WHEN REMOVING,INSTALLING,REPAIRING OR REPLACING PARTS PROCEDURES NECESSARY WHEN ECU OR OTHER PARTS ARE REPLACED

Refer to the LEXUS Repair Manual for each work procedure.


  1. PROCEDURES NECESSARY WHEN ECU OR OTHER PARTS ARE REPLACED

    Replacement Part Necessary Procedure Effect/Inoperative Function when Necessary Procedures are not Performed Note
    ECM assembly Perform Vehicle Identification Number (VIN) registration MIL illuminates -

    • Throttle body with motor assembly

    • Cleaning the deposits from the throttle body with motor assembly

    • Engine assembly

    • Cylinder head sub-assembly

    • Camshaft (for intake or exhaust camshaft)

    • Camshaft timing gear assembly

    • Camshaft timing exhaust gear assembly

    • Piston or piston ring

    • Mass air flow meter sub-assembly

    • Fuel injector assembly (for port injection)

    • Fuel injector assembly (for direct injection)

    • Fuel pump assembly (for low pressure side)

    • Fuel pump assembly (for high pressure side)

    • Fuel pressure sensor (for low pressure side)

    • Fuel pressure sensor (for high pressure side)

    • Air fuel ratio sensor

    • Heated oxygen sensor*9

    • Engine coolant temperature sensor

    • Spark plug

    • Ignition coil assembly

    • EGR valve assembly

    • Air leaks from intake system

    • Gas leaks from exhaust system

    • Knock control sensor

    		 Inspection After Repair

    • Poor idle, etc.

    • Engine start function, etc.

    		 -
    Millimeter wave radar sensor assembly Adjust millimeter wave radar sensor assembly

    • Dynamic radar cruise control system

    • Pre-crash safety system

    • Forward recognition camera system

    • LKA/LDA system

    		 -

    • Forward recognition camera

    • Windshield glass

    		 Adjust forward recognition camera

    • Dynamic radar cruise control system

    • Pre-crash safety system

    • Forward recognition camera system

    • LKA/LDA system

    • Road sign assist system

    • Adaptive high beam system

    • Automatic high beam system

    		 -
    Absorber Control ECU Perform registration of vehicle identification information

    • Interrupts damping force control

    • DTCs are stored

    		 -

    • Tire pressure warning ECU and receiver (Electrical key and tire pressure monitoring system receiver assembly)*1

    • Tire pressure warning ECU and receiver (Tire pressure monitoring system receiver assembly)*2

    • Tire pressure warning valve and transmitter

    • Register Transmitter ID

    • Initialize tire pressure warning system

    • When DTC detection conditions of "transmitter ID not received" DTC are met, TPWS indicator blinks for 1 minute, and then illuminates.

    • Tire pressure warning function

    		 -

    • Skid control ECU assembly

    • Yaw rate and acceleration sensor

    • Clear stored linear solenoid valve calibration data

    • Perform initialization and calibration of the linear solenoid valve

    • Clear zero point calibration data

    • Perform yaw rate and acceleration sensor zero point calibration

    • DTCs are stored

    • ABS warning light illuminates

    • Brake warning light/yellow (minor malfunction) illuminates

    • Slip indicator light illuminates

    • VSC disabled or malfunctions

    • Theft deterrent system (Tilt sensor)

    		 -

    • Brake pedal stroke sensor assembly

    • Brake pedal support assembly

    • Clear stored linear solenoid valve calibration data

    • Perform initialization and calibration of the linear solenoid valve
    Brake actuator assembly

    • Bleed air

    • Clear stored linear solenoid valve calibration data

    • Perform initialization and calibration of the linear solenoid valve
    Parking Brake ECU assembly Operate the electric parking brake switch assembly Parking brake indicator light (red) blinks when the engine switch is first turned on (IG) -
    Power steering ECU assembly

    • Torque Sensor Zero Point Calibration

    • Assist Map Writing

    • DTCs are output

    • Steering effort different between turning steering wheel left and right

    • EPS warning light illuminates

    		 -
    Electric power steering column sub-assembly Torque Sensor Zero Point Calibration

    • Radio receiver assembly*3

    • Telematics transceiver*4

    		 Vehicle contract setting

    • G-BOOK service

    • Emergency call service

    for Initialization*4

    for Initialization*5
    Radio receiver assembly*4 Download necessary data Some G-BOOK service content will be unavailable.

    for Registration*4

    for Registration*5
    Clearance warning ECU assembly Registration of bumper type LEXUS parking assist-sensor system -
    Ultrasonic sensor (front left sensor, front left center sensor, front right center sensor, front right sensor) Initialization of ultrasonic sensors (front left sensor, front left center sensor, front right center sensor, front right sensor)
    Ultrasonic sensor (rear left sensor, rear left center sensor, rear right center sensor, rear right sensor) Initialization of ultrasonic sensors (rear left sensor, rear left center sensor, rear right center sensor, rear right sensor)
    Radio receiver assembly Parking assist monitor system initialization Parking assist monitor system (w/ Parallel parking assist function) -
    Steering sensor

    • Steering angle neutral point (Initialize parking assist monitor system)

    • Steering angle setting

    • Suspension, tires, etc.*6

    • Rear television camera assembly

    		 Rear television camera assembly optical axis (Back camera position setting)
    Steering sensor

    • Steering angle neutral point (Initialize parking assist monitor system)

    • Steering angle setting

    		 Parking assist monitor system (w/o Parallel parking assist function) -
    Rear television camera assembly

    • Parking assist monitor system initialization

    • Rear television camera assembly optical axis (Back camera position setting)
    Suspension, tires, etc.*6 Rear television camera assembly optical axis (Back camera position setting)
    Blind spot monitor sensor Blind spot monitor beam axis inspection DTCs are output -
    Steering sensor Steering angle neutral point (Initialize panoramic view monitor system) Panoramic view monitor system -
    Parking assist ECU

    • Parking assist ECU initialization

    • Adjust steering angle
    Rear television camera assembly Rear television camera view adjustment

    • Front television camera assembly

    • Front bumper assembly

    • Radiator grille

    		 Front television camera view adjustment

    • Side television camera assembly LH

    • Outer rear view mirror assembly LH

    • Side television camera assembly RH

    • Outer rear view mirror assembly RH

    		 Side television camera view adjustment

    • Front television camera assembly or radiator grille assembly

    • Rear television camera assembly

    • Side television camera assembly LH or outer rear view mirror assembly LH

    • Side television camera assembly RH or outer rear view mirror assembly RH

    		 Television camera view adjustment
    Suspension, tires, etc.*6

    • Parking assist ECU initialization

    • Adjust steering angle

    • Certification ECU (smart key ECU assembly)

    • ID code box (immobiliser code ECU)

    • Steering lock ECU (steering lock actuator or upper bracket assembly)

    • Electrical key transmitter sub-assembly

    • Hybrid vehicle control ECU assembly

    • Main body ECU (multiplex network body ECU)

    • Telematics transceiver

    		 Perform code registration (Immobiliser system)

    • Wireless door lock control system

    • Smart entry and start system

    • Hybrid control system cannot be started

    • Steering lock system

    • Telematics system

    		 See Service Bulletin for the registration method.

    • Occupant detection ECU*7

    • Front passenger seat*7

    		 Zero point calibration (Occupant classification system)

    • Occupant classification system

    • Passenger airbag ON/OFF indicator

    • Airbag system (Front passenger side)

    • Seat belt warning system (Front passenger)

    		 -

    • Position control ECU and switch assembly (driver seat)

    • Front seatback frame sub-assembly (driver seat)

    • Front seat adjuster assembly (driver seat)

    • Position control ECU and switch assembly (front passenger seat)

    • Front seatback frame sub-assembly (front passenger seat)

    • Front seat adjuster assembly (front passenger seat)

    		 Initialize position control ECU Front Power Seat Control System (w/ Memory) -

    • Fold seat control ECU (for LH side)

    • Fold seat control ECU (for RH side)

    • Rear seatback frame sub-assembly LH

    • Rear seatback frame sub-assembly RH

    		 Initial position memorization Rear power seat function -

    • No. 1 air conditioning radiator damper servo sub-assembly

    • No. 2 air conditioning radiator damper servo sub-assembly

    • No. 3 air conditioning radiator damper servo sub-assembly

    • No. 1 blower damper servo sub-assembly

    • Air conditioning amplifier assembly

    		 Initialize servo motor (Air conditioning system) DTCs are stored -

    • Door window regulator assembly

    • Power window regulator motor sub-assembly

    • Door glass

    • Door glass run

    		 Initialize Power Window Control System

    • Auto up and down function

    • Jam protection function

    • Remote control function

    • Key-linked function

    • Wireless transmitter-linked function

    • Key-off operation function

    • Catch protection function

    • Window open warning function

    		 -

    • Sliding roof ECU (sliding roof drive gear sub-assembly)

    • Sliding roof glass sub-assembly

    • Sliding roof drive cable sub-assembly

    		 Initialize Sliding Roof System

    • Auto operation function

    • Jam protection function

    • Key-off operation function

    • Key-linked function

    • Wireless transmitter-linked function

    • Sliding roof open warning function

    		 -

    • Sliding roof ECU (sliding roof drive gear)

    • Slide roof housing panel

    • Slide roof rail sub-assembly

    • Sliding roof glass sub-assembly

    		 Initialize panoramic moon roof system (for Sliding Roof)

    • Auto operation function

    • Jam protection function

    • Key-off operation function

    • Key-linked function

    • Wireless transmitter linked function

    • Sliding roof open warning function

    		 -

    • Roof sunshade ECU (sliding roof drive gear assembly)

    • Sunshade trim sub-assembly

    • Slide roof rail sub-assembly

    		 Initialize panoramic moon roof system (for Roof Sunshade)

    • Auto operation function

    • Jam protection function

    • Key-off operation function
    Multiplex network door ECU*8 Reset Back Door Close Position Power back door system -
    Headlight ECU sub-assembly LH

    • Synchronize vehicle information

    • Initialize headlight ECU sub-assembly LH

    • Adaptive high beam system

    • Automatic headlight beam level control system

    		 -
    Rear height control sensor sub-assembly RH Initialize headlight ECU sub-assembly LH
    Suspension, tires, etc.*6

    • *1: for Tire Pressure Warning ECU and Receiver Integrated with Electrical Key Receiver

    • *2: for Tire Pressure Warning ECU and Receiver (Stand Alone)

    • *3: w/ G-BOOK System

    • *4: w/ Telematics Transceiver

    • *5: w/o Telematics Transceiver

    • *6: The vehicle height changes because of suspension or tire replacement

    • *7: w/ Occupant Classification System

    • *8: w/ Power Back Door System

    • *9: for 2GR-FXS (w/ Canister Pump Module)