Chevrolet Corvette 1990 - ELECTRICAL COMPONENT LOCATOR 1990 ELECTRICAL COMPONENT LOCATIONS General Motors Corp. - Electrical Components

Chevrolet Corvette 1990 - BUZZERS, RELAYS & TIMERS

Chevrolet Corvette 1990 BUZZERS, RELAYS & TIMERS LOCATION

Component	Location
ABS Control Module Relay	Under left corner of rear floor, in storage compartment.
ABS Solenoid Relay	On top of modulator assembly.
A/C Clutch Relay	Behind left side of dash, left of steering column. See Fig. 1 & 2.
Air Pump Relay	On top of air pump.
Amplifier Relay	Behind left side of dash. See Fig. 2 .
Antenna Relay	In luggage compartment, above left rear of wheelwell.
Blower Relay (High & Low)	On left side of engine compartment, on wheelwell.
Cooling Fan Relays (2)	On left side of radiator shroud. See Fig. 1 .
Courtesy Light Relay	Behind right side of dash. See Fig. 3 .
Defogger Relay	Behind right side of dash. See Fig. 3 .
Fog Light Relay	Under right side of dash. See Fig. 3 .
Fuel Pump Relay
No. 1	Behind right side of dash, to left of glove compartment. See Fig. 3 .
No. 2	Behind left side of dash. See Fig. 1 & 2.
Hazard Flasher Relay	In convenience center.
Horn Relay	Behind right side of dash. See Fig. 3 .
Rear Hatch Release Relay	In right rear corner of luggage compartment.
Starter Enable Relay	In convenience center, behind left side of dash. See Fig. 2 .
Turn Signal Flasher Relay	Behind right side of dash panel, near fuse block. See Fig. 2 .
1-4 Up-Shift Relay (Man. Trans.)	Left rear of engine compartment, behind battery. See Fig. 1 .

Chevrolet Corvette 1990 - CIRCUIT PROTECTION DEVICES

Chevrolet Corvette 1990 CIRCUIT PROTECTION DEVICES LOCATION

Component	Location
Defogger Circuit Breaker	In fuse block.
Fuse Block
Auxiliary	Behind right side of dash, near radio receiver box. See Fig. 1 .
Main	Under right side of dash. See Fig. 1 .
Power Accessory Circuit Breaker	In fuse block.
Power Window Circuit Breaker	In fuse block.
Rear Hatch Circuit Breaker	In fuse block.

Chevrolet Corvette 1990 - CONTROL UNITS

Chevrolet Corvette 1990 CONTROL UNITS LOCATION

Component	Location
ABS Control Module	Under left corner of rear floor, in storage compartment.
A/C-Heater Programmer	Behind left side of dash, right of steering column.
Blower Control Module (Auto. A/C)	In left side of engine compartment, on firewall.
Central Control Module (CCM)	Behind center of dash. See Fig. 4 .
Cruise Control Module	Behind right side of dash, near radio receiver box.
Daytime Running Light Module	Behind center of dash. See Fig. 4 .
Diode Module	Behind right side of dash.
Electronic Control Module (ECM)	On left side of engine compartment, near battery. See Fig. 1 .
Headlight Door Control Unit	In lower left front of engine compartment.
Inflator Module	Middle of steering wheel.
Low Tire Pressure Warning System Module	Behind left side of dash. See Fig. 4 .
Select Ride Control Module (Opt.)	Under left corner of rear floor, in storage compartment.
Wiper/Washer Motor Module	On left side of firewall.

Chevrolet Corvette 1990 - SENDING UNITS & SENSORS

Chevrolet Corvette 1990 SENDING UNITS & SENSORS LOCATION

Component	Location
ABS Wheel Sensors	On each spindle, at wheel.
A/C Ambient Temperature Sensor	On right top corner of radiator.
A/C In-Car Temperature Sensor
Convertible	In center of luggage compartment lid.
Coupe	On center lock pillar, above left seat.
Coolant Level Sensor	On right side of radiator.
Coolant Temperature Sensor	On front of engine, below throttle body. See Fig. 1 .
Daytime Running Light Sensor	On top of center of dash. See Fig. 4 .
Detonation (Knock) Sensor	On lower right center of engine. See Fig. 1 .
Front Discriminating Sensor
Left Side	Left side of engine compartment, on frame rail under battery. See Fig. 5 .
Right Side	Right side of engine compartment, on frame rail below blower. See Fig. 6 .
Low Tire Pressure Sensors	On each wheel assembly, inside tire.
MAP Sensor	On right rear of intake plenum.
Manifold Air Temp. (MAT) Sensor	On right rear of engine, under plenum.
Oil Pressure/Fuel Pump Sensor	On left rear of engine. See Fig. 1 .
Oil Temperature Sensor	On lower left side of engine, above oil filter.
Oxygen (O2) Sensor	On exhaust pipe. See Fig. 1 .
Sunload Sensor	On top of dash, on center of defroster grille.
Throttle Position Sensor (TPS)	On throttle body. See Fig. 1 .
Vehicle Speed Sensor (VSS)	On left of transmission tailshaft.

Chevrolet Corvette 1990 - MOTORS

Chevrolet Corvette 1990 MOTORS LOCATION

Component	Location
ABS Return Pump	Non-serviceable part of modulator valve assembly.
A/C-Heater Blower Motor	On right side of A/C-heater plenum.
Cooling Fan Motors	In front of engine compartment.
Fuel Pump Motor	In fuel tank.
Headlight Door Motor	Behind headlight assemblies.
Power Antenna Motor	In left rear corner of luggage compartment.
Power Door Lock Motor	One in each door.
Power Seat Motors	Under seat.
Power Window Motors	In lower section of doors.
Windshield Washer Motor	On right side of firewall.
Windshield Wiper Motor	In upper center of firewall.

Chevrolet Corvette 1990 - SOLENOIDS & SOLENOID VALVES

Chevrolet Corvette 1990 SOLENOIDS & SOLENOID VALVES LOCATION

Component	Location
AIR Converter Solenoid	On right front of engine. See Fig. 1 .
AIR Port Solenoid	On right front of engine. See Fig. 1 .
Canister Purge Solenoid	In left front corner of engine compartment, on top of canister. See Fig. 1 .
Deck Lid Release Solenoid
Left Side	On left rear of luggage compartment, above wheelwell.
Right Side	On right side of luggage compartment, near side marker.
EGR Solenoid	On left front of engine, near coolant outlet. See Fig. 1 .
Idle Air Control (IAC) Valve	In throttle body. See Fig. 1 .
TCC Solenoid (Auto. Trans.)	In transmission, on left rear side of transmission.
1-4 Upshift Solenoid (Man. Trans.)	On left side of transmission. See Fig. 1 .

Chevrolet Corvette 1990 - SWITCHES

Chevrolet Corvette 1990 SWITCHES LOCATION

Component	Location
A/C Cooling Fan Switch	In right rear corner of engine compartment, on A/C line. See Fig. 1 .
A/C High Pressure Cut-Out Switch	In right rear corner of engine compartment, on A/C line.
A/C Pressure Cycling Switch	On evaporator housing, on A/C low side line. See Fig. 1 .
Back-Up Light Switch (Man. Trans.)	On lower left side of transmission.
Brake Fluid Level Switch	On master cylinder.
Brake Pressure Switch	On master cylinder.
Brake Stoplight/TCC Switch	On top of brake pedal bracket assembly.
Clutch Start Switch	On top of clutch pedal bracket.
Coolant Level Switch	At bottom of coolant reservoir.
Cooling Fan Temp. Sw. (H.D.)	On left side of engine, behind alternator.
Cruise Control Clutch Switch	On steering column support, behind brake pedal.
Cruise/TCC Brake Switch	On steering column support, behind brake pedal.
Door Ajar Switches	In each door.
Fuel Pump/Oil Pressure Switch	On rear of engine, near distributor.
Hatch Ajar Switch	In luggage compartment, near hatch release.
Headlight Dimmer Switch	On steering column, opposite ignition switch.
Ignition Key Warning Switch	In top of steering column.
Lateral Acceleration Switch	Below center console.
Manual Overdrive Defeat Switch	In front floor console.
Neutral/Start Switch	On shift lever.
Overdrive Select Switch (Auto. Trans.)	In console, near shifter.
Parking Brake Switch	Under parking brake lever.
Seat Belt Switch	In driver's side seat belt buckle assembly.
Transmission Position Switch	On base of shift control lever.
Transmission Switches
1st Gear	On left side of transmission.
4th Gear (Auto. Trans.)	On left side of transmission.

Chevrolet Corvette 1990 - MISCELLANEOUS

Chevrolet Corvette 1990 MISCELLANEOUS LOCATION

Component	Location
ABS Diode	Below left rear floor storage compartment.
ABS Modulator Valve Assembly	Under left corner of rear floor, in storage compartment.
A/C Compressor Clutch Diode	Taped in A/C compressor clutch connector.
A/C-Heater Blower Resistor (Man. A/C)	On A/C-heater plenum, in engine compartment.
ALDL Diagnostic Connector	Under left side of dash, to right of steering column. See Fig. 1 .
ALDL Diagnostic Connector View	Under left side of dash, to right of steering column. See Fig. 4 .
Blower Motor Resistors	In left side of evaporator.
Convenience Center	Under center section of dash panel.
EST Connector	Behind distributor, at firewall.
Fuel Pump "Test" Connector	ALDL terminal "G". See Fig. 1 .
Headlight Actuators	Next to each headlight assembly.
Jump Start Junction Block	In left rear corner of engine compartment, behind battery.
Radio Receiver Box	Under right side of dash, near kick panel.
Set Timing Connector	To right of master cylinder. See Fig. 1 .
Tach Filter	Behind left cylinder head.
Tone Generator	Behind left side of dash, above DIC. See Fig. 4 .
Vehicle Speed Sensor Buffer	In instrument panel.