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

Buick Riviera 1991 - BUZZERS, RELAYS & TIMERS

Buick Riviera 1991 BUZZERS, RELAYS & TIMERS LOCATION

Component	Location
ABS System
Main Relay	On left front corner of engine compartment, on ABS modulator.
Pump Motor Relay	On left front corner of engine compartment, on ABS modulator.
A/C Clutch Control Relay	In underhood relay block.
Convertible Top (Reatta)
Pull-Down Motor Relay	Below convertible top cover, on left sheerwall.
Release Relay	Below convertible top cover, on right sheerwall.
Convertible Top (Reatta)
Pull-Down Logic Relay	In front of right rear wheelwell, near micro relay center.
Pull-Down Motor Relay	Below tonneau cover, near left sheerwall.
Cooling Fan Relays	In underhood relay center.
Fog Light Relay (Reatta)	In interior relay center.
Fuel Pump Relay
Reatta & Riviera	In interior relay center. See Fig. 1 .
Toronado & Trofeo	In micro relay center No. 1.
Hazard Flasher Relay	Under left side of dash, on right side of steering column support.
Headlight Relay
Reatta	Taped to fuse block wiring harness.
Riviera	In interior relay center.
Horn Relay	In underhood relay block.
Park Light Relay	In interior relay center.
Power Antenna Relay	In right side of trunk, on antenna assembly.
Power Door Lock Relay	Behind left kick panel.
Starter Enable Relay	Under left side of dash, near steering column.
Sunroof Relays	On center of header harness, near sunroof actuator assembly.
Theft Deterrent Relay	Under left side of dash, left of steering column support.
Turn Signal Flasher Relay	On right side of steering column support.

Buick Riviera 1991 - CIRCUIT PROTECTION DEVICES

Buick Riviera 1991 CIRCUIT PROTECTION DEVICES LOCATION

Component	Location
Circuit Breakers
Convertible Top Bow (Reatta)	In front of right rear wheelwell, below micro relay center.
Headlights (Toronado & Trofeo)	In fuse block.
High Beam (Reatta & Riviera)	In fuse block.
Horn/Defogger	In fuse block.
Low Beam (Reatta & Riviera)	In fuse block.
Power Seats	In fuse block.
Power Windows	In fuse block.
Retained Accessory Power	In fuse block.
Fuse Block
Reatta & Riviera	Below center of dash, on left front side of console. See Fig. 1 .
Toronado & Trofeo	Inside glove compartment. See Fig. 2 .
Fusible Links	In power junction block, behind battery.
Relay Centers
Reatta & Riviera
Micro Relay Center
Reatta Convertible	Below tonneau cover, in front of right rear wheelwell.
Reatta Coupe	In right side of trunk, rear of wheelwell
Riviera	In center front of trunk, below rear shelf.
Underdash Relay Center	Below center of dash, on right front of console. See Fig. 1 .
Underhood Relay Center	On left front of engine compartment, behind washer fluid reservoir. See Fig. 1 .
Toronado & Trofeo
Micro Relay Center No. 1	Behind right side of dash, by glove box. See Fig. 2 .
Micro Relay Center No. 2	Below rear shelf, in luggage compartment.
Underhood Relay Center	On left front of engine compartment, behind headlights. See Fig. 2 .

Buick Riviera 1991 - CONTROL UNITS

Buick Riviera 1991 CONTROL UNITS LOCATION

Component	Location
ABS System
Control Module	In luggage compartment, on left rear wheelwell.
Modulator	Behind left upper radiator support.
Air Bag System
Initiator Module	In steering wheel pad assembly.
Resistor Module	Behind left side of dash, above parking brake.
Body Control Module (BCM)	Under right side of dash, behind glove compartment.
Cathode Ray Tube Controller	In console, below radio.
Diagnostic Energy Reserve Module (DERM)	Behind dash, on right of steering column.
Electronic Compass Module	In luggage compartment, under rear shelf.
HVAC Power Module	In center of dash, in A/C-heater module.
HVAC Programmer	Behind center of dash, on right side of plenum.
Headlight Door Control Module	In front left corner of engine compartment, behind headlight.
Heated Windshield
Control Module	Behind left side of dash, left of steering column.
Power Module	On right rear of engine compartment firewall.
Ignition Coil & Module	On right front of engine.
Keyless Entry Module
Reatta Convertible	Below convertible top, along center of rear shelf.
Reatta Coupe	Behind left rear door sill.
Riviera, Toronado & Trofeo	Under center of rear package shelf, in luggage compartment.
Pass Key Decoder Module	Behind dash, left of steering column.
Power Window (Express Down) Module	On rear of left front door.
Powertrain Control Module (PCM)
Reatta & Riviera	Behind right side of dash, left of A/C-heater programmer. See Fig. 1 .
Toronado & Trofeo	Behind right side of dash, left of A/C-heater programmer. See Fig. 2 .
Steering Wheel Radio & HVAC Control Interface Module	On base of steering column.
Seat Control Module	In center console, near seat air pump assembly.
Theft Deterrent Module	Under left side of dash, left of steering column.

Buick Riviera 1991 - SENDING UNITS/SENSORS

Buick Riviera 1991 SENDING UNITS/SENSORS LOCATION

Component	Location
ABS Wheel Speed Sensor	On each wheel spindle.
A/C System
High Side Temp. Sensor
Reatta & Riviera	In A/C high side line, left of blower motor. See Fig. 1 .
Toronado & Trofeo	In A/C high side line, left of blower motor. See Fig. 2 .
In-Car Temp. Sensor	Behind right side of dash above glove compartment.
Low Side Temp. Sensor	In A/C low side line, on right side of firewall.
Outside Temp. Sensor	On bottom of upper radiator support.
Air Bag System
Dual Sensor	Behind right side of dash, left of glove compartment.
Forward Discriminating Sensor	On front center of engine compartment, near hood latch.
Camshaft Sensor
Reatta & Riviera	On lower right side of engine, below water pump. See Fig. 1 .
Toronado & Trofeo	On lower right side of engine, below water pump. See Fig. 2 .
Coolant Temperature Sensor
Reatta & Riviera	On top left side of engine, under throttle body. See Fig. 1 .
Toronado & Trofeo	On top left side of engine, under throttle body. See Fig. 2 .
Crankshaft Sensor
Reatta & Riviera	On lower right side of engine, right of damper. See Fig. 1 .
Toronado & Trofeo	On lower right side of engine, right of damper. See Fig. 2 .
Elec. Level Control Height Sensor	Under rear of vehicle, on lower suspension arm.
Knock Sensor
Reatta & Riviera	On lower right side of engine, above right drive axle. See Fig. 1 .
Toronado & Trofeo	On lower right side of engine, above right drive axle. See Fig. 2 .
Manifold Air Temp. (MAT) Sensor
Reatta & Riviera	On air cleaner assembly. See Fig. 1 .
Toronado & Trofeo	On air cleaner assembly. See Fig. 2 .
Mass Airflow (MAF) Sensor
Reatta & Riviera	On air intake assembly, on top left of engine. See Fig. 1 .
Toronado & Trofeo	On air intake assembly, to left of engine. See Fig. 2 .
Oil Level Sensor	On lower left front of engine, below starter solenoid.
Oil Pressure Sensor/Switch
Reatta & Riviera	On lower right front side of engine. See Fig. 1 .
Toronado & Trofeo	On lower right front side of engine. See Fig. 2 .
Sun Load Sensor	On top center of dash.
Throttle Position Sensor (TPS)
Reatta & Riviera	In front of throttle body, below MAF sensor. See Fig. 1 .
Toronado & Trofeo	In front of throttle body, below MAF sensor. See Fig. 2 .
Vehicle Speed Sensor
Reatta & Riviera	On top right side of transaxle. See Fig. 1 .
Toronado & Trofeo	On top right side of transaxle. See Fig. 2 .

Buick Riviera 1991 - MOTORS

Buick Riviera 1991 MOTORS LOCATION

Component	Location
ABS Pump Motor	On left side of firewall.
A/C-Heater Blower Motor	On right side of firewall, in engine compartment.
Electric Fuel Pump	In fuel tank.
Elec. Level Control Compressor	Under rear of vehicle, at left rear crossmember.
Headlight Door Motors	Ahead of radiator, at front of engine compartment.
Idle Air Control (IAC) Motor
Reatta & Riviera	On rear of throttle body. See Fig. 1 .
Toronado & Trofeo	On rear of throttle body. See Fig. 2 .
Power Door Lock Motor	One at lower rear of each door.
Power Mirror Motor	Two in each outside mirror.
Power Seat Motor	Below front portion of front seats.
Power Window Motors	One in lower front portion of each door.
Sun Roof Motor	In center of windshield header area.
Trunk Pull-Down Motor	Near latch, at center of luggage compartment lid.

Buick Riviera 1991 - SOLENOIDS/SOLENOID VALVES

Buick Riviera 1991 SOLENOIDS/SOLENOID VALVES LOCATION

Component	Location
Canister Purge Solenoid
Reatta & Riviera	On vapor canister, in left front corner of engine compartment. See Fig. 1 .
Toronado & Trofeo	On vapor canister, in left front corner of engine compartment. See Fig. 2 .
Convertible Top Release Solenoid	Below tonneau cover, on left & right sheerwall.
EGR Solenoid	At left rear of engine, on valve cover.
Fuel Filler Door Release Solenoid	In left side of luggage compartment, above wheelwell.
Luggage Compartment Release Solenoid	At rear center of luggage compartment lid, on lock assembly.

Buick Riviera 1991 - SWITCHES

Buick Riviera 1991 SWITCHES LOCATION

Component	Location
A/C System
High Pressure Switch	On A/C line, at left front corner of engine compartment.
Low Pressure Switch	On A/C line, at right of blower motor.
Brake/Cruise/Stoplight/Torque Converter Switch	On brake pedal support.
Convertible Top Ajar Switch	Below convertible top cover, near right sheerwall.
Cooling Fan Temp. Switch	On top right side of engine, near alternator.
Door Ajar Switch	In respective doors, at end of door lock module assembly.
Low Brake Fluid Switch	In brake fluid reservoir.
Oil Level Switch	On lower left front of engine, near starter solenoid.
PRNDL Switch
Reatta & Riviera	At left rear of engine compartment, on top of transaxle. See Fig. 1 .
Toronado & Trofeo	At left rear of engine compartment, on top of transaxle. See Fig. 2 .
Parking Brake Switch	On parking brake assembly.
Power Steering Pressure Switch	On power steering box, at rear of engine.
Rear Defogger Cut-Off Switch	On right front of trunk, above micro relay center.
Seat Belt Switch	Part of driver's seat belt assembly.
Transaxle Position Switch	On left rear of engine, top of transaxle.
Washer Fluid Level Switch	In windshield washer reservoir.

Buick Riviera 1991 - MISCELLANEOUS

Buick Riviera 1991 MISCELLANEOUS LOCATION

Component	Location
ABS Switch Capacitors
No. 1	Behind left side of dash, in brake switch connector.
No. 2	In wiring harness, right of steering column, near hazard flasher.
A/C Compressor Clutch Diode	Taped in engine harness, near A/C compressor clutch.
ALDL Diagnostic Connector	Behind left side of dash, above parking brake pedal.
Diode Array Module	Behind right side of dash, near BCM.
Fuel Pump Test Connector
Reatta & Riviera	Left side of engine compartment, left of cruise control servo. See Fig. 1 .
Toronado & Trofeo	Left side of engine compartment, left of cruise control servo. See Fig. 2 .
Keyless Entry Vehicle
Access Code Connector
Reatta Convertible	Below tonneau cover, along center of rear shelf.
Reatta Coupe	On left rear of passenger compartment, in front of wheelwell
Riviera, Toronado & Trofeo	Under center of rear shelf, below keyless entry module.
Lumbar Compressor Capacitor	Below each front seat, at lumbar support compressor.
Park/Turn Light Resistor (Front)	In front of radiator, right of headlight.
Power Seat Motor Capacitor	In left front seat electrical connector.
Twilight Sentinel Photocell	On top center of dash pad.