2003 LEXUS LS430 Factory Repair Manual

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Page 2625 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 91: Disconnecting E2 Connector From ECM
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (DLC3 - ECM)
OK: Go To Next Step.
2.CHECK HARNESS AND CONNECTO

Page 2626 of 4500

LEXUS LS430 2003 Factory Repair Manual OK: Go To Next Step.
3.CHECK HARNESS AND CONNECTOR (TC of DLC3 - BODY GROUND)
a. Measure the resistance according to the value(s) in the table below.
Standard:
ECM CONNECTOR TERMINALS RESISTANCE

Page 2627 of 4500

LEXUS LS430 2003 Factory Repair Manual BUZZERS, RELAYS & TIMERS LOCATION
CIRCUIT PROTECTION DEVICES LOCATION
ComponentLocation
ABS CUT RelayOn engine room No. 3 R/B. See Fig. 7 .
ABS MTR RelayOn engine room No. 3 R/B. See Fig. 7 .
A/C CO

Page 2628 of 4500

LEXUS LS430 2003 Factory Repair Manual CONTROL UNITS LOCATION
Blower Motor ResistorCenter rear of vehicle. See Fig. 29 .
Engine Room No. 1 J/BOn left front of engine compartment, behind
headlight. See Fig. 1
.
Engine Room No. 1 R/BOn le

CONTROL UNITS LOCATION
Blower Motor ResistorCenter rear of vehicle. See Fig. 29 .
Engine Room No. 1 J/BOn left front of engine compartment, behind
headlight. See Fig. 1
.
Engine Room No. 1 R/BOn left front of engine compartment, behind
headlight. See Fig. 1
.
Engine Room No. 2 R/BOn left front of engine compartment, behind
headlight. See Fig. 1
.
Engine Room No. 3 R/BOn left rear of engine compartment. See Fig. 1 .
Fuel Pump ResistorLeft rear of engine compartment. See Fig. 13 .
Fusible Link BlockOn right rear of engine compartment. See Fig. 1 .
Luggage Room J/BOn left side of luggage compartment. See Fig. 4 .
Overhead J/BAt front of roof opening. See Fig. 4 .
ComponentLocation
AFS ECURight side of dash. See Fig. 2 .
Air Suspension ECUBehind right side of dash. See Fig. 2 .
Canister Pump ModuleLeft rear of vehicle. See Fig. 19 .
Clearance Sonar ECUOn left side of luggage compartment. See Fig. 4 .
Climate Control Seat ECU (Driver's Seat)Under right side of driver's seat. See Fig. 31 .
Climate Control Seat ECU (Front Passenger's Seat)Under front passenger's seat. See Fig. 31 .
Climate Control Seat ECU (Rear LH Seat)In left side of rear seat. See Fig. 32 .
Climate Control Seat ECU (Rear RH Seat)In right side of rear seat. See Fig. 32 .
Cooling Fan ECUOn front center of engine compartment, on radiator
support. See Fig. 1
.
Distance Control ECUBehind right side of dash. See Fig. 16 .
Door Lock Control ReceiverRight rear of luggage compartment. See Fig. 19 .
Driver Door ECUInside front of left front door. See Fig. 4 .
Driver Seat ECUBelow left side of driver's seat. See Fig. 31 .
Driver Side J/B ECUAt left kick panel. See Fig. 16 .
Engine Control ModuleOn left front of engine compartment, in protective
case. See Fig. 1
.
Front ControllerOn engine room No. 2 R/B. See Fig. 6 .
Front Passenger Door ECUInside right front door. See Fig. 4 .
Gateway ECUBehind left end of dash. See Fig. 16 .
Headlight Control ECU LHBehind left headlight. See Fig. 1 .
Headlight Control ECU RHBehind right headlight. See Fig. 1 .
Luggage Room J/B ECUOn left side of luggage compartment. See Fig. 4 .
Moon Roof Control ECUAt front of roof opening. See Fig. 4 .
On lower right side of luggage compartment. See

Page 2629 of 4500

LEXUS LS430 2003 Factory Repair Manual MOTORS LOCATION
Navigation ECUFig. 4 .
Passenger Side J/B ECUAt right kick panel. See Fig. 17 .
Power Tilt & Power Telescopic ECUBehind left side of dash. See Fig. 17 .
PPS ECURight side of dash. See

MOTORS LOCATION
Navigation ECUFig. 4 .
Passenger Side J/B ECUAt right kick panel. See Fig. 17 .
Power Tilt & Power Telescopic ECUBehind left side of dash. See Fig. 17 .
PPS ECURight side of dash. See Fig. 17 .
Rear Door LH ECUInside left rear door. See Fig. 4 .
Rear Door RH ECUInside right rear door. See Fig. 4 .
Rear LH Seat ECUBehind left side of rear seat back. See Fig. 32 .
Rear RH Seat ECUBehind right side of rear seat back. See Fig. 32 .
Seat Belt Control ECULeft side of luggage compartment. See Fig. 4 .
Seat Climate Controller Front LH (Seat Back)In driver's seat back. See Fig. 31 .
Seat Climate Controller Front RH (Seat Back)In passenger's seat back. See Fig. 31 .
Seat Climate Controller Rear LH (Seat Back)In left rear seat back. See Fig. 32 .
Seat Climate Controller Rear LH (Seat Cushion)In left rear seat cushion. See Fig. 32 .
Seat Climate Controller Rear RH (Seat Back)In right rear seat back. See Fig. 32 .
Seat Climate Controller Rear RH (Seat Cushion)In right rear seat cushion. See Fig. 32 .
Shift Lock Control ECUBelow shift lever, in center console. See Fig. 18 .
Skid Control ECU W/ActuatorBehind left side of dash. See Fig. 1 .
Steering Lock ECULeft side of dash. See Fig. 18 .
Stereo Component TunerOn lower right side of luggage compartment. See
Fig. 4
.
Television Camera ECURight rear of luggage compartment. See Fig. 4 .
Theft Deterrent ECUBehind upper right center of dash. See Fig. 18 .
Transponder Key ComputerBehind upper center of dash. See Fig. 18 .
Vibration Seat ECU LHBehind left rear seat back. See Fig. 32 .
Vibration Seat ECU RHIn rear seat assembly. See Fig. 32 .
ComponentLocation
Air Inlet Control Servo MotorRight side of dash. See Fig. 2 .
Air Mix Control Servo Motor (Driver Side)Center of dash. See Fig. 2 .
Air Mix Control Servo Motor (Front Passenger
Side)Right side of dash. See Fig. 2 .
Air Vent Mode Control Servo Motor (Driver Side)Center of dash. See Fig. 2 .
Air Vent Mode Control Servo Motor (Front
Passenger Side)Center of dash. See Fig. 2 .
Blower MotorBehind lower right side of dash. See Fig. 2 .
Cool Air Bypass Servo Motor (Driver's Side)Left side of dash. See Fig. 2 .
Cool Air Bypass Servo Motor (Front Passenger
Side)Right side of dash. See Fig. 2 .
Front Wiper MotorBelow left side of windshield. See Fig. 13 .

Page 2630 of 4500

LEXUS LS430 2003 Factory Repair Manual Fuel Lid Opener MotorOn left side of luggage compartment, behind left
rear fenderwell. See Fig. 19
.
Headlight Beam Level Control Actuator LHBehind left headlight. See Fig. 13 .
Headlight Beam Level

Fuel Lid Opener MotorOn left side of luggage compartment, behind left
rear fenderwell. See Fig. 19
.
Headlight Beam Level Control Actuator LHBehind left headlight. See Fig. 13 .
Headlight Beam Level Control Actuator RHBehind right headlight. See Fig. 13 .
Headlight Cleaner MotorBelow left headlight. See Fig. 13 .
Height Control CompressorOn right front of engine compartment. See Fig. 13 .
Luggage Compartment Door Closer MotorOn center rear of luggage compartment lid. See Fig.
28 .
Power Seat Module (Rear Passenger's RH Seat Slide
Control)Right side of rear seat. See Fig. 32 .
Power Seat Motor (Driver's Seat Cushion Control)Lower left side of driver's seat. See Fig. 31 .
Power Seat Motor (Driver's Seat Front Vertical
Control)Lower left side of driver's seat. See Fig. 31 .
Power Seat Motor (Driver's Seat Lifter Control)Lower right side of driver's seat bottom. See Fig.
31 .
Power Seat Motor (Driver's Seat Lumbar Support
Lower Side Control)Lower right side of driver's seat cushion. See Fig.
31 .
Power Seat Motor (Driver's Seat Lumbar Support
Upper Side Control)Upper right side of driver's seat back. See Fig. 31 .
Power Seat Motor (Driver's Seat Reclining Control)Lower left rear side of driver's seat bottom. See Fig.
31 .
Power Seat Motor (Driver's Seat Slide Control)In lower left side of driver's seat cushion. See Fig.
31 .
Power Seat Motor (Front Passenger's Seat Front
Vertical Control)In lower right side of front passenger's seat bottom.
See Fig. 31
.
Power Seat Motor (Front Passenger's Seat Head
Rest Control)In upper left side of front passenger's seat back. See
Fig. 31
.
Power Seat Motor (Front Passenger's Seat Lifter
Control)In lower left side of front passenger's seat bottom.
See Fig. 31
.
Power Seat Motor (Front Passenger's Seat Lumbar
Support Control)Lower left rear of front passenger seat cushion. See
Fig. 31
.
Power Seat Motor (Front Passenger's Seat Reclining
Control)Lower right side of front passenger's seat. See Fig.
31 .
Power Seat Motor (Front Passenger's Seat Slide
Control)Under passenger's seat cushion. See Fig. 31 .
Power Seat Motor (Rear Passenger's LH Seat Slide
Control)Left side of rear seat. See Fig. 32 .
Power Window Motor Front LHIn left front door. See Fig. 29 .
Power Window Motor Front RHIn right front door. See Fig. 29 .
Power Window Motor Rear LHIn left rear door. See Fig. 29 .
Power Window Motor Rear RHIn right rear door. See Fig. 29 .
Rear Blower MotorCenter rear of vehicle. See Fig. 29 .
Rear Damper Servo MotorRear center of luggage compartment. See Fig. 29 .

Page 2631 of 4500

LEXUS LS430 2003 Factory Repair Manual 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

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 .

Page 2632 of 4500

LEXUS LS430 2003 Factory Repair Manual 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 SensorO

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 .

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