Buick Roadmaster Estate Wagon 1991 - ELECTRICAL COMPONENT LOCATOR 1991 ELECTRICAL COMPONENT LOCATIONS General Motors Corp. - Electrical Components

Buick Roadmaster Estate Wagon 1991 - BUZZERS, RELAYS & TIMERS

Buick Roadmaster Estate Wagon 1991 BUZZERS, RELAYS & TIMERS LOCATION

Component	Location
ABS Overvoltage Protection Relay
Wagon	Near center of left "D" pillar, on ABS harness.
Except Wagon	In luggage compartment, on left wheelwell.
A/C Compressor Control Relay	On bracket, on right rear of engine compartment.
A/C-Heater High Blower Relay	Under right side of dash, near blower motor.
Fuel Pump Relay	On bracket, on right rear of engine compartment. See Fig. 1 & 2.
Hazard Flasher Relay	On convenience center.
Horn Relay	On convenience center.
Power Antenna Relay	Behind left side of dash, left of convenience center.
Power Door Lock Relay	Behind left kick panel.
Rear Glass Release Relay (Wagon)	In convenience center.
Tailgate Lock Relay	Behind left kick panel.
Tailgate Window Release Relay	In convenience center.
Turn Signal Flasher Relay	In convenience center.

Buick Roadmaster Estate Wagon 1991 CIRCUIT PROTECTION DEVICES LOCATION

Component	Location
Convenience Center	On bracket, behind left side of dash.
ECM/Fuel Pump Relay In-Line Fuse	On relay bracket, on right rear of engine compartment. See Fig. 1 & 2.
Electronic Level Control Fuse	On front left side of engine compartment, on ABS harness.
Fuse Block	Under left side of dash. See Fig. 1 .
Fusible Links "A", "B", "C", "D" & "E" (Rust)	On battery junction block, on right side of engine compartment.
Power Accessory Circuit Breaker (Locks, Seats & Windows)	In fuse block.

Buick Roadmaster Estate Wagon 1991 CONTROL UNITS LOCATION

Component	Location
ABS System Module
Wagon	On lower left "D" pillar.
Except Wagon	In luggage compartment, on left wheelwell.
Audio Alarm Module	On convenience center, near parking brake pedal.
Cruise Control Module	On left rear corner of engine compartment, near master cylinder.
Diagnostic Energy Reserve Module (DERM)	Behind left side of dash, above convenience.
Electronic Control Module (ECM)	Behind right kick panel. See Fig. 1 .
Elect. Spark Control (ESC) Module	On relay bracket, on right rear of engine compartment. See Fig. 1 .
Keyless Entry Module	In luggage compartment, attached to rear shelf.
Low Coolant Warning Module	Behind right side of dash, below glove compartment.
Low Oil Warning Module	Behind right side of dash, below glove compartment.
Twilight Sentinel Control	Above base of steering column.
Vehicle Speed Sensor Module	Behind left side of dash, above convenience center.
Windshield Wiper Module	Attached to wiper motor assembly. See Fig. 2 .

Buick Roadmaster Estate Wagon 1991 SENDING UNITS & SENSORS LOCATION

Component	Location
ABS Speed Sensors
Front	Mounted on each front wheel knuckle.
Rear	Mounted on rear axle differential
Air Bag System
Forward Discriminating Sensor	On left and right side of radiator support assembly.
Anti-Theft Alarm Arming Sensor	Behind left side of dash, on right of steering column.
Coolant Temp. Sending Unit/Switch	On left side of engine block, below manifold.
Coolant Temperature Sensor	On front of engine, near thermostat housing. See Fig. 1 & 3.
Elec. Level Control Height Sensor	On center of rear crossmember.
Fuel Gauge Sending Unit	In fuel tank.
Knock Sensor	At right side of engine block, forward of starter. See Fig. 1 & 3.
Low Coolant Level Sensor	In radiator coolant reservoir tank.
Manifold Absolute Press. (MAP) Sensor	In engine compartment, above wiper motor. See Fig. 1 & 2.
Manifold Air Temp. (MAT) Sensor	In air cleaner housing. See Fig. 1 & 3.
Oil Press. Sending Unit/Switch	At rear of engine, behind distributor.
Throttle Position Sensor (TPS)	On right side of throttle of body. See Fig. 1 & 3.
Twilight Sentinel Photocell Sensor	On top of dash panel, on defrost grill. See Fig. 1 .
Vehicle Speed Sensor (VSS)	On transmission tailshaft. See Fig. 1 .

Buick Roadmaster Estate Wagon 1991 MOTORS LOCATION

Component	Location
A/C-Heater Blower Motor	Under right side of dash.
Elect. Level Control Compressor	On left side of rear crossmember.
Fuel Pump	In fuel tank, on fuel tank sending unit.
Idle Air Control (IAC) Motor	On throttle body. See Fig. 1 & 3.
Power Antenna Motor	Inside rear portion of right front fender.
Power Door Lock Motors	At rear of each door (upper right corner of tailgate).
Power Seat Motors	Under each seat.
Power Seat Recliner Motors	Under inner side of seat back.
Power Window Motors	In lower front of each door (inside left center of tailgate).
Wiper Motor
Rear Window (Wagon)	On rear header, above tailgate opening.
Windshield	In engine compartment, on center of firewall. See Fig. 2 .

Buick Roadmaster Estate Wagon 1991 SOLENOIDS & SOLENOID VALVES LOCATION

Component	Location
AIR Diverter Valve Solenoid	On diverter valve, behind A/C compressor. See Fig. 1 & 3.
Canister Purge Solenoid	At left front corner of engine compartment, on vapor canister. See Fig. 1 .
EGR Solenoid	At right rear corner of engine, near distributor. See Fig. 1 & 3.
Luggage Comp. Release Solenoid	At rear center of trunk lid.
Rear Glass Release Solenoid	On center of tailgate.
Torque Conv. Clutch (TCC) Solenoid	In transmission case. See Fig. 1 .

Buick Roadmaster Estate Wagon 1991 SWITCHES LOCATION

Component	Location
A/C Compressor Cut-Out Switch	On accelerator pedal bracket.
A/C Pressure Cycling Switch	On A/C on accumulator. See Fig. 2 .
Brakelight/Cruise Release Switch	On brake pedal support.
Brake Pressure Switch	On brake master cylinder.
Fuel Pump/Oil Pressure Switch	On lower left rear of engine block.
Gear Selector Switch	On lower portion of steering column.
Oil Pressure Switch	On lower left rear of engine. See Fig. 1 .
Park/Neutral Start Switch (A/T)	On transmission housing.
Parking Brake Switch	Attached to top of parking brake assembly.
Power Steering Press. Switch (PSPS)	In pressure line, near power steering unit. See Fig. 1 .
Seat Belt Switch	Part of driver's seat belt assembly.
Tailgate Ajar Switch	Inside lower right corner of tailgate assembly.
TCC/Cruise Release Switch	On brake pedal support.
Washer Fluid Level Switch	In windshield washer reservoir.

Buick Roadmaster Estate Wagon 1991 MISCELLANEOUS LOCATION

Component	Location
ABS Resistor	Behind left side of dash, above parking brake pedal.
A/C Compressor Clutch Diode	Taped inside compressor clutch connector.
A/C-Heater Blower Resistor	Behind right side of dash near blower motor.
ALDL Diagnostic Connector	Under left side of dash, to right of steering column. See Fig. 1 .
Circuit Isolation Diode	On turn/hazard switch harness connector breakout branch.
Fuel Pump Prime/Test Connector	Taped to wiring harness, by fuel pump relay. See Fig. 1 & 2.
Set Timing Connector	On wiring harness, on right side of engine. See Fig. 1 & 3.
Vehicle Speed Sensor Buffer	Taped to wiring harness, near fuse block. See Fig. 1 .