ELECTRICAL COMPONENT LOCATOR 1990 HONDA ELECTRICAL COMPONENTS

Honda Prelude 2.0 S 1990 - BUZZERS, RELAYS & TIMERS

Honda Prelude 2.0 S 1990 BUZZERS, RELAYS & TIMERS LOCATION

Component	Location
A/C Comp. Clutch Relays "A" & "B"	In right front corner of engine compartment, on battery tray. See Fig. 1 .
Antenna Retractor Relay	In right side of trunk, near antenna.
Condenser Fan Relay	In engine compartment fuse/relay block. See Fig. 2 .
Cooling Fan Timer Unit	Below right side of dash, below kick panel. See Fig. 3 .
Dimmer Relay	In engine compartment fuse/relay block. See Fig. 2 .
Foglight Relay	Behind left kick panel, on relay holder. See Fig. 4 .
Fuel Cut-Off Relay (Carb.)	Behind left side of dash, next to fuse block. See Fig. 5 .
Headlight Retractor Relays
Left	In left front corner of engine compartment. See Fig. 6 .
Right	In right front corner of engine compartment. See Fig. 7 .
Lighting Relay	In engine compartment fuse/relay block. See Fig. 2 .
PGM-FI Main Relay	Behind left side of dash, next to fuse block. See Fig. 5 .
Power Window Relay	Behind left kick panel, on relay holder. See Fig. 4 .
Radiator Fan Relay	In engine compartment fuse/relay block. See Fig. 2 .
Rear Window Defogger Relay	Behind left kick panel, on relay holder. See Fig. 4 .
Seat Belt Warning Chime	Below left side of dash.
Starter Relay	Behind left side of dash, above cruise control unit. See Fig. 4 .
Sun Roof Relays (Open & Close)	Behind left kick panel, on relay holder. See Fig. 4 .
Turn Signal/Hazard Relay	Behind left kick panel, on relay holder. See Fig. 4 .

Honda Prelude 2.0 S 1990 - CIRCUIT PROTECTION DEVICES

Honda Prelude 2.0 S 1990 CIRCUIT PROTECTION DEVICES LOCATION

Component	Location
Passenger Compartment Fuse Block	Under left side of dash. See Fig. 8 .
Engine Compartment Fuse/Relay Block	In front of right wheelwell. See Fig. 2 .

Honda Prelude 2.0 S 1990 - CONTROL UNITS

Honda Prelude 2.0 S 1990 CONTROL UNITS LOCATION

Component	Location
A/C Compressor Control Unit	Behind right side of dash, right of glove box.
Automatic Transmission Control Unit
2.0L	Behind center of dash.
2.1L	Under passenger side footwell, by ECU control unit.
Cruise Control Unit	Behind left side of dash. See Fig. 4 .
Dash Light Brightness Control Unit	Behind dash lower left panel. See Fig. 9 .
Electronic Control Unit (ECU)	On passenger side footwell, under carpet.
Ignitor Unit (Carb)	On underside of distributor cover.
Ignitor Unit (EFI)
View of Ignitor Unit	Near under-hood relay block. See Fig. 10 .
View of Ignitor Unit (2.0L EFI)	Near under-hood relay block. See Fig. 11 .
View of Ignitor Unit (2.1L EFI)	Near under-hood relay block. See Fig. 12 .
Integrated Control Unit	Behind center of dash, near heater unit. See Fig. 13 .
Retractable Headlight Control Unit	Behind right side of dash, right of glove box.
Power Door Lock Control Unit	In passenger door, above speaker.

Honda Prelude 2.0 S 1990 - SENDING UNITS & SENSORS

Honda Prelude 2.0 S 1990 SENDING UNITS & SENSORS LOCATION

Component	Location
Atmospheric Pressure Sensor	On passenger side floorboard, by ECU.
Auto. Trans. Speed Pulser	On right side of transmission.
Brakelight Failure Sensors	In each taillight.
Coolant Temperature Gauge Sender	On top right front of engine.
Coolant Temperature Sensor (Carb.)	At right front of engine, near thermostat housing. See Fig. 14 .
Coolant Temperature Sensor (2.0L EFI)	At right front of engine, near thermostat housing. See Fig. 11 .
Coolant Temperature Sensor (2.1L EFI)	At right front of engine, near thermostat housing. See Fig. 12 .
Cooling Fan Temperature Sensor	On bottom right corner of radiator.
Cylinder Sensor (2.0L EFI)	In distributor. See Fig. 11 .
Cylinder Sensor (2.1L EFI)	In distributor. See Fig. 12 .
EGR Valve Lift Sensor	On top of EGR valve. See Fig. 11 .
Evaporator Sensor	Behind dash, on evaporator.
Intake Air Temperature Sensor (Carb.)	Near air filter. See Fig. 14 .
Intake Air Temperature Sensor (2.0L EFI)	On intake manifold chamber. See Fig. 11 .
Intake Air Temperature Sensor (2.1L EFI)	On intake manifold chamber. See Fig. 12 .
Oxygen sensor (Carb.)	On exhaust manifold. See Fig. 14 .
Oxygen sensor (2.0L EFI)	On exhaust manifold. See Fig. 11 .
Oxygen sensor (2.1L EFI)	On exhaust manifold. See Fig. 12 .
TDC/Crank Sensor (2.0L EFI)	In distributor. See Fig. 11 .
TDC/Crank Sensor (2.1L EFI)	In distributor. See Fig. 12 .
Throttle Angle Sensor (Carb.)	On right side of carburetor.
Throttle Angle Sensor (2.0L EFI)	On top of throttle body. See Fig. 11 .
Throttle Angle Sensor (2.1L EFI)	On top of throttle body. See Fig. 12 .
Vehicle Speed Sensor	On top of power steering speed sensor on transaxle.

Honda Prelude 2.0 S 1990 - MOTORS

Honda Prelude 2.0 S 1990 MOTORS LOCATION

Component	Location
A/C-Heater Blower Motor	Under right side of dash.
A/C Condenser Fan Motor	Behind left side of radiator.
Headlight Retractor Motors	Behind each headlight assembly.
Heater Function Control Motor	Behind center of dash, to left of heater case.
Heater Recirculation Control Motor	On blower heater case.
Radiator Cooling Fan Motor	Behind radiator.
Sun Roof Motor	Center rear of roof.
Power Antenna Motor	In right side of trunk.
Washer Motor	Behind left front bumper, below washer fluid reservoir.
Wiper Motor	In left rear corner of engine compartment.

Honda Prelude 2.0 S 1990 - SOLENOIDS & SOLENOID VALVES

Honda Prelude 2.0 S 1990 SOLENOIDS & SOLENOID VALVES LOCATION

Component	Location
Air Leak Solenoid Valve (Carb.)	On air cleaner housing. See Fig. 14 .
Air Suction Control Solenoid Valve (Carb.)	In control box.
Air Vent Cut-Off Solenoid Valve (Carb)	On top rear of engine, near carburetor.
By-Pass Control Solenoid Valve (2.0L EFI)	In control box.
Cranking Leak Solenoid Valve (Carb.)	In control box.
EGR Valve Control Solenoid	In control box.
Electronic Air Control Valve (Carb.)	On top right of engine, on intake manifold.
Electronic Air Control Valve (2.0L EFI)	On top of engine. See Fig. 11 .
Electronic Air Control Valve (2.1L EFI)	On top of engine. See Fig. 12 .
Idle Boost Solenoid Valve (Carb.)	At center of firewall. See Fig. 14 .
Inner Vent Solenoid Valve (Carb.)	On air cleaner assembly. See Fig. 14 .
Lock-Up Control Solenoid Valve (A & B)	On right front of transaxle.
Primary Slow Mixture Cut-Off Solenoid
Left	On left carburator. See Fig. 15 .
Right	On right carburator. See Fig. 15 .
Purge Cut-Off Solenoid Valve
2.0L EFI	Below control box. See Fig. 11 .
Carb. & 2.1L EFI	In control box.
Seat Belt Retractor Solenoids	In each seat belt retractor.
Shift Control Solenoid Valve (A/T)	On right front side of transmission.

Honda Prelude 2.0 S 1990 - SWITCHES

Honda Prelude 2.0 S 1990 SWITCHES LOCATION

Component	Location
A/C Pressure Switch	On receiver-drier.
Back-Up Light Switch (M/T)	On top right side of transmission.
Brake Fluid Level Switch	On brake fluid reservoir cap.
Brakelight Switch	On top of brake pedal support.
Clutch Switch	On top of clutch pedal support.
Coolant Temperature Switch "A" (EFI)	In radiator, near cooling fan.
Coolant Temperature Switch "B" (EFI)	On thermostat housing.
Neutral Safety Switch (A/T)	Under center console, near gear selector lever.
Oil Pressure Switch	Rear of engine, above oil filter.
Power Steering Oil Pressure Switch (2.0L EFI)	On left rear of engine compartment. See Fig. 11 .
Power Steering Oil Pressure Switch (2.1L EFI)	On left rear of engine compartment. See Fig. 12 .
Seat Belt Switches	In each seat belt buckle assembly.
Shift Position Switch	Under center console, near gear selector lever.

Honda Prelude 2.0 S 1990 - MISCELLANEOUS

Honda Prelude 2.0 S 1990 MISCELLANEOUS LOCATION

Component	Location
A/C Diodes	At right front of vehicle, behind bumper.
Blower Resistor	On blower housing.
Control Box (Carb.)	In right rear of engine compartment. See Fig. 14 .
Control Box (2.0L EFI)	In right rear of engine compartment. See Fig. 11 .
Control Box (2.1L EFI)	In right rear of engine compartment. See Fig. 12 .
Fuel Injector Resistor
View of Fuel Injector Resistor	At center of firewall. See Fig. 16 .
2.0L EFI	At center of firewall. See Fig. 11 .
2.1L EFI	At center of firewall. See Fig. 12 .
Ignition Timing Check Connector	Behind ignition coil.
Radio Noise Condenser	In right rear of engine compartment, on ignition coil.
Speed Pulser (A/T)	On right side of transmission, near starter.