Buick Riviera 1990 - ELECTRICAL COMPONENT LOCATOR 1990 ELECTRICAL COMPONENT LOCATIONS General Motors Corp. - Electrical Components

Buick Riviera 1990 - BUZZERS, RELAYS & TIMERS

Buick Riviera 1990 BUZZERS, RELAYS & TIMERS LOCATION

Component	Location
ABS Main Relay	On center of firewall, on relay bracket. See Fig. 1 .
ABS Pump Motor Relay	On center of firewall, to right of ABS main relay. See Fig. 1 .
Convertible Top (Reatta)
Pull-Down Motor Relay	Below convertible top cover, on left sheerwall.
Release Relay	Below convertible top cover, on right sheerwall.
Cooling Fan Relays	In underhood fuse/relay block.
Fuel Pump Relay
Reatta & Riviera	Behind center of dash, near fuse block. See Fig. 2 .
Toronado & Trofeo	On center of firewall, on relay bracket. See Fig. 3 .
Hazard Flasher Relay	Under left side of dash, on right side of steering column support.
Parking Light Relay	In front of console, near interior relay center.
Power Antenna Relay	In right side of trunk, on antenna assembly.
Power Door Lock Relay	Behind left kick panel.
Starter Interrupt Relay	Under left side of dash, near steering column.
Sunroof Relays (Reatta)	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 1990 - CIRCUIT PROTECTION DEVICES

Buick Riviera 1990 CIRCUIT PROTECTION DEVICES LOCATION

Component	Location
ABS Controller Fuse	Behind dash, to right of steering column.
ABS Main Relay Fuse	On firewall, above ABS main relay. See Fig. 1 .
ABS Pump Relay Fuse	In harness, behind dash and above brake pedal.
Circuit Breakers
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.
Convertible Top Bow Circuit Breaker (Reatta)	Below tonneau cover, in front of right rear wheelwell.
Fuse Block
Reatta & Riviera	Below center of dash, on left front side of console. See Fig. 2 .
Toronado & Trofeo	Behind right side of dash, left of glove box. See Fig. 3 .
Fusible Links	In power junction block, behind battery.
Relay Blocks
Reatta & Riviera
Underdash Relay Center	Below center of dash, on right front of console. See Fig. 2 .
Micro Relay Center
Reatta Convertible	Below tonneau cover, on right sheerwall.
Except Reatta Convertible	Below center of rear shield, in luggage compartment.
Underhood Relay Center	On left front of engine compartment, behind washer fluid reservoir. See Fig. 2 .
Toronado & Trofeo
Micro Relay Center No. 1	Behind right side of dash, by glove box.
Micro Relay Center No. 2	Below rear shelf, in luggage compartment.
Underhood Relay Center	On left front of engine compartment, behind headlights. See Fig. 3 .

Buick Riviera 1990 - CONTROL UNITS

Buick Riviera 1990 CONTROL UNITS LOCATION

Component	Location
ABS Control Module	In luggage compartment, on left rear wheelwell.
A/C Blower Control Power Module	Behind center of dash, in A/C heater module. See Fig. 4 .
Body Control Module (BCM)	Under right side of dash, above glove box.
Cathode Ray Tube Controller	In console, below radio.
Chime Module
Reatta & Riviera	Under left side of dash, above park brake pedal.
Toronado & Trofeo	Under left side of dash, above park brake pedal.
Diagnostic/Energy Reserve Module (DERM)	Behind dash, on right of steering column.
Elect. Climate Control Programmer	Under right side of dash, on right side of plenum.
Electronic Compass Module	In luggage compartment, under rear shelf.
Electronic Control Module (ECM)
Reatta & Riviera	Behind right side of dash, to left of A/C-heater programmer. See Fig. 2 .
Toronado & Trofeo	Behind right side of dash, to left of A/C-heater programmer. See Fig. 3 .
Headlight Door Control Module	In front left corner of engine compartment, behind headlight.
Ignition Coil & Module
Reatta & Riviera	On right front of engine. See Fig. 2 .
Toronado & Trofeo	On right front of engine. See Fig. 3 .
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.
SIR Initiator Module	In steering wheel pad assembly.
SIR Resistor Module	Behind left side of dash, above parking brake.
Theft Deterrent Module	Under left side of dash, to left of steering column.

Buick Riviera 1990 - SENDING UNITS/SENSORS

Buick Riviera 1990 SENDING UNITS/SENSORS LOCATION

Component	Location
ABS Wheel Speed Sensor	On each wheel spindle.
A/C High Side Temp. Sensor	In A/C high side line, on firewall above blower motor. See Fig. 4 .
A/C In-Car Temp. Sensor	Behind right side of dash.
A/C Low Side Temp. Sensor	In A/C low side line, on right side of firewall. See Fig. 4 .
Camshaft Sensor (Engine Compartment)
Reatta & Riviera	On lower right side of engine, below water pump. See Fig. 2 .
Toronado & Trofeo	On lower right side of engine, below water pump. See Fig. 3 .
Camshaft Sensor Location (Engine)	On lower right side of engine, below water pump. See Fig. 5 .
Coolant Temperature Sensor
Reatta & Riviera	On top left side of engine, under throttle body. See Fig. 2 .
Toronado & Trofeo	On top left side of engine, under throttle body. See Fig. 3 .
Crankshaft Sensor
Reatta & Riviera	On lower right side of engine, to right of damper. See Fig. 2 .
Toronado & Trofeo	On lower right side of engine, to right of damper. See Fig. 3 .
Elect. Level Control Height Sensor	Under rear of vehicle, on lower suspension arm.
Fuel Gauge Sending Unit	In fuel tank.
Knock Sensor
Reatta & Riviera	On lower right side of engine, above right drive axle. See Fig. 2 .
Toronado & Trofeo	On lower right side of engine, above right drive axle. See Fig. 3 .
Knock Sensor Location	On lower right side of engine, above right drive axle. See Fig. 5 .
Manifold Air Temp. (MAT) Sensor
Toronado & Trofeo	On air intake assembly, to left of engine. See Fig. 3 .
MAT Sensor Location	On air intake assembly, to left of engine. See Fig. 6 .
Mass Airflow (MAF) Sensor
Reatta & Riviera	On air intake assembly, to left of engine. See Fig. 2 .
Toronado & Trofeo	On air intake assembly, to left of engine. See Fig. 3 .
MAF Sensor Location	On air intake assembly, to left of engine. See Fig. 6 .
Oil Pressure Sensor/Switch
Reatta & Riviera	On lower right front side of engine. See Fig. 2 .
Toronado & Trofeo	On lower right front side of engine. See Fig. 3 .
Oil Pressure Sensor/Switch Location	On lower right front side of engine. See Fig. 5 .
Outside Temperature Sensor	On bottom of upper radiator support.
Oxygen (O2) Sensor
Reatta & Riviera	In exhaust manifold. See Fig. 2 .
Toronado & Trofeo	In exhaust manifold. See Fig. 3 .
SIR Dual Sensor	Behind right side of dash, left of glove compartment.
SIR Forward Discriminating Sensor	On front center of engine compartment.
Sun Load Sensor	On top center of dash.
Throttle Position Sensor (TPS)
Reatta & Riviera	On top left side of engine, on throttle body. See Fig. 2 .
Toronado & Trofeo	On top left side of engine, on throttle body. See Fig. 3 .
TPS Sensor Location	On top left side of engine, on throttle body. See Fig. 6 .
Vehicle Speed Sensor
Reatta & Riviera	On top right side of transaxle. See Fig. 2 .
Toronado & Trofeo	On top right side of transaxle. See Fig. 3 .
Vehicle Speed Sensor Location	On top right side of transaxle. See Fig. 5 .

Buick Riviera 1990 - MOTORS

Buick Riviera 1990 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. See Fig. 4 .
Electric Fuel Pump	In fuel tank.
Elect. 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 Motor	On rear of throttle body.
Power Antenna Motor	In luggage compartment, at right wheelwell.
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 1990 - SOLENOIDS/SOLENOID VALVES

Buick Riviera 1990 SOLENOIDS/SOLENOID VALVES LOCATION

Component	Location
Canister Purge Solenoid
Reatta & Riviera	On vapor canister, in left front corner of engine compartment. See Fig. 2 .
Toronado & Trofeo	On vapor canister, in left front corner of engine compartment. See Fig. 3 .
Convertible Top Release Solenoid	Below tonneau cover, on left & right sheerwall.
EGR Solenoid
Reatta & Riviera	At left rear of engine, on valve cover. See Fig. 2 .
Toronado & Trofeo	At left rear of engine, on valve cover. See Fig. 3 .
Fuel Filler Door Release Solenoid	In left side of luggage compartment, above wheelwell.
Idle Air Control (IAC) Valve
Reatta & Riviera	On throttle body. See Fig. 2 .
Toronado & Trofeo	On throttle body. See Fig. 3 .
Luggage Compartment Release Solenoid	At rear center of luggage compartment lid, on lock assembly.

Buick Riviera 1990 - SWITCHES

Buick Riviera 1990 SWITCHES LOCATION

Component	Location
A/C High Pressure Switch	On A/C line, at left front corner of engine compartment.
A/C Low Pressure Switch	On A/C line, at right of blower motor. See Fig. 4 .
Brake/Cruise/Stoplight/Torque Converter Switch	On brake pedal support.
Cooling Fan Temp. Switch	On top right side of engine, near alternator.
Low Brake Fluid Switch	On brake fluid reservoir.
Oil Level Switch	On lower left front of engine, near starter solenoid.
Parking Brake Switch	On parking brake assembly.
Park/Neutral Switch
Reatta & Riviera	At left rear of engine compartment, on top of transaxle. See Fig. 2 .
Toronado & Trofeo	At left rear of engine compartment, on top of transaxle. See Fig. 3 .
Power Steering Pressure Switch
Reatta & Riviera	On power steering box, at rear of engine. See Fig. 2 .
Toronado & Trofeo	On power steering box, at rear of engine. See Fig. 3 .
Seat Belt Switch	Part of driver's seat belt assembly.
Washer Fluid Level Switch	In windshield washer reservoir.

Buick Riviera 1990 - MISCELLANEOUS

Buick Riviera 1990 MISCELLANEOUS LOCATION

Component	Location
ABS Diode	In left side of trunk, forward of ABS module.
A/C Compressor Clutch Diode	In connector, at compressor clutch.
ALDL Diagnostic Connector	Behind left side of dash, above parking brake pedal.
Brake Switch Capacitor
No. 1	Behind left side of dash, in brake switch connector.
No. 2	In wiring harness, right of steering column.
Central Power Supply (CPS)
Riviera & Reatta	Below center of instrument panel, front of console.
Toronado & Trofeo	Under rear of console.
Daytime Running Lights Relay	On left front of engine compartment, near underhood relay center.
Fuel Pump Test Connector
Reatta & Riviera	In wiring harness, near underhood relay/fuse center. See Fig. 2 .
Toronado & Trofeo	In wiring harness, near underhood relay/fuse center. See Fig. 3 .
Fuel Pump Test Connector Location	In wiring harness, near underhood relay/fuse center. See Fig. 6 .
Keyless Entry Vehicle Access Code Connector
Reatta	In left side of trunk, on top of left rear wheel housing.
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, to right of headlight.
Power Seat Capacitor	In left front seat electrical connector.
Twilight Sentinel Photocell	On top center of dash pad.