on strut tower. See Fig. 9 .
Right Side Electrical Center	On right side of engine compartment, on strut tower. See Fig. 5 .

Buick Regal Custom 1991 - CONTROL UNITS

Buick Regal Custom 1991 CONTROL UNITS LOCATION

Component	Location
ABS Controller	Under passenger's seat.
Audio Alarm Mod. (Cutlass Sup.)	In convenience center. See Fig. 6 .
Chime Module	In convenience center. See Fig. 6 .
Cruise Control Module	Behind instrument cluster, left of brake pedal support.
Direct Ignition System (DIS) Module	Below exhaust manifold, on right front of engine.
Driver Information Center (DIC)	Behind right side of Module Instrument panel.
Electronic Control Module (ECM)
2.3L VIN "D"	In front of right strut tower. See Fig. 2 .
3.1L VIN "T"	In front of right strut tower. See Fig. 3 .
3.4L VIN "X"	In front of right strut tower. See Fig. 4 .
3.8L VIN "L"	In front of right strut tower. See Fig. 9 .
Keyless Entry Module	On right rear passenger compartment, on rear shelf.
Light Driver Module	Behind right side of dash, right of steering column.
Lumbar Seat Control Module	Under driver's seat.
Park/Turn Light Module	In forward light electrical center. See Fig. 7 .
Passive Restraint Control Module	Behind right side of instrument panel.
Radio Control Interface Module	Inside top of steering column.
Sun Roof Module	In center of windshield header.
Switch & Electronics Module	Center of steering column.

Buick Regal Custom 1991 - SENDING UNITS & SENSORS

Buick Regal Custom 1991 SENDING UNITS & SENSORS LOCATION

Component	Location
ABS Wheel Speed Sensor	Behind each wheel hub.
A/C Pressure Sensor
2.3L VIN "D"	In left front of engine, on A/C line. See Fig. 2 .
3.1L VIN "T"	In left front of engine, on A/C line. See Fig. 3 .
3.4L VIN "X"	In left front of engine, on A/C line. See Fig. 4 .
Coolant Level Sensor
3.1L VIN "T"	On rear of radiator. See Fig. 3 .
3.4L VIN "X"	On rear of radiator. See Fig. 4 .
Coolant Temperature Sender	On lower left rear of engine, below throttle assembly.
Coolant Temperature Sensor (CTS)
2.3L VIN "D"	On top left side of engine, below coolant outlet. See Fig. 2 .
3.1L VIN "T"	On top left side of engine, below coolant outlet. See Fig. 3 .
3.4L VIN "X"	On top left side of engine, below coolant outlet. See Fig. 4 .
3.8L VIN "L"	On top left side of engine, below coolant outlet. See Fig. 9 .
Camshaft Sensor	On right side of engine.
Crankshaft Sensor
VIN D	On lower front of engine, near oil filter.
Except VIN D	On right side of engine.
Detonation Sensor
VIN D	On lower left rear of engine.
Except VIN D	On right rear of engine.
Knock Sensor	Below exhaust manifold, at right rear of engine.
Mass Airflow (MAF) Sensor	On top left side of engine. See Fig. 9 .
Manifold Absolute Press. (MAP) Sensor
VIN D	On top front of engine. See Fig. 2 .
Except VIN D	On top rear of engine, on intake plenum. See Fig. 3 .
Manifold Air Temp. (MAT) Sensor
2.3L VIN "D"	On left front of engine compartment, on air intake assembly. See Fig. 2 .
3.1L VIN "T"	On left front of engine compartment, on air intake assembly. See Fig. 3 .
3.4L VIN "X"	On left front of engine compartment, on air intake assembly. See Fig. 4 .
3.8L VIN "L"	On left front of engine compartment, on air intake assembly. See Fig. 9 .
Oil Pressure Sensor
3.1L VIN "T"	On left side of engine. See Fig. 3 .
3.4L VIN "X"	On left side of engine. See Fig. 4 .
Throttle Position Sensor (TPS)
2.3L VIN "D"	On throttle body. See Fig. 2 .
3.1L VIN "T"	On throttle body. See Fig. 3 .
3.4L VIN "X"	On throttle body. See Fig. 4 .
3.8L VIN "L"	On throttle body. See Fig. 9 .
Vehicle Speed Sensor (VSS)
2.3L VIN "D"	Behind right rear of engine, on transaxle. See Fig. 2 .
3.1L VIN "T"	Behind right rear of engine, on transaxle. See Fig. 3 .
3.4L VIN "X"	Behind right rear of engine, on transaxle. See Fig. 4 .
3.8L VIN "L"	Behind right rear of engine, on transaxle. See Fig. 9 .

Buick Regal Custom 1991 - MOTORS

Buick Regal Custom 1991 MOTORS LOCATION

Component	Location
ABS Pump Motor	On left side of master cylinder.
A/C Air Temp. Valve Motor	Behind right side of instrument panel, in plenum.
A/C-Heater Blower Motor	Behind right side of instrument panel, in plenum.
Idle Air Control (IAC) Motor
2.3L VIN "D"	At top of engine, on throttle assembly. See Fig. 2 .
3.1L VIN "T"	At top of engine, on throttle assembly. See Fig. 3 .
3.4L VIN "X"	At top of engine, on throttle assembly. See Fig. 4 .
3.8L VIN "L"	At top of engine, on throttle assembly. See Fig. 9 .
Lumbar Seat Pump/Motor	Below driver's seat.
Power Antenna Motor	In fender, behind right rear wheelwell.
Power Door Lock Motors	Near rear of each door.
Power Seat Motors	Below driver's seat.
Power Window Motors	In bottom center of each door.
Windshield Washer Pump Motor	In windshield washer fluid reservoir.
Windshield Wiper Motor	In engine compartment, on left side of firewall.

Buick Regal Custom 1991 - SOLENOIDS & SOLENOID VALVES

Buick Regal Custom 1991 SOLENOIDS & SOLENOID VALVES LOCATION

Component	Location
Air Select/Switching Valve	On right rear side of engine.
Canister Purge Solenoid
2.3L VIN "D"	On top rear of engine, on intake plenum. See Fig. 2 .
3.1L VIN "T"	On top rear of engine, on intake plenum. See Fig. 3 .
3.4L VIN "X"	On top rear of engine, on intake plenum. See Fig. 4 .
3.8L VIN "L"	On top rear of engine, on intake plenum. See Fig. 9 .
EGR Solenoid	On left rear of engine, on exhaust manifold.
Elec. Vac. Regulator Valve (EVRV)	At rear of engine, at valve cover.
Seat Belt Retractor Solenoids	In bottom of each door.
Torque Converter Clutch (TCC) Solenoid	On transaxle valve body.
Trunk Release Solenoid	In center trunk lid, above license plate.

Buick Regal Custom 1991 - SWITCHES

Buick Regal Custom 1991 SWITCHES LOCATION

Component	Location
A/C System
Accumulator Pressure Switch	On right side of master cylinder.
Cycling Pressure Switch	On A/C accumulator, in front of engine compartment.
High Pressure Switch	On high pressure line, between evaporator and accumulator.
Intermediate Pressure Switch	On A/C accumulator, in left front of engine compartment.
Low Pressure Switch	On back of A/C compressor.
Back-Up Light Switch	On top of transaxle.
Brake Switch	Behind left side of instrument panel, on brake pedal support.
Brake Fluid Level Switch	On master cylinder.
Clutch Start Switch	On clutch pedal support.
Coolant Temperature Switch
2.3L VIN "D"	On lower left rear of engine, below throttle assembly. See Fig. 2 .
3.1L VIN "T"	On lower left rear of engine, below throttle assembly. See Fig. 3 .
3.4L VIN "X"	On lower left rear of engine, below throttle assembly. See Fig. 4 .
Cruise Brake Switch	Below left side of dash, on brake pedal support.
Cruise Clutch Switch	Below left side of dash, on clutch pedal support.
Door Latch Switch	In wiring harness, in middle rear of each door.
Fuel Pump/Oil Press. Switch/Sender
VIN D	On left side of engine, above coolant outlet. See Fig. 2 .
Except VIN D
With Oil Cooler
3.1L VIN "T"	On left front side of engine, below oil cooler. See Fig. 3 .
3.4L VIN "X"	On left front side of engine, below oil cooler. See Fig. 4 .
3.8L VIN "L"	On left front side of engine, below oil cooler. See Fig. 9 .
Without Oil Cooler
3.1L VIN "T"	On right front side of engine, above oil filter. See Fig. 3 .
3.4L VIN "X"	On right front side of engine, above oil filter. See Fig. 4 .
3.8L VIN "L"	On right front side of engine, above oil filter. See Fig. 9 .
Parking Brake Switch	Behind left side of instrument panel, on brake pedal support.
Park/Neutral (P/N) Switch
2.3L VIN "D"	On top of transaxle, below master cylinder. See Fig. 2 .
3.1 VIN "T"	On top of transaxle, below master cylinder. See Fig. 3 .
3.4L VIN "X"	On top of transaxle, below master cylinder. See Fig. 4 .
3.8L VIN "L"	On top of transaxle, below master cylinder. See Fig. 9 .
Power Steering Press Sw. (PSPS)
3.1L VIN "T"	On steering gear assembly, near input shaft. See Fig. 3 .
3.4L VIN "X"	On steering gear assembly, near input shaft. See Fig. 4 .
Seat Belt Switch	In driver's seat belt assembly.
Transaxle Position Switch	In lower left side of engine compartment, on transaxle.

Buick Regal Custom 1991 - MISCELLANEOUS

Buick Regal Custom 1991 MISCELLANEOUS LOCATION

Component	Location
A/C Compressor Clutch Diode	Near A/C compressor, in engine harness.
A/C-Heater Blower Motor Resistors	Below right side of instrument panel, in plenum.
A/C-Heater System Solenoid Box	Behind right side of instrument panel, on right side of plenum.
ALDL Diagnostic Connector
2.3L VIN "D"	Below instrument cluster, right of steering column. See Fig. 2 .
3.1 VIN "T"	Below instrument cluster, right of steering column. See Fig. 3 .
3.4L VIN "X"	Below instrument cluster, right of steering column. See Fig. 4 .
3.8L VIN "L"	Below instrument cluster, right of steering column. See Fig. 9 .
Fuel Pump Prime Connector
2.3L VIN "D"	Taped to wiring harness, below left electrical center. See Fig. 2 .
3.1 VIN "T"	Taped to wiring harness, below left electrical center. See Fig. 3 .
3.4L VIN "X"	Taped to wiring harness, below left electrical center. See Fig. 4 .
3.8L VIN "L"	Taped to wiring harness, below left electrical center. See Fig. 9 .
Photo Resistor	On top left side of instrument panel, near left front speaker.
SFI In-Line Resistor	In right front of engine compartment, in engine harness.