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

Chevrolet Caprice Classic 1990 - BUZZERS, RELAYS & TIMERS

Chevrolet Caprice Classic 1990 BUZZERS, RELAYS & TIMERS LOCATION

Component	Location
A/C Blower Relay	On right side of firewall, near blower motor.
A/C Cut-Out Relay	On right side of firewall, near blower motor. See Fig. 1 .
Defogger Timer Relay	On top of fuse block.
Elect. Level Control Relay	On left front fender panel.
Fuel Pump Relay (TBI)	On bracket, in front of ESC module. See Fig. 2 .
Hazard Flasher Relay	At upper left corner of fuse block.
Horn Relay	On convenience center.
Illuminated Entry Timer	Behind upper portion of left kick panel, near junction block.
Power Antenna Relay	On bracket, under right side of dash and to left of glove box.
Power Door Lock Relay Assembly	Behind bottom of right kick panel.
Power Seat Relay	Under front seats.
Turn Signal Flasher Relay (Exc. Olds.)	On lower right corner of fuse block.
Turn Signal Flasher Relay (Olds.)	On bracket, below left side of steering column.

Chevrolet Caprice Classic 1990 - CIRCUIT PROTECTION DEVICES

Chevrolet Caprice Classic 1990 CIRCUIT PROTECTION DEVICES LOCATION

Component	Location
Convenience Center	On bracket, to left of fuse block.
Fuse Block
5.0L (VIN Y)	Under left side of dash. See Fig. 1 .
5.0L (VIN E)	Under left side of dash. See Fig. 2 .
Fuel Pump Relay In-Line Fuse	In harness, to left of fuel pump relay. See Fig. 2 .
Fusible Links
A/C Blower Relay (Black)	At starter solenoid.
Alternator (Black & Rust)	At starter solenoid.
Fuse Block & Headlight Switch (Black or Rust)	At starter solenoid.
Ignition (Black or Rust)	At starter solenoid.
Power Accessory Circuit Breaker (Defogger, Door Locks, Seats)	In fuse block.
Power Window Circuit Breaker	In fuse block.

Chevrolet Caprice Classic 1990 - CONTROL UNITS

Chevrolet Caprice Classic 1990 CONTROL UNITS LOCATION

Component	Location
A/C Programmer (Auto. A/C)	Behind right side of dash, on A/C-heater plenum.
A/C Blower/Clutch Control Module	On top of blower plenum.
Audio Alarm Module	On convenience center.
Electronic Control Module (ECM)
Carbureted Equipped Models	Behind right kick panel. See Fig. 1 .
TBI Equipped Models	Behind right kick panel. See Fig. 2 .
Elect. Spark Control (ESC) Module
Carbureted Equipped Models	At center of firewall. See Fig. 1 .
TBI Equipped Models	At center of firewall. See Fig. 2 .
Illuminated Entry Timer	Behind dash, left of steering column.
Light Driver Module (Carb.)	Behind right side of dash, above ECM. See Fig. 1 .
Multi-Function Chime Module	On convenience center.
Twilight Sentinel Control	Under left side of dash, at rear of headlight switch.

Chevrolet Caprice Classic 1990 - SENDING UNITS & SENSORS

Chevrolet Caprice Classic 1990 SENDING UNITS & SENSORS LOCATION

Component	Location
Ambient Temp. Sensor (Auto. A/C)	In right A/C-heater air inlet, below screen.
Coolant Temp. Sending Unit/Switch	At front of engine, near left valve cover. See Fig. 3 .
Coolant Temperature Sensor
Carburetor Equipped Models	On front of engine, near coolant outlet. See Fig. 1 .
TBI Equipped Models	On front of engine, near coolant outlet. See Fig. 2 .
Carbureted Engine	On front of engine, near coolant outlet. See Fig. 4 .
Elect. Level Control Height Sensor	On center of rear crossmember.
Fuel Gauge Sending Unit	In fuel tank.
In-Car Temp. Sensor (Auto. A/C)	In right upper part of dash, to left of right speaker.
Knock Sensor
Carbureted	At front of left cylinder head. See Fig. 1 .
TBI
TBI Engine	At front of right cylinder head. See Fig. 2 .
TBI Component Location	At front of right cylinder head. See Fig. 3 .
Low Coolant Level Sensor	In radiator coolant tank.
Manifold Absolute Press. (MAP) Sensor
Carbureted	In engine compartment, at center of firewall. See Fig. 1 .
TBI Engine	In engine compartment, at center of firewall. See Fig. 2 .
TBI Component Location	In engine compartment, at center of firewall. See Fig. 3 .
Manifold Air Temperature (MAT) Sensor (TBI)	In base of air cleaner housing. See Fig. 2 .
Oil Press. Sending Unit/Switch
Carbureted	At front of intake manifold. See Fig. 4 .
TBI	At rear of engine, behind distributor. See Fig. 3 .
Oxygen (O2) Sensor
Carbureted Engine	On exhaust manifold. See Fig. 1 .
TBI Engine	On exhaust manifold. See Fig. 2 .
Throttle Position Sensor (TPS)
Carbureted Engine	On carburetor (inside throttle body). See Fig. 1 .
TBI Engine	On carburetor (inside throttle body). See Fig. 2 .
Carbureted System	On carburetor (inside throttle body). See Fig. 4 .
Vehicle Speed Sensor (VSS)
Carbureted Engine	Behind instrument cluster, at speedometer cable connection. See Fig. 1 .
TBI Engine	Behind instrument cluster, at speedometer cable connection. See Fig. 2 .

Chevrolet Caprice Classic 1990 - MOTORS

Chevrolet Caprice Classic 1990 MOTORS LOCATION

Component	Location
A/C-Heater Blower Motor	In engine compartment, at right side of firewall.
Elect. Level Control Compressor	At front of left fender panel.
Electric Fuel Pump (TBI)	In fuel tank, on fuel tank sending unit.
Idle Air Control (IAC) Motor	On right rear of throttle body. See Fig. 2 .
Idle Load Compensator (ILC)	On left side of carburetor. See Fig. 1 .
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/Washer Motor	In engine compartment, on center of fire wall.

Chevrolet Caprice Classic 1990 - SOLENOIDS & SOLENOID VALVES

Chevrolet Caprice Classic 1990 SOLENOIDS & SOLENOID VALVES LOCATION

Component	Location
Anti-Dieseling Solenoid (Carbureted)	At left front of carburetor. See Fig. 1 .
Canister Purge Solenoid Valve
Carbureted Engine	On bracket, at right front of intake manifold. See Fig. 1 .
Carbureted Component View	On bracket, at right front of intake manifold. See Fig. 4 .
TBI Engine	At left front corner of engine compartment, on vapor canister. See Fig. 2 .
TBI Component View	At left front corner of engine compartment, on vapor canister. See Fig. 3 .
EGR Solenoid Valve
Carbureted Engine	On bracket, at right rear corner of engine. See Fig. 1 .
TBI Engine	On bracket, at right rear corner of engine. See Fig. 2 .
Elect. Vacuum Reg. Valve (EVRV) (Carbureted)	On top of engine, at rear of left valve cover.
Idle Load Compensator Solenoid	On right inner fenderwell.
Lugg. Comp. Release Solenoid	At rear center of luggage compartment.
Mixture Control (M/C) Solenoid
Carbureted Engine	In carburetor. See Fig. 1 .
Carbureted Engine Comp. View	In carburetor. See Fig. 4 .
Torque Conv. Clutch (TCC) Solenoid
Carbureted Engine	In transmission case. See Fig. 1 .
TBI Engine	In transmission case. See Fig. 2 .
Triple Solenoid Assembly (ILC/EGR/RVB Solenoid - Carbureted)
Carbureted Engine	On rear of left valve cover. See Fig. 1 .
Carbureted Engine Comp. View	On rear of left valve cover. See Fig. 4 .

Chevrolet Caprice Classic 1990 - SWITCHES

Chevrolet Caprice Classic 1990 SWITCHES LOCATION

Component	Location
A/C Compressor Cut-Out Switch	On accelerator pedal bracket.
A/C Pressure Cycling Switch	On right side of firewall, on accumulator.
Brake/Cruise/Stoplight/Torque Converter Switch	On brake pedal support.
Brake Pressure Switch	Under left side of firewall, below master cylinder.
Fuel Pump/Oil Pressure Sw. (TBI)	On lower left rear of engine block.
Gear Selector Switch	On lower portion of steering column.
Park/Neutral Start Switch (A/T)	On transmission housing.
Parking Brake Switch	Attached to top of parking brake assembly.
Power Steering Press. Switch (PSPS)
TBI Engine	On power steering pump. See Fig. 2 .
TBI Engine Comp. View	On power steering pump. See Fig. 3 .
Seat Belt Switch	Part of driver's seat belt assembly.
Tailgate Ajar Switch	Inside lower right corner of tailgate assembly.
Tailgate Block-Out Switch	At upper right corner of tailgate assembly.
Washer Fluid Level Switch	In windshield washer reservoir.
3rd & 4th Gear Switches	In automatic transmission.

Chevrolet Caprice Classic 1990 - MISCELLANEOUS

Chevrolet Caprice Classic 1990 MISCELLANEOUS LOCATION

Component	Location
A/C Compressor Clutch Diode	Taped inside compressor clutch connector.
A/C-Heater Blower Resistors	At right side of firewall, near blower motor.
ALDL Diagnostic Connector
5.0L (VIN Y)	Under left side of dash, to right of steering column. See Fig. 1 .
5.0L (VIN E)	Under left side of dash, to right of steering column. See Fig. 2 .
Alternator Diode	In dash wiring harness, near fuse block.
Automatic Door Lock Diode	Behind left kick panel, near lower access hole.
Diag. Dwell Meter Connector (Carb)
Carbureted Engine	Taped to wiring harness, in front of carb. (Green connector). See Fig. 1 .
Carbureted Engine Comp. View	Taped to wiring harness, in front of carb. (Green connector). See Fig. 4 .
Fuel Pump Prime/Test Connector (TBI)	Taped to wiring harness, by fuel pump relay. See Fig. 2 .
Set Timing Connector	On right fender panel. See Fig. 2 .
Twilight Sentinel Amplifier	On bracket, behind right side of dash.
Twilight Sentinel Photocell	On top left side of dash.
Vehicle Speed Sensor Buffer	Taped to dash wiring harness, near fuse block.
Washer Pump Motor Diode	In washer motor connector.
Wiper Motor Relay Diode	In wiper motor connector.