Buick LeSabre 1991 - ELECTRICAL COMPONENT LOCATOR 1991 ELECTRICAL COMPONENT LOCATIONS General Motors Co. Electrical Components

Buick LeSabre 1991 - BUZZERS, RELAYS & TIMERS

Buick LeSabre 1991 BUZZERS, RELAYS & TIMERS LOCATION

Component	Location
ABS Main Relay	On left side of engine compartment firewall, on relay bracket. See Fig. 1 .
ABS Pump Relay	On left side of engine compartment firewall, on relay bracket. See Fig. 1 .
A/C Compressor Relay
3.8L VIN L	On right side of engine compartment firewall, on relay bracket. See Fig. 2 .
3.8L VIN C	On right side of engine compartment firewall, on relay bracket. See Fig. 3 .
A/C Cutout Relay	On right side of engine compartment firewall, on relay bracket. See Fig. 4 .
A/C-Heater Blower Motor Relay
3.8L VIN L	On right side of engine compartment firewall, on relay bracket. See Fig. 2 .
3.8L VIN C	On right side of engine compartment firewall, on relay bracket. See Fig. 3 .
Firewall	On right side of engine compartment firewall, on relay bracket. See Fig. 4 .
Antenna Relay	In right side of luggage compartment, behind wheel housing.
Cooling Fan Relays
VIN C	On left fender panel, on relay bracket. See Fig. 3 .
VIN L	On right side of engine compartment firewall, on relay bracket. See Fig. 2 .
Defogger Timer Relay	On top of right kick panel.
Elec. Level Control (ELC) Inflator Timer Relay	On right front of luggage compartment.
Fog Light Relay	In engine compartment relay center.
Fuel Door Lock Relay	Behind right side of dash, left of relay center.
Fuel Pump Relay	On the relay center, behind glove box, 2nd column of relays, 2nd one from the top.
Hazard Flasher Relay	Under left side of dash, on right side of steering column brace.
Illuminated Entry Timer	Behind right side of dash, left of relay center.
Interior Lights Relay	On the relay center, behind glove box, 2nd column of relays, at bottom.
Horn Relay	At position No. 2 of fuse/relay block, in engine compartment.
Power Antenna Relay	In right side of trunk, attached to antenna mast.
Power Door Lock Relay Assembly	Behind right side of dash, left of relay center.
Power Seat Relay	Under seat, on right lower seat rail.
Retained Accessory Power Relay # 1	On the relay center, behind glove box, 1st column of relays, at bottom.
Retained Accessory Power Relay # 2	On the relay center, behind glove box, 2nd column of relays, at top.
Seat Belt Retractor Release Solenoid Timer	Behind right side of dash, lower left of relay center.
Starter Enable Relay	Behind left side of dash, left of steering column.
Sunroof Relay	On center of windshield header.
Theft Deterrent Relay	Under left side of dash, above theft deterrent controller.
Trunk Lid Release Relay	In engine compartment relay center.
Turn Signal Flasher Relay	Behind dash, on left side of steering column brace.

Buick LeSabre 1991 - CIRCUIT PROTECTION DEVICES

Buick LeSabre 1991 CIRCUIT PROTECTION DEVICES LOCATION

Component	Location
Fuse/Relay Blocks
Engine Compartment	On right side of firewall. See Fig. 4 .
Passenger Compartment	Behind left side of dash. See Fig. 3 .
Power Door Lock Circuit Breaker	In passenger compartment fuse/relay block.
Power Seat Circuit Breaker	In passenger compartment fuse/relay block.
Power Window Circuit Breaker	In passenger compartment fuse/relay block.
Relay Center
Engine Compartment	On right side of firewall.
Passenger Compartment
3.8L VIN L	Behind right side of dash. See Fig. 2 .
3.8L VIN C	Behind right side of dash. See Fig. 3 .

Buick LeSabre 1991 - CONTROL UNITS

Buick LeSabre 1991 CONTROL UNITS LOCATION

Component	Location
ABS Control Module	Behind right center of dash.
A/C-Heater Blower Control Module	On right side of firewall, below relay center. See Fig. 4 .
Adaptive Lamp Monitor Module	Behind LH side of I/P, RH side of steering column support.
Air Bag System
Diagnostic Module	Below right front seat.
Energy Reserve Module	Below right front seat.
Resistor Module	Behind right side of dash, above fuse/relay block.
Cruise Control Module	Behind left side of dash, left of steering column.
Diag. Energy Reserve Module (DERM)	Behind right side of dash.
Elec. Climate Control Power Module	On right side of firewall, above blower motor.
Elec. Climate Control Programmer	Under right side of dash, near left side of glove box.
Electronic Compass Module	Below rear deck shelf.
Electronic Control Module (ECM)
3.8L VIN L	Behind right side of dash. See Fig. 2 .
3.8L VIN C	Behind right side of dash. See Fig. 3 .
Headlight Washer Timer Module	Behind right side of dash, left of relay center.
Heated Windshield
Control Module	Behind right side of dash.
Power Module	Behind right of front bumper.
Keyless Entry Module	Behind right side of dash, above glove box.
Light Control Module (Park Ave.)	Above fuse block, left side of dash.
Lights Monitor Module (SE W/ DIC Models)	Behind right side of dash, near shroud.
Multi-Function Chime Module	Behind right side of dash, above glove box.
Oil Level Module	Behind right side of dash.
Pass-Key Decoder Module	Behind right side of dash.
Power Train Control Module	Behind right side of dash.
Power Window (Express Down) Module	In center rear of left front door.
Remote Accessory Control Module	Behind right side of dash.
Remote Dimmer Module	Behind center of dash.
Steering Wheel Pad Switch & Electronics Module	In steering wheel.
Sun Roof Control Module	At right of windshield header, above front door.
Theft Deterrent Controller	Under left side of dash, above accelerator pedal.
Twilight Sentinel/Daytime Running Lights Module	Behind right side of instrument panel, above glove box.
Wiper Motor Module	On left rear of engine compartment, behind strut tower.

Buick LeSabre 1991 - SENDING UNITS & SENSORS

Buick LeSabre 1991 SENDING UNITS & SENSORS LOCATION

Component	Location
ABS Speed Sensors	On each wheel assembly.
A/C Ambient Temperature Sensor	In front of engine compartment, on center radiator support.
A/C In-Car Temp. Sensor	Behind center of dash.
A/C Temperature Sensor
High Pressure Side	In A/C discharge line, near right shock tower.
Low Pressure Side	In A/C suction line, at right side of firewall.
Air Bag Forward Sensor	On radiator top support bracket, in front center of vehicle.
Camshaft Position Sensor
3.8L VIN L	On lower left side of engine, above lower pulley. See Fig. 2 .
3.8L VIN C	On lower left side of engine, above lower pulley. See Fig. 3 .
Coolant Temp. Sending Unit	On top left rear of engine.
Coolant Temperature Sensor
3.8L VIN L	On top left rear of engine. See Fig. 2 .
3.8L VIN C	On top left rear of engine. See Fig. 3 .
Crankshaft Position Sensor
3.8L VIN L	On lower right side of engine, behind crank pulley. See Fig. 2 .
3.8L VIN C	On lower right side of engine, behind crank pulley. See Fig. 3 .
Elec. Level Control (ELC) Height Sensor	Near right rear strut tower or above right rear suspension arm.
Knock Sensor
3.8L VIN L	On lower right side of engine, near oil filter. See Fig. 2 .
3.8L VIN C	On lower right side of engine, near oil filter. See Fig. 3 .
Low Coolant Sensor	On right side of radiator.
Manifold Absolute Pressure (MAP) Sensor	At center of firewall, above blower motor.
Manifold Air Temp. (MAT) Sensor
3.8L VIN L	In air intake duct, on left side of engine compartment. See Fig. 2 .
3.8L VIN C	In air intake duct, on left side of engine compartment. See Fig. 3 .
Mass Airflow (MAF) Sensor
3.8L VIN L	In air intake duct, above TPS. See Fig. 2 .
3.8L VIN C	In air intake duct, above TPS. See Fig. 3 .
Oil Press. Sending Unit/Switch	On lower right front of engine, on oil filter housing.
Sunload Sensor	Under top left of dash.
Throttle Position Sensor (TPS)
3.8L VIN L	On throttle body. See Fig. 2 .
3.8L VIN C	On throttle body. See Fig. 3 .
Vehicle Speed Sensor (VSS)
3.8L VIN L	On top rear of transaxle. See Fig. 2 .
3.8L VIN C	On top rear of transaxle. See Fig. 3 .

Buick LeSabre 1991 - MOTORS

Buick LeSabre 1991 MOTORS LOCATION

Component	Location
ABS Pump Motor	On bottom of master cylinder assembly.
A/C-Heater Blower Motor	Near center of firewall, in engine compartment. See Fig. 4 .
Elec. Level Control Compressor	On left inner fender panel, behind headlights.
Fuel Door Lock Motor	On left side of luggage compartment, above wheel housing.
Idle Air Control (IAC) Motor
3.8L VIN L	On rear of throttle body. See Fig. 2 .
3.8L VIN C	On rear of throttle body. See Fig. 3 .
Lugg. Comp. Pull-Down Motor	Near latch, at center of luggage compartment.
Power Door Lock Motor	In rear of each door.
Power Seat Motors	Below front portion of front seats.
Power Seat Recliner Motor	In seat bottom frame.
Power Window Motors	In lower center of each door.
Seat Belt Retract Motor	In door, at rear brace.
Sun Roof Motor	In windshield header, above right seat.
Windshield Wiper Motor	At left rear corner of engine compartment.

Buick LeSabre 1991 - SOLENOIDS & SOLENOID VALVES

Buick LeSabre 1991 SOLENOIDS & SOLENOID VALVES LOCATION

Component	Location
ABS Main Valve Solenoid	On bottom left side of master cylinder assembly.
Canister Purge Solenoid View
3.8L VIN L	On vapor canister, at left front corner of engine compartment. See Fig. 2 .
3.8L VIN C	On vapor canister, at left front corner of engine compartment. See Fig. 3 .
Elec. Level Control Inflator Solenoid	In right front corner of luggage compartment.
Fuel Door Release Solenoid	In left side of luggage compartment.
Luggage Compartment Lid Release Solenoid	Under side of luggage compartment lid, near latch.
Power Seat Solenoid	Under each front seat.
Seat Belt Retractor Solenoids	In each door, attached to retract motor.
Shift Interlock Solenoid
Column Shifter	On underside of steering column, near mounting bracket.
Console Shifter	Below center console, front of shift lever base.

Buick LeSabre 1991 - SWITCHES

Buick LeSabre 1991 SWITCHES LOCATION

Component	Location
A/C High Press. Cut-Out Switch	At rear of A/C compressor.
A/C Pressure Cooling Fan Switch
VIN C	On A/C line, near right rear of radiator.
VIN L	On A/C line, near starter motor.
A/C Pressure Cycling Switch	On A/C accumulator. See Fig. 4 .
Air Bag Arming Switch	Below right front seat.
Brake Fluid Level Switch	In master cylinder fluid reservoir.
Brakelight Switch	On brake pedal support.
Brake Pressure Switch	In left side of master cylinder.
Cooling Fan Temp. Switch	On top right side of engine, near alternator.
Luggage Compartment
Lid Ajar Switch	At center rear of luggage compartment, near latch.
Tamper Switch	At center rear of luggage compartment, near latch.
Parking Brake Switch	On top of parking brake pedal assembly.
Power Steering Pressure Switch	On power steering rack.
Seat Belt Switch
Active Restraint	In left center pillar, at retractor solenoid.
Passive Restraint	In lower rear portion of left front door, at retractor solenoid.
Sun Roof Limit Switch	In roof, near top of right windshield pillar.
Transaxle Overdrive Switch	On left side of transaxle.
Transaxle Position Switch	On top left side of transaxle.
Washer Fluid Level Switch	In windshield washer reservoir.

Buick LeSabre 1991 - MISCELLANEOUS

Buick LeSabre 1991 MISCELLANEOUS LOCATION

Component	Location
ABS Diode
VIN C	In ABS wiring harness, under left side of dash.
VIN L	In ABS wiring harness, near ABS control module.
A/C Compressor Clutch Diode	On right side of engine, in engine wiring harness.
A/C-Heater Blower Resistors	On right side of engine compartment, in blower housing. See Fig. 4 .
Air Bag Resistors	On harness, behind dash panel.
ALDL Diagnostic Connector
3.8L VIN L	Under left side of dash, to right of steering column. See Fig. 2 .
3.8L VIN C	Under left side of dash, to right of steering column. See Fig. 3 .
Cooling Fan Resistors	On fan support frame, behind radiator.
Defogger Capacitor	Behind right side of rear seat, near quarter pillar.
ECM Diode	On harness, near ECM assembly.
ECM Resistor	Behind right side of dash, in engine wiring harness.
Elect. Level Control Diode	In instrument panel wiring harness, behind radio.
Elect. Level Cntrl. Test Connector	Near top of electronic level control compressor.
Fog Light Switch Diode	Behind right side of dash, near windshield pillar.
Fuel Pump Prime/Test Connector
3.8L VIN L	Taped to wiring harness, near battery. See Fig. 2 .
3.8L VIN C	Taped to wiring harness, near battery. See Fig. 3 .
Keyless Entry Diode	On harness, behind left side of dash, near theft deterrent relay.
Power Seat Diode	In connector at front of each seat.
Power Seat Recliner Capacitor	In connector at front of each seat.
Radio Amplifier	Under right front seat.
Theft Deterrent Diode	Taped to dash wiring harness, next to theft deterrent controller.
Vehicle Speed Sensor (VSS) Buffer	Under right side of dash.