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

Buick Skylark 1991 - BUZZERS, RELAYS & TIMERS

Buick Skylark 1991 BUZZERS, RELAYS & TIMERS LOCATION

Component	Location
ABS Enable Relay	On relay bracket, at center of firewall, in engine compartment.
A/C Compressor Relay
2.3L VIN "A" & "D"	On relay bracket, at center of firewall, in engine compartment. See Fig. 1.
2.5L VIN "U"	On relay bracket, at center of firewall, in engine compartment. See Fig. 2.
3.3L VIN "N"	On relay bracket, at center of firewall, in engine compartment. See Fig. 3.
A/C-Heater High Blower Relay
2.3L VIN "A" & "D"	On relay bracket, at center of firewall, in engine compartment. See Fig. 1.
3.3L VIN "N"	On relay bracket, at center of firewall, in engine compartment. See Fig. 3.
VIN "U"	Center of dash on relay bracket.
Cooling Fan Relay
2.3L VIN "A" & "D"	On relay bracket, at center of firewall in engine compartment. See Fig. 1.
2.5L VIN "U"	On relay bracket, at center of firewall in engine compartment. See Fig. 2.
3.3L VIN "N"	On relay bracket, at center of firewall in engine compartment. See Fig. 3.
Defogger Timer Relay
Cutlass Calais	Behind right side of dash, below speaker.
Grand Am	Behind left side of dash, near fuse box.
Skylark	Integrated with rear defogger control switch.
Door Lock Relay	Behind right side of instrument panel.
Fog Light Relay	On left front inner fender panel, in front of strut tower.
Fuel Pump Relay
2.3L VIN "A" & "D"	On relay bracket, at center of firewall, in engine compartment. See Fig. 1.
2.5L VIN "U"	On relay bracket, at center of firewall, in engine compartment. See Fig. 2.
3.3L VIN "N"	On relay bracket, at center of firewall, in engine compartment. See Fig. 3.
Hazard Flasher Relay
Except Grand Am	In convenience center.
Grand Am	Behind center of dash, behind radio.
Horn Relay
Except Grand Am	In convenience center left of steering column.
Grand Am	On bracket, above fuse block.
Illumination Control Relay	Behind center of dash, in front of console.
Power Antenna Relay
Cutlass Calais	Behind right side of dash, below speaker.
Grand Am	Behind right side of dash, to right of glove box.
Skylark	At right side of luggage compartment.
Turn Signal Flasher Relay
Skylark	Under left side of dash, right of steering column.
Except Skylark	Under left side of dash, left of steering column.

Buick Skylark 1991 - CIRCUIT PROTECTION DEVICES

Buick Skylark 1991 CIRCUIT PROTECTION DEVICES LOCATION

Component	Location
Convenience Center (Except Grand Am)	Under left side of dash, above fuse block.
ECM Power Fuse	At starter solenoid. See Fig. 1.
ECM Power Connector	On battery positive terminal pigtail. See Fig. 2.
Fuse Block
2.3L VIN "A" & "D"	Under left side of dash, to left of steering column. See Fig. 1.
2.5L VIN "U"	Under left side of dash, to left of steering column. See Fig. 2.
3.3L VIN "N"	Under left side of dash, to left of steering column. See Fig. 3.
Fusible Link Junction Block (2.3L)	At left shock tower.
Fusible Links
Accessories (Rust)	At starter solenoid or fusible link junction block.
A/C-Heater High Blower Relay (Rust)	At starter solenoid or fusible link junction block.
Alternator
2.3L (Rust)	At fusible link junction block.
Except 2.3L (Blue & Gray)	At starter solenoid.
Cooling Fan Relay
2.3L (Rust)	At fusible link junction block.
Except 2.3L (Blue & Gray)	At starter solenoid.
ECM (Gray)	On battery positive terminal pigtail. See Fig. 3.
Fog Lights (Gray or Orange)	At starter solenoid or fusible link junction block.
Ignition Switch (Rust)	At starter solenoid or fusible link junction block.
Power Accessory Circuit Breaker	In fuse block.
Power Window Circuit Breaker	In fuse block.

Buick Skylark 1991 - CONTROL UNITS

Buick Skylark 1991 CONTROL UNITS LOCATION

Component	Location
ABS Module	Under right front of dash.
Cruise Control Module	Under left side of dash, above kick panel.
Direct Ignition System (DIS) Module (2.5L)	Mounted to rear of engine block. See Fig. 2.
Electronic Control Module (ECM)
2.3L VIN "A" & "D"	Behind glove box. See Fig. 1.
2.5L VIN "U"	Behind glove box. See Fig. 2.
3.3L VIN "N"	Behind glove box. See Fig. 3.
Electronic Variable Orifice (EVO) Steering Controller	Behind right side of dash, left of speaker.
Lights Monitor Module	Behind center of dash, behind radio.
Multifunction Alarm Module
Grand Am	Behind right side of dash, above glove box.
Except Grand Am	On convenience center, left of steering column.
Power Window Control Module	In driver's door.
Remote Dimmer Module
Except Grand AM	On bracket, on left of steering column.
Grand Am	On bracket, on right of steering column.
Remote Keyless Entry Module	In luggage compartment, above left wheelwell.

Buick Skylark 1991 - SENDING UNITS & SENSORS

Buick Skylark 1991 SENDING UNITS & SENSORS LOCATION

Component	Location
ABS Wheel Sensors	At each wheel assembly.
A/C Refrigerant Pressure Sensor	At right front side of engine compartment, near radiator.
A/C Refrigerant Temperature Sensor	On discharge line, at A/C condenser.
Coolant Temperature Sending Unit/Switch
2.3L	At left rear of engine behind coolant outlet.
2.5L	At right rear corner of cylinder head.
3.3L	At right side of engine, behind alternator.
Coolant Temperature Sensor (CTS)
2.3L	At left rear of engine, behind coolant outlet. See Fig. 1.
2.5L	At left front of engine, below coolant outlet. See Fig. 2.
3.3L	At right front of engine, behind alternator. See Fig. 3.
Crankshaft Position Sensor
2.3L	At lower left front of engine, above oil filter.
2.5L	Part of Direct Ignition System (DIS) Module, mounted on rear of engine. See Fig. 2.
3.3L	At lower right front of engine, behind crankshaft pulley.
Dual Crank Sensor (3.3L)	At top right side of engine. See Fig. 3.
Knock Sensor
2.3L	At lower left corner of engine block. See Fig. 1.
3.3L	At lower right front of engine block, behind oil pressure switch. See Fig. 3.
Manifold Absolute Press. (MAP) Sensor
2.3L	On top left front of engine intake manifold. See Fig. 1.
2.5L	On air cleaner housing. See Fig. 2.
Manifold Air Temp. (MAT) Sensor
2.3L	On top left front of engine on intake manifold. See Fig. 1.
2.5L	In intake manifold, below throttle body. See Fig. 2.
Mass Airflow (MAF) Sensor (3.3L)	On left side of throttle body. See Fig. 3.
Throttle Position Sensor (TPS)
2.3L VIN "A" & "D"	On throttle body. See Fig. 1.
2.5L VIN "U"	On throttle body. See Fig. 2.
3.3L VIN "N"	On throttle body. See Fig. 3.
Vehicle Speed Sensor (VSS)
2.3L VIN "A" & "D"	At rear of engine, on transaxle. See Fig. 1.
2.5L VIN "U"	At rear of engine, on transaxle. See Fig. 2.
3.3L VIN "N"	At rear of engine, on transaxle. See Fig. 3.

Buick Skylark 1991 - MOTORS

Buick Skylark 1991 MOTORS LOCATION

Component	Location
A/C-Heater Blower Motor	At right side of firewall, in engine compartment.
Idle Air Control (IAC) Motor
2.3L VIN "A" & "D"	On throttle body. See Fig. 1.
2.5L VIN "U"	On throttle body. See Fig. 2.
3.3L VIN "N"	On throttle body. See Fig. 3.
Power Antenna Motor	At base of antenna.
Power Door Lock Motor	One in each door.
Power Mirror Motor	In each mirror assembly.
Power Seat Motor	Under driver's seat.
Power Window Motor	One in each door.
Windshield Wiper Motor	On left side of firewall, in engine compartment.

Buick Skylark 1991 - SOLENOIDS & SOLENOID VALVES

Buick Skylark 1991 SOLENOIDS & SOLENOID VALVES LOCATION

Component	Location
ABS Solenoid (Front)	On master cylinder.
Brake Cruise Release Sol. Valve	On brake pedal support.
Canister Purge Solenoid
2.3L VIN "A" & "D"	On vapor canister, or in vapor purge hose. See Fig. 1.
3.3L VIN "N"	On vapor canister, or in vapor purge hose. See Fig. 3.
Electronic Variable Orifice (EVO) Steering Solenoid	Top left of engine, behind power steering pump.
Luggage Compartment Release Solenoid	In center of luggage compartment, on latch assembly.
Seat Belt Lap Retractor Solenoid	In lower rear of each front door.
Seat Belt Shoulder Retractor Solenoid	In upper rear of each front door.
Torque Converter Clutch (TCC) Solenoid	On transaxle valve body.

Buick Skylark 1991 - SWITCHES

Buick Skylark 1991 SWITCHES LOCATION

Component	Location
A/C High Pressure Switch	On back of A/C compressor. See Fig. 2.
A/C Low Pressure Switch	On back of A/C compressor. See Fig. 2.
A/C Press. Cycling Switch	On A/C accumulator.
Auto. Seat Belt Retractor Switch	One in rear of each door, on latch assembly.
Back-Up Light Switch	On transaxle.
Brake Fluid Level Switch	In brake master cylinder reservoir.
Brake Pressure Switch	At front left side of master cylinder.
Brake/Stoplight Switch	On brake pedal support.
Clutch Start Switch	On clutch pedal support.
Coolant Level Switch	In coolant reservoir.
Door Ajar Switch	One in each door jamb.
Fuel Pump/Oil Pressure Switch
2.3L	On top left side of engine.
2.5L	On lower rear of engine, near DIS.
3.3L	On lower right front of engine
Gear Selector Switch (A/T)	In console, at base of shifter lever.
Hood Ajar Switch	On top left side of radiator bracket.
Park/Neutral (P/N) Switch
2.3L VIN "A" & "D"	On left rear of transaxle. See Fig. 1.
2.5L VIN "U"	On left rear of transaxle. See Fig. 2.
3.3L VIN "N"	On left rear of transaxle. See Fig. 3.
Parking Brake Switch	In console, at base of parking brake lever.
Power Steering Press. Switch (PSPS)
2.5L	In power steering pressure line, near left of brake booster. See Fig. 2.
3.3L	In power steering pressure line, near coolant outlet. See Fig. 3.
Seat Belt Switch	In driver's seat belt buckle assembly.
Windshield Washer Fluid Level Switch	In fluid reservoir.

Buick Skylark 1991 - MISCELLANEOUS

Buick Skylark 1991 MISCELLANEOUS LOCATION

Component	Location
A/C Compressor Clutch Diode	In A/C compressor clutch connector.
A/C-Heater Blower Resistors	On right side of firewall, on blower assembly.
ALDL Diagnostic Connector
2.3L VIN "A" & "D"	On left side of dash, below steering column. See Fig. 1.
2.5L VIN "U"	On left side of dash, below steering column. See Fig. 2.
3.3L VIN "N"	On left side of dash, below steering column. See Fig. 3.
Fuel Pump Prime/Test Connector
2.3L VIN "A" & "D"	In harness, behind left shock tower. See Fig. 1.
2.5L VIN "U"	In harness, behind left shock tower. See Fig. 2.
3.3L VIN "N"	In harness, behind left shock tower. See Fig. 3.
Injector In-Line Resistor (3.3L)	On right side of engine compartment.
Vehicle Speed Sensor (VSS) Buffer	Behind right side of dash, in ECM.