Buick Skylark Custom 1990 - 1989-90 ELECTRICAL COMPONENT LOCATOR Electrical Component Location - General Motors Corp.

Buick Skylark Custom 1990 - BUZZERS, RELAYS & TIMERS

Buick Skylark Custom 1990 BUZZERS, RELAYS & TIMERS LOCATION

Component	Location
A/C Comp. Control Relay
2.0L (1989)	On relay bracket, at center of firewall. See Fig. 1.
2.3L (1989)	On relay bracket, at center of firewall. See Fig. 2.
2.3L (1990)	On relay bracket, at center of firewall. See Fig. 3.
2.5L	On relay bracket, at center of firewall. See Fig. 4.
3.3L	On relay bracket, at center of firewall. See Fig. 5.
Component View (All Engines)	On relay bracket, at center of firewall. See Fig. 6.
A/C-Heater High Blower Relay
2.3L (1989)	On relay bracket, at center of firewall. See Fig. 2.
2.3L (1990)	On relay bracket, at center of firewall. See Fig. 3.
3.3L (1989)	On relay bracket, at center of firewall. See Fig. 5.
Component View (All Engines)	On relay bracket, at center of firewall. See Fig. 6.
Cooling Fan Relay
2.0L (1989)	On relay bracket, at center of firewall. See Fig. 1.
2.3L (1989)	On relay bracket, at center of firewall. See Fig. 2.
2.3L (1990)	On relay bracket, at center of firewall. See Fig. 3.
2.5L	On relay bracket, at center of firewall. See Fig. 4.
3.3L	On relay bracket, at center of firewall. See Fig. 5.
Component View (All Engines)	On relay bracket, at center of firewall. See Fig. 6.
Defogger Timer Relay
Except Calais	Behind left side of dash, near fuse block.
Calais (1989)	Behind right side of dash, above glove box.
Calais (1990)	Behind right side of dash, behind radio.
Fog Light Relay	On left front inner fender panel, in front of shock tower.
Fuel Pump Relay
2.0L (1989)	On relay bracket, at center of firewall. See Fig. 1.
2.3L (1989)	On relay bracket, at center of firewall. See Fig. 2.
2.3L (1990)	On relay bracket, at center of firewall. See Fig. 3.
2.5L	On relay bracket, at center of firewall. See Fig. 4.
3.3L	On relay bracket, at center of firewall. See Fig. 5.
Component View (All Engines)	On relay bracket, at center of firewall. See Fig. 6.
Hazard Flasher Relay
Except Grand Am	In convenience center.
Grand Am	Behind center of dash, in front of console.
Horn Relay
Except Grand Am	In convenience center.
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.
Power Door Lock Relay Assy.	Behind right kick panel.
Radio Amplifier Power Relay	In center console, ahead of gear selector.
Turn Signal Flasher Relay	Under left side of dash, above fuse block.

Buick Skylark Custom 1990 - CIRCUIT PROTECTION DEVICES

Buick Skylark Custom 1990 CIRCUIT PROTECTION DEVICES LOCATION

Component	Location
Convenience Center (Except Grand Am)	Under left side of dash, above fuse block.
Fuse Block
2.0L (1989)	Under left side of dash, to left of steering column. See Fig. 1.
2.3L (1989)	Under left side of dash, to left of steering column. See Fig. 2.
2.3L (1990)	Under left side of dash, to left of steering column. See Fig. 3.
2.5L	Under left side of dash, to left of steering column. See Fig. 4.
3.3L	Under left side of dash, to left of steering column. See Fig. 5.
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.
Exc. 2.3L (Blue & Rust)	At starter solenoid.
ECM (Gray)	At starter solenoid or fusible link junction block.
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 Accy. Circuit Breaker	In fuse block.
Power Window Circuit Breaker	In fuse block.

Buick Skylark Custom 1990 - CONTROL UNITS

Buick Skylark Custom 1990 CONTROL UNITS LOCATION

Component	Location
Anti-Lock Brake Controller (3.3L) (1990)	Under right front seat.
Audio Alarm Module (1989)
Grand Am	Behind right side of dash, above glove box.
Except Grand Am	On convenience center, left of steering column.
Automatic Door Lock Controller	Behind right kick panel, at top.
Cruise Control Module	Under left side of dash, to left of steering column.
C(3)I Module (3.3L) (1989)	At left front of engine. See Fig. 5.
DIC Display Module	In center of dash, below radio.
DIC Lights Monitor Mod.	Below center of dash, in front of console.
Dimmer Module (Calais)	On bracket, under steering column.
Distributorless Ignition System (DIS) Module
Grand Am (2.5L)	At right rear of engine block. See Fig. 4.
Skylark (3.3L)	At right rear of engine block.
Electronic Control Module (ECM)
2.0L (1989)	Behind glove box. See Fig. 1.
2.3L (1989)	Behind glove box. See Fig. 2.
2.3L (1990)	Behind glove box. See Fig. 3.
2.5L	Behind glove box. See Fig. 4.
3.3L	Behind glove box. See Fig. 5.
Integrated Distributorless Ignition (IDI) Module (2.3L)
1989	Under IDI cylinder head cover. See Fig. 2.
1990	Under IDI cylinder head cover. See Fig. 3.
Lights Monitor Module (1990)	Behind center of dash, behind radio.
Multi-Function Alarm Module (1990)
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 center of driver's door.
Remote Dimmer Module	Behind dash, to right of steering column.
Remote Keyless Entry Module (1990)	In luggage compartment, above left wheelwell.
Seat Belt Indicator Driver Module	In harness, behind left kick panel.

Buick Skylark Custom 1990 - SENDING UNITS & SENSORS

Buick Skylark Custom 1990 SENDING UNITS & SENSORS LOCATION

Component	Location
A/C Refrigerant Pressure Sensor (3.3L) (1990)	At right front side of engine compartment, near radiator.
A/C Refrigerant Temp. Sensor	On discharge line, at A/C condenser.
Coolant Temperature Sending Unit/Switch
2.0L (1989)	On rear of cylinder head, under distributor.
2.3L	At right rear of cylinder head, behind CTS.
2.5L	At left rear corner of cylinder head.
3.3L	At right front corner of engine, under alternator and left of CTS.
Coolant Temperature Sensor (CTS)
2.0L (1989)	At left front of engine, in coolant outlet. See Fig. 1.
2.3L (1989)	At right rear of cylinder head. See Fig. 2.
2.3L (1990)	At left rear of engine, behind coolant outlet. See Fig. 3.
2.5L	At right rear of engine, in coolant outlet. See Fig. 4.
3.3L (1989)	At right front corner of engine, under alternator. See Fig. 5.
3.3L (1989)	At left front of engine, below coolant outlet. See Fig. 5.
Crankshaft Position Sensor
2.3L	At lower left front of engine, above oil filter.
2.5L	Inside DIS module. At right rear of engine block. See Fig. 4.
3.3L	At lower left front of engine, behind crankshaft pulley. See Fig. 5.
Dual Crank Sensor (3.3L)	At top right side of engine. See Fig. 5.
Fuel Gauge Sending Unit	In fuel tank.
Knock Sensor
2.0L (1989)	At right side center of engine block. See Fig. 1.
2.3L (1989)	At right rear corner of engine block. See Fig. 2.
2.3L (1990)	At lower left corner of engine block. See Fig. 3.
3.3L (1989)	At right front side of engine block. See Fig. 5.
3.3L (1990)	At lower right rear of engine block, near A/C hose. See Fig. 5.
Manifold Absolute Press. (MAP) Sensor
2.0L (1989)	On intake manifold bracket, in front of EGR valve. See Fig. 1.
2.3L (1989)	On bracket at radiator support, behind hood latch. See Fig. 2.
2.3L (1990)	At center of engine, above intake manifold. See Fig. 3.
2.5L	On air cleaner housing. See Fig. 4.
Manifold Air Temp. (MAT) Sensor
2.0L (1989)	In intake manifold, behind MAP sensor. See Fig. 1.
2.3L (1989)	At left front of engine compartment, in air cleaner housing. See Fig. 2.
2.3L (1990)	At left front of engine compartment, on intake manifold. See Fig. 3.
2.5L	In intake manifold, below throttle body. See Fig. 4.
Mass Airflow (MAF) Sensor (3.3L)	On left side of throttle body. See Fig. 5.
Oxygen (O2) Sensor
2.0L (1989)	In exhaust manifold. See Fig. 1.
2.3L (1989)	In exhaust manifold. See Fig. 2.
2.3L (1990)	In exhaust manifold. See Fig. 3.
2.5L	In exhaust manifold. See Fig. 4.
3.3L	In exhaust manifold. See Fig. 5.
Throttle Position Sensor (TPS)
2.0L (1989)	On throttle body. See Fig. 1.
2.3L (1989)	On throttle body. See Fig. 2.
2.3L (1990)	On throttle body. See Fig. 3.
2.5L	On throttle body. See Fig. 4.
3.3L	On throttle body. See Fig. 5.
Vehicle Speed Sensor (VSS) ATX
2.0L (1989)	At rear of engine, on right end of transaxle. See Fig. 1.
2.3L (1989)	At rear of engine, on right end of transaxle. See Fig. 2.
2.3L (1990)	At rear of engine, on top of transaxle. See Fig. 3.
2.5L	At rear of engine, on right end of transaxle. See Fig. 4.
3.3L	At rear of engine, on right end of transaxle. See Fig. 5.
Vehicle Speed Sensor (VSS) MTX Manual Transaxle (2.3L) (1989)	At rear of engine, on top of transaxle. See Fig. 2.

Buick Skylark Custom 1990 - MOTORS

Buick Skylark Custom 1990 MOTORS LOCATION

Component	Location
A/C-Heater Blower Motor	At right side of firewall, in engine compartment.
Idle Air Control (IAC) Motor
2.0L (1989)	On throttle body. See Fig. 1.
2.3L (1989)	On throttle body. See Fig. 2.
2.3L (1990)	On throttle body. See Fig. 3.
2.5L	On throttle body. See Fig. 4.
3.3L	On throttle body. See Fig. 5.
Power Antenna Motor	At base of antenna.
Power Door Lock Motors	One in each door.
Power Mirror Motors	In each mirror assembly.
Power Seat Motors	Under driver's seat.
Power Window Motors	One in each door.
Windshield Wiper Motor	On left side of firewall, in engine compartment.

Buick Skylark Custom 1990 - SOLENOIDS & SOLENOID VALVES

Buick Skylark Custom 1990 SOLENOIDS & SOLENOID VALVES LOCATION

Component	Location
Auto. Seat Belt Retractor Solenoid	One in bottom rear of each door.
Auto. Seat Belt Retractor Switch	One in rear of each door, on latch assembly.
Auto. Transaxle Solenoids (Exc. 2.5L)	On transaxle valve body.
Brake Cruise Release Sol. Valve	On brake pedal support.
Canister Purge Solenoid
2.3L (1989)	On vapor canister, or in vapor purge hose. See Fig. 2.
2.3L (1990)	On vapor canister, or in vapor purge hose. See Fig. 3.
3.3L (1989)	On vapor canister, or in vapor purge hose. See Fig. 5.
EGR Solenoid Valve (1989)	On intake manifold. See Fig. 1.
Luggage Compartment Release Solenoid	In center of luggage compartment, on latch assembly.
Safety Belt Lap Retractor Solenoid (1990)	In lower rear of each front door.
Safety Belt Shoulder Retractor Solenoid (1990)	In upper rear of each front door.
Torque Converter Clutch (TCC) Solenoid
2.0L (1989)	On transaxle valve body. See Fig. 1.
2.3L (1989)	On transaxle valve body. See Fig. 2.
2.3L (1990)	On transaxle valve body. See Fig. 3.
2.5L	On transaxle valve body. See Fig. 4.
3.3L	On transaxle valve body. See Fig. 5.
Wastegate Solenoid (2.0L)	On valve cover bracket, next to EGR valve. See Fig. 1.

Buick Skylark Custom 1990 - SWITCHES

Buick Skylark Custom 1990 SWITCHES LOCATION

Component	Location
A/C High Press. Cut-Out Switch	On back of A/C compressor.
A/C Low Press. Cut-Out Switch	On back of A/C compressor.
A/C Press. Cycling Switch (Except Skylark)	On A/C accumulator.
Back-Up Light Switch	On transaxle.
Brake Fluid Level Switch	In master cylinder reservoir. See Fig. 6.
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 (1990)	In coolant reservoir.
Door Ajar Switch	One in each door jamb.
Fuel Pump/Oil Pressure Switch
2.0L (1989)	In right front of engine block.
2.3L (1989)	At right rear of cylinder head, above coolant outlet.
2.3L (1990)	On top left side of engine. See Fig. 3.
2.5L (1989)	At right rear of engine block, in front of DIS module.
2.5L (1990)	On left rear of engine compartment, near DIS. See Fig. 4.
3.3L (1989)	At right front corner of engine block, in front of knock sensor.
3.3L (1990)	On lower right rear of engine. See Fig. 5.
Gear Selector Switch (Auto.)	In console, at base of shifter lever.
Hood Ajar Switch	On top left side of radiator bracket.
Parking Brake Switch	In console, at base of parking brake lever.
Park/Neutral (P/N) Switch
2.0L (1989)	On transaxle. See Fig. 1.
2.3L (1989)	On transaxle. See Fig. 2.
2.5L (1989)	On transaxle. See Fig. 4.
3.3L	On transaxle. See Fig. 5.
Power Steering Press. Switch (PSPS)
2.0L (1989)	In power steering pressure line, near left shock tower. See Fig. 1.
2.5L	In power steering pressure line, near left shock tower. See Fig. 4.
2.3L	In power steering pressure line, near engine coolant outlet.
3.3L	In power steering pressure line, near left shock tower. See Fig. 5.
Seat Belt Switch	In driver's seat belt assembly.
Windshield Washer Fluid Level Switch	In fluid reservoir.
3rd Gear Switch (2.5L Auto.)	In automatic transaxle valve body.

Buick Skylark Custom 1990 - MISCELLANEOUS

Buick Skylark Custom 1990 MISCELLANEOUS LOCATION

Component	Location
A/C Compressor Clutch Diode	In connector at compressor clutch.
A/C-Heater Blower Resistors	On right side of firewall, on blower assembly.
ALDL Diagnostic Connector
2.0L (1989)	At bottom of dash, to right of steering column. See Fig. 1.
2.3L (1989)	At bottom of dash, to right of steering column. See Fig. 2.
2.3L (1990)	At bottom of dash, to right of steering column. See Fig. 3.
2.5L	At bottom of dash, to right of steering column. See Fig. 4.
3.3L	At bottom of dash, to right of steering column. See Fig. 5.
Fuel Pump Prime/Test Connector
2.0L (1989)	In harness, behind left shock tower. See Fig. 1.
2.3L (1989)	In harness, behind left shock tower. See Fig. 2.
2.3L (1990)	In harness, behind left shock tower. See Fig. 3.
2.5L	In harness, behind left shock tower. See Fig. 4.
3.3L	In harness, behind left shock tower. See Fig. 5.
Vehicle Speed Sensor (VSS) Buffer	Behind right side of dash, in ECM. See Fig. 5.