Contents Wiring diagrams Section: Electrical Component Locations All sections

Electrical Component Locator: Other Lexus SC I

BUZZERS, RELAYS & TIMERS

ComponentComponent Location
Actuator Relay (ABS System) (1995)In engine compartment relay block No. 6, on left firewall.
Auto. Antenna Motor RelayOn antenna motor, on left side of luggage compartment.
Blower Motor Control RelayUnder right side of dash, beside blower motor. (Схема №5)
Brake Main Relay (Traction Control System) (1995)In engine compartment relay block No. 6, on left firewall.
Defogger RelayIn engine compartment relay block No. 2.
Dimmer RelayIn engine compartment relay block No. 2.
EFI Main Relay (SC300)In engine compartment relay block No. 2. (Схема №3)
EFI Main Relay (SC400)In engine compartment relay block No. 2. (Схема №4)
Fog Lamp RelayIn passenger compartment relay block No. 5.
Headlamp RelayIn engine compartment relay block No. 2.
Heater RelayIn engine compartment relay block No. 2.
Horn RelayIn passenger compartment relay block No. 4.
Ignition Main RelayIn passenger compartment relay block No. 4.
Integration RelayIn passenger compartment junction block No. 1. (Схема №1)
Magnetic Clutch Relay (A/C System)In engine compartment relay block No. 2.
Moon Roof Control RelayOn left of moon roof control switch.
Motor Relay (ABS System)In engine compartment relay block No. 6, on left firewall.
Motor Relay (Traction Control System)In engine compartment relay block No. 6, on left firewall.
Power Main RelayIn passenger compartment junction block No. 1.
Solenoid Relay (ABS System) (1996)In engine compartment relay block No. 6, on left firewall.
Solenoid Relay (Traction Control System)In engine compartment relay block No. 6, on left firewall.
Starter RelayIn engine compartment relay block No. 2.
Taillamp RelayIn passenger compartment junction block No. 1.
Telephone Transceiver & Speaker RelayIn left side of luggage compartment.
Turn Signal FlasherIn passenger compartment relay block No. 4.

BUZZERS, RELAYS & TIMERS

CIRCUIT PROTECTION DEVICES

ComponentComponent Location
Junction Block No. 1Behind left kick panel. (Схема №1)
Junction Block No. 3Behind center of dash. (Схема №1)
Relay Block No. 2In left front of engine compartment, behind battery.
Relay Block No. 4Behind left kick panel. (Схема №1)
Relay Block No. 5Behind left kick panel. (Схема №1)

CIRCUIT PROTECTION DEVICES

CONTROL UNITS

ComponentComponent Location
ABS ECU (W/O Traction Control)Under right front floorboard. (Схема №1)
ABS & Traction ECU (W/ Traction Control)Under right front floorboard. (Схема №1)
Cooling Fan ECUUnder right side of dash, behind glove compartment. (Схема №1)
Cruise Control ECUBehind left side of dash. (Схема №1)
Driver's Power Seat ECUUnder driver's seat.
Engine Control Module (View 1)Under right front floorboard. (Схема №1)
Engine Control Module (SC300) (View 2)Under right front floorboard. (Схема №3)
Engine Control Module (SC400) (View 2)Under right front floorboard. (Схема №4)
Fuel Pump ECU (SC300)Behind left rear quarterpanel. (Схема №3)
Fuel Pump ECU (SC400)Behind left rear quarterpanel. (Схема №4)
Passenger's Power Seat ECUUnder front passenger's seat.
Progressive Power Steering (PPS) ECUUnder right side of dash. (Схема №1)
Remote Control Mirror ECUBehind left center of dash. (Схема №1)
Shift Lock ECU (View 1)Under center console, front of shifter. (Схема №1)
Shift Lock ECU (View 2)Under center console, left of shifter. (Схема №2)
Theft Deterrent & Door Lock Control ECUBehind left side of dash. (Схема №1)
Tilt & Power Telescopic ECU (A/T)Behind left side of dash. (Схема №1)
Tilt & Power Telescopic ECU (M/T)Behind right side of dash. (Схема №1)
Traction ECUBehind right side of dash. (Схема №1)
Wireless Door Lock Control ECUBehind right rear quarterpanel, below window.

CONTROL UNITS

MOTORS

ComponentComponent Location
Air Inlet ServomotorUnder right side of dash, on blower motor housing. (Схема №5)
Air Mix ServomotorBehind right side of center console, behind heater case. (Схема №5)
Air Outlet ServomotorBehind right side of center console, near aspirator. (Схема №5)
Blower MotorBehind right side of dash. (Схема №5)
Fuel Pump (SC300)In fuel tank. (Схема №3)
Fuel Pump (SC400)In fuel tank. (Схема №4)
Washer MotorBottom of windshield washer reservoir.
Wiper MotorIn left side of firewall.

MOTORS

SENDING UNITS & SENSORS

ComponentComponent Location
ABS SensorsOn bracket, on all 4 wheel hubs.
Air Bag Sensor AssemblyUnder front of center console. (Схема №1)
Air Bag Sensor (Front) (2)On left and right front of inner fender, above wheelwell.
Ambient Temperature SensorBehind right front grille.
Camshaft Position Sensor No. 1 (SC400)On left front of engine. (Схема №4)
Camshaft Position Sensor No. 2 (SC400)On right front of engine. (Схема №4)
Crankshaft Position Sensor (SC300) (1996)On front of engine.
Crankshaft Position Sensor (SC400)On front of crankshaft, next to oil pump. (Схема №4)
Engine Coolant Temperature Sensor (A/C)Mounted on heater core. (Схема №5)
Engine Coolant Temperature Sensor (SC300)On top of engine, near data link connector No. 1. (Схема №3)
Engine Coolant Temperature Sensor (SC400)On top right of cylinder head, near ignition coil. (Схема №4)
EGR Gas Temperature Sensor (SC300)On EGR valve base. (Схема №3)
EGR Gas Temperature Sensor (SC400)On EGR valve base. (Схема №4)
Evaporator Temperature SensorIn evaporator case. (Схема №5)
Knock Sensors No. 1 (SC300)On left side of engine. (Схема №3)
Knock Sensors No. 1 (SC400)On top center of engine. (Схема №4)
Knock Sensors No. 2 (SC300)On left side of engine. (Схема №3)
Knock Sensors No. 2 (SC400)On top center of engine. (Схема №4)
Light Failure SensorOn left side of luggage compartment.
Main Heated Oxygen Sensor (2) (SC300) (Calif.)In right & left exhaust manifold. (Схема №3)
Main Heated Oxygen Sensor (2) (SC400)In right & left exhaust manifold. (Схема №4)
Mass Airflow Meter (1996)On air cleaner housing.
Oxygen Sensor (2) (SC300) (Except Calif.)In right & left exhaust manifold. (Схема №3)
Progressive Power Steering SensorIn power steering pump assembly.
Room Temperature SensorOn lower dash panel, right of steering column. (Схема №5)
Solar SensorOn top right of dash. (Схема №5)
Steering Column Telescopic Position SensorBehind left side of dash, near telescopic motor.
Steering Column Tilt Position SensorOn steering column, under cover behind steering wheel.
Sub Heated Oxygen Sensor (SC300) (Calif.)In exhaust after TWC. (Схема №3)
Sub Heated Oxygen Sensor (2) (SC400)In right & left exhaust after TWC. (Схема №4)
Sub Throttle Position Sensor (W/ Traction Control) (SC300)On throttle body. (Схема №3)
Sub Throttle Position Sensor (W/ Traction Control) (SC400)On throttle body. (Схема №4)
Throttle Position (TP) Sensor (SC300)On throttle body. (Схема №3)
Throttle Position (TP) Sensor (SC400)On throttle body. (Схема №4)
Vehicle Speed Sensor (VSS) No. 1 (SC300)On transmission output shaft. (Схема №3)
Vehicle Speed Sensor (VSS) No. 1 (SC400)On transmission output shaft. (Схема №4)
Vehicle Speed Sensor (VSS) No. 2In speedometer assembly.
Volume Air Flow Meter (SC300)On air cleaner housing. (Схема №3)
Volume Air Flow Meter (SC400)On air cleaner housing. (Схема №4)

SENDING UNITS & SENSORS

SOLENOIDS & SOLENOID VALVES

ComponentComponent Location
EGR Vacuum Switching Valve (VSV) (SC300)On top left of intake manifold.
EGR Valve (SC400)In center rear of engine compartment. (Схема №4)
EVAP Vacuum Switching Valve (VSV) (SC300)On left rear side of engine, below intake runner.
EVAP Vacuum Switching Valve (VSV) (SC400)On top front of intake manifold.
Fuel Lid Opener SolenoidOn right side of luggage compartment.
Fuel Pressure Up Vacuum Switching Valve (VSV)On top front of engine.
Key Interlock SolenoidIn ignition switch assembly. (Схема №2)
Idle Air Control (IAC) Valve (SC300)On throttle body. (Схема №3)
Idle Air Control (IAC) Valve (SC400)On throttle body. (Схема №4)
Intake Control Vacuum Switching Valve (VSV) (SC300)Beside oil dipstick.
Progressive Power Steering SolenoidIn steering gear assembly.
Seat Belt Electric Tension Reducer SolenoidOn each front seat belt retractor assembly.
Shift Lock SolenoidUnder center console, near shift lever. (Схема №2)
Sub-Throttle Actuator (W/ Traction Control)On throttle body.
Water Vacuum Switching Valve (VSV)On right firewall.

SOLENOIDS & SOLENOID VALVES

SWITCHES

ComponentComponent Location
A/C Pressure SwitchOn refrigerant line, on firewall.
Brake Fluid Level SwitchIn brake fluid reservoir.
Buckle SwitchOn driver's seat belt buckle.
Park/Neutral Position Switch (SC300)On top left of transmission. (Схема №3)
Park/Neutral Position Switch (SC400)On top left of transmission. (Схема №4)
Oil Level Warning SwitchOn left side of engine block.
Oil Pressure SwitchOn left side of engine block.
Parking Brake SwitchBottom of parking brake lever.
Power Steering Pressure Switch (SC300)In power steering pump. (Схема №3)
Shift Lock Control SwitchOn bottom of shift lever. (Схема №2)
Stoplight SwitchOn bracket, above brake pedal. (Схема №2)
Windshield Washer Level SwitchIn windshield washer fluid reservoir.

SWITCHES

MISCELLANEOUS

ComponentComponent Location
Data Link Connector (DLC) 1 (SC300)On bracket, behind left strut tower.
Data Link Connector (DLC) 1 (SC400)On top left of engine. (Схема №4)
Data Link Connector (DLC) 2 (SC300)Under left side of dash. (Схема №3)
Data Link Connector (DLC) 2 (SC400)Under left side of dash. (Схема №4)
Distributor (SC300)On top front of engine. (Схема №3)
Distributor No. 1 (SC400)On left front of engine. (Схема №4)
Distributor No. 2 (SC400)On right front of engine. (Схема №4)
Igniter (SC300)In left side of engine compartment. (Схема №3)
Igniter No. 1 (SC400)In left side of engine compartment. (Схема №4)
Igniter No. 2 (SC400)In left side of engine compartment. (Схема №4)
Ignition Coil (SC300)In right side of engine compartment. (Схема №3)
Ignition Coil No. 1 (SC400)In left front side of engine compartment. (Схема №4)
Ignition Coil No. 2 (SC400)In right front side of engine compartment. (Схема №4)
Stereo Power AmplifierOn right side of trunk.

MISCELLANEOUS

CONNECTORS

ComponentComponent Location
Ba1 (14 Pin)Under driver's seat.
Ba2 (6 Pin)Under driver's seat.
Bb1 (6 Pin)Under right front seat.
Bc1 (Orange, 25 Pin)Under left rear seat.
Bc2 (12 Pin)Under left rear seat.
Bd1 (1996) (Black, 2 Pin)At right side of trunk.
BS1 (Green, 8 Pin)At left kick panel.
BT1 (Brown, 20 Pin)At left kick panel.
BU1 (Blue, 10 Pin)At left kick panel.
BV1 (Orange, 19 Pin)Under center of dash.
BV2 (Green, 10 Pin)Under center of dash.
BV3 (Brown, 16 Pin)Under right front seat.
BX1 (Brown, 18 Pin)At right kick panel.
BY1 (Blue, 8 Pin)At right kick panel.
BZ1 (8 Pin)At left front of roof.
EA1 (SC400) (Gray, 3 Pin)At front of right fender apron.
EA2 (SC400) (1 Pin)Under the mass air flow meter.
EB1 (Black, 8 Pin)At front of R/B No. 2.
EB2 (3 Pin)At front of R/B No. 2.
EC1 (SC400) (Dark Gray, 6 Pin)At front of left cylinder head cover.
EC2 (SC400) (Dark Gray, 4 Pin)At front of left cylinder head cover.
ED1 (SC400) (1995) (Black, 11 Pin)At rear of air intake chamber.
ED1 (SC400) (1996) (Black, 8 Pin)At rear of air intake chamber.
ED2 (SC400) (1996) (Black, 1 Pin)At rear of air intake chamber.
IE1 (26 Pin)At R/B No. 4.
Ie1 (1996) (4 Pin)At left kick panel.
IE2 (26 Pin)Behind glove box.
IF1 (Blue, 20 Pin)At left kick panel.
IF2 (Blue, 20 Pin)At left kick panel.
IG1 (Orange, 22 Pin)At R/B No. 5.
IG2 (Orange, 10 Pin)At R/B No. 5.
IG3 (Orange, 10 Pin)At right kick panel.
II1 (7 Pin)Behind glove box.
IJ1 (Dark Gray, 14 Pin)At right kick panel.
IJ2 (Dark Gray, 16 Pin)At right kick panel.
IJ1 (Dark Gray, 14 Pin)At right kick panel.
IK1 (Orange, 23 Pin)At right kick panel.
IK2 (25 Pin)At right kick panel.
IN1 (6 Pin)Behind glove box.
IO1 (11 Pin)At right kick panel.
IP1 (Blue, 20 Pin)At right kick panel.
IP2 (Blue, 9 Pin)At right kick panel.
IQ1 (Gray, 19 Pin)At front of center console.
IQ2 13 Pin)At front of center console.
IR1 (13 Pin)Behind glove box.
IR2 (Blue, 10 Pin)Behind glove box.

CONNECTORS

GROUNDS

ComponentComponent Location
BKAt bottom of left center pillar.
BLAt bottom of right center pillar.
BMAt rear of trunk.
BNAt right rear pillar.
EAAt front of right fender.
EBAt front of left fender.
EC (SC300)At front of intake manifold.
EDAt rear of right cylinder head.
EE (SC400)At rear of left cylinder head.
IFAt left kick panel. (Схема №1)
IGAt left dash brace. (Схема №1)
IHUnder the ashtray, left side. (Схема №1)
IIUnder the ashtray, right side. (Схема №1)
IJAt right kick panel. (Схема №1)

GROUNDS