2003 LEXUS LS430 Head

SENDING UNITS & SENSORS LOCATION
Rear Door W/Motor Lock Assembly LHIn left rear door. See Fig. 29 .
Rear Door W/Motor Lock Assembly RHIn right rear door. See Fig. 29 .
Seat Belt Motor LHBase of left "B" pillar. See Fig. 30 .
Seat Belt Motor RHBase of right "B" pillar. See Fig. 30 .
Seat Climate Fan Motor Rear LH (Seat Back)In left rear seat back. See Fig. 32 .
Seat Climate Fan Motor Rear LH (Seat Cushion)In left rear seat cushion. See Fig. 32 .
Seat Climate Fan Motor Rear RH (Seat Back)In right rear seat back. See Fig. 32 .
Seat Climate Fan Motor Rear RH (Seat Cushion)In right rear seat cushion. See Fig. 32 .
Shoulder Belt Anchor Motor & Position Sensor
(Left)Near center of left "B" pillar. See Fig. 30 .
Shoulder Belt Anchor Motor (Right)Near center of right "B" pillar. See Fig. 30 .
StarterCenter rear of engine. See Fig. 15 .
Suspension Control Actuator Front LHOn left side of engine compartment. See Fig. 15 .
Suspension Control Actuator Front RHOn right side of engine compartment. See Fig. 15 .
Suspension Control Actuator Rear LHNear base of left "C" pillar. See Fig. 30 .
Suspension Control Actuator Rear RHNear base of right "C" pillar. See Fig. 30 .
Telescopic Motor & Position SensorInside base of steering column. See Fig. 18 .
Tilt Motor & Position SensorInside base of steering column. See Fig. 18 .
Washer MotorOn washer fluid reservoir, below left headlight. See
Fig. 15
.
Water Valve Servo MotorCenter of dash. See Fig. 18 .
ComponentLocation
ABS Speed Sensor Front LHAt left rear of engine compartment. See Fig. 12 .
ABS Speed Sensor & Pad Wear Indicator SW Front
RHRight rear of engine compartment. See Fig. 12 .
ABS Speed Sensor & Pad Wear Indicator SW Rear
RHAt right rear wheel assembly. See Fig. 19 .
ABS Speed Sensor Rear LHAt left rear wheel assembly. See Fig. 19 .
A/C Ambient Temp. SensorBehind left side of bumper fascia. See Fig. 12 .
Acceleration SensorOn left side of luggage compartment, behind left
rear fenderwell. See Fig. 19
.
Accel Position SensorBehind left center of dash. See Fig. 2 .
A/C Pressure SensorOn left front of engine compartment. See Fig. 12 .
A/C Room Temperature SensorBehind left center of dash. See Fig. 2 .
A/C Solar Sensor (Rear)Near center of rear speaker shelf, at base of rear
window. See Fig. 19
.
Airbag Sensor AssemblyFront of center console. See Fig. 2 .
Air Bag Sensor Front LHOn left front of engine compartment. See Fig. 12 .

Air Bag Sensor Front RHOn right front of engine compartment. See Fig. 12 .
Automatic Light Control Sensor & A/C Solar
Sensor (Front)Behind upper center of dash. See Fig. 2 .
Camshaft Position SensorOn front of left cylinder head. See Fig. 12 .
Crankshaft Position SensorOn left front of engine. See Fig. 12 .
Duct Sensor (Driver's Side)Behind upper left side of dash. See Fig. 16 .
Duct Sensor (Front Passenger's Side)Behind upper right side of dash. See Fig. 16 .
Engine Coolant Temp. SensorOn front center of engine. See Fig. 12 .
Engine Oil Level SensorOn left center of engine. See Fig. 12 .
Exhaust Gas SensorOn right side of engine, on exhaust system. See Fig.
12 .
Fuel Pump & Fuel Sender (Main)Under left rear of vehicle, forward of left rear
fenderwell. See Fig. 19
.
Fuel Sender (Sub)Under right rear of vehicle, forward of right rear
fenderwell. See Fig. 19
.
Heated Oxygen Sensor (Bank 1 Sensor 1)On exhaust system, on left side of engine. See Fig.
13 .
Heated Oxygen Sensor (Bank 1 Sensor 2)On exhaust system, below vehicle. See Fig. 16 .
Heated Oxygen Sensor (Bank 2 Sensor 1)On exhaust system, on right side of engine. See Fig.
13 .
Heated Oxygen Sensor (Bank 2 Sensor 2)On exhaust system, below vehicle. See Fig. 16 .
Height Control Sensor Front LHInside left front fenderwell, attached to suspension
control arm. See Fig. 13
.
Height Control Sensor Front RHInside right front fenderwell, attached to suspension
control arm. See Fig. 13
.
Height Control Sensor RearUnder center rear of vehicle. See Fig. 28 .
Height Control Sensor Rear LHLeft rear of luggage compartment. See Fig. 28 .
Height Control Sensor Rear RHRight side of luggage compartment. See Fig. 28 .
Knock Sensor LHOn left side of engine. See Fig. 14 .
Knock Sensor RHOn right side of engine. See Fig. 14 .
Laser SensorBehind right side of front bumper fascia. See Fig.
14 .
Magnetic Field SensorBehind center of dash. See Fig. 17 .
Mass Airflow MeterOn right side of engine compartment, near air box.
See Fig. 14
.
Millimeter Wave Radar SensorFront of engine compartment. See Fig. 14 .
Power Seat Motor And Position Sensor (Driver's
Seat Head Rest Control)In right side of driver's seat back. See Fig. 31 .
Power Seat Motor & Position Sensor (Rear
Passenger's LH Seat Head Rest Top & Bottom
Control)
In left side of rear seat. See Fig. 32 .
Power Seat Motor & Position Sensor (Rear
Passenger's RH Seat Head Rest Top & Bottom In right side of rear seat. See Fig. 32 .

SOLENOIDS & SOLENOID VALVES LOCATION
SWITCHES LOCATION
Washer Level SensorOn washer fluid reservoir, below left headlight. See
Fig. 15
.
Yaw Rate SensorBelow rear of center console. See Fig. 18 .
ComponentLocation
Camshaft Timing Oil Control Valve LHOn front of left cylinder head. See Fig. 12 .
Camshaft Timing Oil Control Valve RHOn front of right cylinder head. See Fig. 12 .
Electronically Controlled Transmission SolenoidOn left side of transmission. See Fig. 12 .
Front Height Control ValveOn right front of engine compartment. See Fig. 13 .
Heated Control Exhaust ValveRight front of vehicle, behind bumper. See Fig. 13 .
PPS SolenoidOn left front of engine compartment. See Fig. 15 .
Rear Height Control ValveNear front of engine compartment. See Fig. 29 .
Rear Magnetic ValveIn rear luggage compartment. See Fig. 29 .
Tension Reducer Solenoid LHNear base of left "B" pillar. See Fig. 30 .
Tension Reducer Solenoid RHNear base of left "B" pillar. See Fig. 30 .
VSV (ACIS)On right rear of engine. See Fig. 15 .
VSV (Canister Closed Valve)On right side of engine compartment. See Fig. 15 .
VSV (EVAP)On left rear of engine. See Fig. 15 .
VSV (Pressure Switching Valve)Below right rear of vehicle. See Fig. 30 .
ComponentLocation
Brake Fluid Level Warning SwitchOn brake master cylinder reservoir. See Fig. 12 .
Brake Pedal Load Sensing SwitchOn brake pedal bracket, above brake pedal. See Fig.
2 .
Buckle SW Front LHInside of left front seat belt buckle. See Fig. 31 .
Buckle SW Front RHInside of right front seat belt buckle. See Fig. 31 .
Climate Control Seat SW (Rear)In rear seat assembly. See Fig. 32 .
Door Courtesy SW Front LHAt left "B" pillar. See Fig. 19 .
Door Courtesy SW Front RHAt right "B" pillar. See Fig. 19 .
Door Courtesy SW Rear LHAt left "C" pillar. See Fig. 19 .
Door Courtesy SW Rear RHAt right "C" pillar. See Fig. 19 .
Door Key Lock Motor & Door Unlock Detection
SW Front RHIn right front door. See Fig. 19 .
Door Key Lock & Unlock SW & Door Lock Motor
& Door Unlock Detection SW Front LHIn driver's door. See Fig. 19 .
Door Lock Motor & Door Unlock Detection SW

MISCELLANEOUS LOCATION
Rear LHIn left rear door. See Fig. 19 .
Door Lock Motor & Door Unlock Detection SW
Rear RHIn right rear door. See Fig. 19 .
Engine Hood Courtesy SWNear hood latch, on front center of engine
compartment. See Fig. 12
.
Head Rest Limit SW Rear LHIn rear seat assembly. See Fig. 32 .
Head Rest Limit SW Rear RHIn rear seat assembly. See Fig. 32 .
Luggage Compartment Door Key Unlock SWIn luggage compartment. See Fig. 28 .
Luggage Electrical Key SWIn luggage compartment decklid. See Fig. 28 .
Oil Pressure SwitchOn lower left front of engine. See Fig. 15 .
Parking Brake SwitchBehind left end of dash, on parking brake
mechanism. See Fig. 17
.
Park/Neutral Position SwitchOn right side of transmission. See Fig. 15 .
Power Seat Control SW (Rear Seat)Left side of rear seat. See Fig. 32 .
Pressure SwitchLower left side of dash. See Fig. 17 .
Rear Armrest Courtesy SWIn rear seat. See Fig. 32 .
Rear Sunshade SW (Rear)In center of rear seat. See Fig. 32 .
Stoplight SwitchAbove brake pedal, on bracket. See Fig. 18 .
ComponentLocation
A/C AmplifierIn luggage compartment. See Fig. 4 .
Airbag Squib (Front Passenger Airbag Assembly)Right side of dash. See Fig. 2 .
Airbag Squib (Steering Wheel Pad)In steering wheel. See Fig. 2 .
Curtain Shield Airbag Squib LHLeft "C" pillar. See Fig. 19 .
Curtain Shield Airbag Squib RHRight "C" pillar. See Fig. 19 .
Data Link Connector 3Below left side of dash. See Fig. 16 .
Door Oscillator Front LHIn left front door. See Fig. 19 .
Door Oscillator Front RHIn right front door. See Fig. 19 .
Door Oscillator Rear LHIn left rear door. See Fig. 19 .
Door Oscillator Rear RHIn right rear door. See Fig. 19 .
GeneratorRight front of engine. See Fig. 13 .
Horn (High)On center radiator support. See Fig. 13 .
Horn (Low)On center radiator support. See Fig. 13 .
Ignition Coil & Ignitor No. 1Above No. 1 spark plug. See Fig. 14 .
Ignition Coil & Ignitor No. 2Above No. 2 spark plug. See Fig. 14 .
Ignition Coil & Ignitor No. 3Above No. 3 spark plug. See Fig. 14 .
Ignition Coil & Ignitor No. 4Above No. 4 spark plug. See Fig. 14 .
Ignition Coil & Ignitor No. 5Above No. 5 spark plug. See Fig. 14 .
Ignition Coil & Ignitor No. 6Above No. 6 spark plug. See Fig. 14 .

CONNECTORS LOCATION
Luggage Oscillator (Outer)Behind right side of rear bumper. See Fig. 28 .
Noise FilterOn luggage room J/B. See Fig. 11 .
Noise Filter (Ignition) (Left Bank)On left rear of engine. See Fig. 15 .
Noise Filter (Ignition) (Right Bank)On right front of engine. See Fig. 15 .
Noise Filter (Rear Window Defogger)Behind left headlight. See Fig. 15 .
Pretensioner Front LHNear base of left "B" pillar. See Fig. 29 .
Pretensioner Front RHNear base of right "B" pillar. See Fig. 29 .
Pretensioner Rear LHNear base of left "C" pillar. See Fig. 29 .
Pretensioner Rear RHIn right rear door. See Fig. 29 .
Rear Window DefoggerAt rear window. See Fig. 29 .
RheostatLeft side of dash. See Fig. 18 .
Room Oscillator (Front)In center console. See Fig. 18 .
Room Oscillator (Rear)Center of passenger compartment. See Fig. 29 .
Seat Heater Front LHIn left front seat. See Fig. 31 .
Seat Heater Front RHIn right front seat. See Fig. 31 .
Seat Heater Rear LHIn left rear seat. See Fig. 32 .
Seat Heater Rear LHIn left side of rear seat. See Fig. 32 .
Seat Heater Rear RHIn right rear seat. See Fig. 32 .
Seat Heater Rear RHIn right side of rear seat. See Fig. 32 .
Short Connector 1Left front of engine compartment. See Fig. 15 .
Short Connector 2Left front of engine compartment. See Fig. 15 .
Short Connector 8 (Height Control)Right end of dash. See Fig. 18 .
Short Connector 9 (Height Control)Right end of dash. See Fig. 18 .
Short Connector 43Right end of dash. See Fig. 17 .
Short Connector 43Right end of dash. See Fig. 18 .
Side Airbag Squib LHIn left front seat. See Fig. 31 .
Side Airbag Squib RHIn right front seat. See Fig. 31 .
Stereo Component AmplifierOn right side of luggage compartment, behind trim.
See Fig. 4
.
Telephone Transceiver & Speaker RelayOn right side of luggage compartment. See Fig. 4 .
Theft Deterrent HornOn right rear of engine compartment. See Fig. 15 .
Transponder Key AmplifierOn right side of steering column. See Fig. 18 .
Vibrator LHIn left rear seat. See Fig. 32 .
Vibrator RHIn right rear seat. See Fig. 32 .
ComponentLocation
BA1 (White, 6 Pin)At left "B" pillar. See Fig. 23 .
BA2 (White, 10 Pin)At left "B" pillar. See Fig. 23 .

BB1 (White, 6 Pin)At right "B" pillar. See Fig. 23 .
BB2 (White, 10 Pin)At right "B" pillar. See Fig. 23 .
BC2 (White, 16 Pin)Left rear of luggage compartment. See Fig. 23 .
BD1 (White, 10 Pin)Behind left side of rear bumper. See Fig. 23 .
BE3 (White, 16 Pin)Behind right rear bumper. See Fig. 23 .
BE4 (Gray, 22 Pin)Behind right rear bumper. See Fig. 23 .
BF2 (White, 20 Pin)Under driver's seat. See Fig. 26 .
BG3 (White, 20 Pin)Under passenger seat. See Fig. 26 .
BH2 (White, 25 Pin)Lower left side of rear seat. See Fig. 27 .
BH3 (White, 17 Pin)Lower left side of rear seat. See Fig. 27 .
BI2 (White, 25 Pin)Right rear seat bottom. See Fig. 27 .
BI3 (White, 17 Pin)Right rear seat bottom. See Fig. 27 .
BJ1 (White, 10 Pin)In left front door. See Fig. 25 .
BK1 (White, 10 Pin)In right front door. See Fig. 25 .
BL1 (White, 10 Pin)In left rear door. See Fig. 25 .
BM1 (White, 10 Pin)Right "B" pillar. See Fig. 25 .
BN1 (White, 2 Pin)Right front floor pan. See Fig. 25 .
BO1 (White, 11 Pin)Left rear of luggage compartment. See Fig. 25 .
BP1 (White, 4 Pin)Left rear of luggage compartment. See Fig. 25 .
BQ1 (White, 10 Pin)Left rear luggage compartment. See Fig. 25 .
BR1 (Gray, 3 Pin)Left rear luggage compartment. See Fig. 25 .
BS1 (White, 8 Pin)Left side of rear seat. See Fig. 27 .
BT1 (White, 20 Pin)Center of rear seat. See Fig. 27 .
BT2 (White, 10 Pin)Center rear seat. See Fig. 27 .
BU1 (White, 20 Pin)Center of rear seat. See Fig. 27 .
BV1 (White, 8 Pin)In right rear seat back. See Fig. 27 .
EA1 (Black, 8 Pin)Under left headlight. See Fig. 3 .
EB1 (White, 14 Pin)Inside ECU box. See Fig. 3 .
EB2 (White, 10 Pin)Inside ECU box. See Fig. 3 .
EC1 (White, 3 Pin)Behind intake manifold. See Fig. 3 .
EC2 (Black, 6 Pin)Center rear of engine compartment. See Fig. 3 .
ED1 (Black, 6 Pin)Right front of engine compartment. See Fig. 3 .
IA1 (White, 17 Pin)At left kick panel. See Fig. 20 .
IB1 (Yellow, 2 Pin)At left side of dash. See Fig. 20 .
IB5 (White, 18 Pin)Left end of dash. See Fig. 20 .
IB6 (White, 18 Pin)Left end of dash. See Fig. 20 .
IB7 (White, 25 Pin)Left end of dash. See Fig. 20 .
IC4 (Gray, 22 Pin)Left end of dash. See Fig. 20 .
IC5 (White, 17 Pin)Left end of dash. See Fig. 20 .
ID2 (White, 20 Pin)Left end of dash. See Fig. 20 .
IE1 (White, 2 Pin)At left kick panel. See Fig. 20 .
IF3(Wht 14P )

GROUNDS LOCATION
Under center console. See Fig. 22 .
IF4 (White, 25 Pin)Under center console. See Fig. 22 .
IF5 (White, 22 Pin)Under center console. See Fig. 22 .
IG3 (White, 18 Pin)Right side of dash. See Fig. 22 .
IG4 (White, 25 Pin)Right side of dash. See Fig. 22 .
IH1 (Yellow, 2 Pin)At right side of dash. See Fig. 22 .
IH4 (White, 22 Pin)Right side of dash. See Fig. 22 .
II1 (White, 22 Pin)At right side of dash. See Fig. 22 .
II2 (White, 9 Pin)At right side of dash. See Fig. 22 .
IJ1 (White, 17 Pin)At right kick panel. See Fig. 22 .
IK1 (White, 4 Pin)Center of dash. See Fig. 22 .
ComponentLocation
BLAt left rear floor partition panel. See Fig. 24 .
BMAt left rear quarterpanel. See Fig. 24 .
BNAt right rear floor partition panel. See Fig. 24 .
BOAt right rear quarterpanel. See Fig. 24 .
BPAt left rear seat back. See Fig. 27 .
BQAt right rear seat back. See Fig. 27 .
EAAt right radiator side support. See Fig. 3 .
EBUnder fusible link block. See Fig. 3 .
ECAt left radiator side support. See Fig. 3 .
EDAt top left of dash. See Fig. 3 .
EEOn right cylinder head. See Fig. 3 .
EFOn left cylinder head. See Fig. 3 .
IGAt left side of dash. See Fig. 21 .
IHAt right side of shift lever. See Fig. 21 .
IIAt right side of shift lever. See Fig. 21 .
IJAt right dash brace. See Fig. 21 .
IKAt right side of dash. See Fig. 21 .
IRUnder right front seat. See Fig. 21 .

3.INSPECT EVAPORATIVE EMISSION CONTROL SYSTEM
a. Start the engine. Disconnect the vacuum hose as shown in the illustration.
b. From the hand-held tester ACTIVE TEST mode, select PURGE VSV. Check that a vacuum occurs
at the VSV port.
c. Exit ACTIVE TEST mode and reconnect the vacuum hose.
d. From the hand-held tester ECU DATA MONITOR mode, select PURGE VSV. Check operation of
the purge VSV.
e. Warm up the engine and drive the vehicle. Confirm that the purge VSV is turned from OFF to ON.
Fig. 7: Checking Vacuum

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
4.VISUALLY INSPECT HOSES, CONNECTIONS AND GASKETS
a. Check for cracks, leaks or damage.
HINT:
Possible leakage points are indicated in the illustration.
Removal or problems with the engine oil dipstick, filler cap, PCV hose and other components may
cause the engine to run improperly. Disconnection, looseness or cracks in the parts of the air
induction system between the throttle body and cylinder head will allow air suction and cause the
engine trouble.