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

    Procedures necessary when ECU or other parts are replaced
    Replacement Part Necessary Procedures Effect / Inoperative Function When Necessary Procedures are not Performed Note
    ECM Register VIN - -
    Hybrid vehicle control ECU Register cruise control system Cruise control system -

    • Hybrid vehicle control ECU

    • Hybrid vehicle transmission assembly

    		 Perform clutch oil pressure value learning initialization Large shift shock -

    • Suspension control ECU

    • Height control sensor

    • Vehicle height offset calibration

    • Registration of vehicle identification information

    • Vehicle height sensor data may be affected due to installation position, or vehicle height recognition may be erroneous

    • DTC C1789 is output

    • Negative effect on the other systems

    		 -

    • Tire pressure warning ECU and receiver

    • Tire pressure warning valve and transmitter

    1. Register transmitter IDs

    2. Initialization

    • When DTC detection conditions of "transmitter ID not received" DTC is met, tire pressure blinks for 1 minute, and then illuminates

    • Tire pressure monitoring function

    		 -
    Skid control ECU

    • Initialize linear solenoid valve and perform calibration

    • Perform yaw rate and acceleration sensor zero point calibration

    • Brake warning light / yellow (minor malfunction) illumination

    • Brake warning light / red (malfunction)

    • ABS warning light illumination

    • Slip indicator light illumination

    		 -
    Brake actuator

    • Bleed air

    • Clear stored value of linear solenoid valve and calibration data

    • Initialize linear solenoid valve and perform calibration

    		 Brake does not operate properly -

    • Brake pedal stroke sensor

    • Brake pedal

    • Inspect and adjust brake pedal height

    • Clear stored value of linear solenoid valve and calibration data

    • Initialize linear solenoid valve and perform calibration

    • Brake warning light / yellow (minor malfunction) illumination

    • Brake warning light / red (malfunction)

    • ABS warning light illumination

    • Master warning light illumination

    		 -
    Yaw rate sensor

    • Clear zero point calibration data

    • Perform yaw rate and acceleration sensor zero point calibration

    • Brake warning light / yellow (minor malfunction) illumination

    • Brake warning light / red (malfunction)

    • ABS warning light illumination

    • Slip indicator light illumination

    • VSC control is prohibited or operation is incorrect

    • VGRS system

    		 -
    Electric parking brake ECU

    • Reset memory

    • Acquire tension sensor zero point

    		 Electric parking brake does not operate normally -
    Parking brake with bracket actuator assembly

    • Reset memory

    • Acquire tension sensor zero point

    • Parking brake bedding

    • Electric parking brake does not operate normally

    • Parking brake performance may not be normal

    • Rear disc

    • Parking brake shoe

    		 Parking brake bedding Parking brake performance may not be normal

    • Power steering link assembly

    • Steering control ECU

    • Steering column

    • Steering intermediate shaft

    		 Actuator angle neutral point calibration and initialization Steering wheel off-center -
    Power steering link assembly

    • Actuator angle neutral point calibration and initialization

    • Rotation angle sensor value initialization

    • Torque sensor zero point calibration

    • VGRS system calibration procedure

    • Steering wheel off-center

    • Difference in amount of steering assist between left and right

    		 -
    Power steering ECU

    • Rotation angle sensor value initialization

    • Torque sensor zero point calibration

    • Steering wheel off-center

    • Difference in amount of steering assist between left and right
    Driving support ECU Initialize driving support ECU Systems controlled by driving support ECU do not operate -

    • ID code box

    • Steering lock ECU

    • Hybrid vehicle control ECU

    • Key

    • Certification ECU

    		 Registration

    • Wireless door lock operation

    • Entry operation

    • Engine starting

    • Steering unlock

    		 Refer to service Bulletin for registration procedure
    Rear bumper cover Inspect rear millimeter wave radar sensor (Rear radar sensor check) Rear millimeter wave radar sensor sensitivity may decrease -
    Rear millimeter wave radar sensor Adjust rear millimeter wave radar sensor DTC C1A13 or C1A15 is output -
    Front millimeter wave radar sensor Adjust front millimeter wave radar sensor DTC C1A11 or C1A14 is output -

    • Object recognition ECU

    • Object recognition camera sensor

    		 Adjust object recognition camera DTC C1A22 or C1A23 is output -

    • No. 1 night view ECU

    • Object recognition camera (night view camera)

    		 Adjust object recognition camera (night view camera) DTC B281A, B2827, C1A22 AND C1A3 are output -

      w/ Telematics System

    • Multi-media module receiver assembly

    • Telematics transceiver

    		 Vehicle contract setting G-BOOK function -

      w/ Telematics System

    • Multi-media module receiver assembly

    		 Download necessary data Some G-BOOK service content will be unavailable -
    Multi-media module receiver assembly Parking assist monitor system initialize Parking assist function -
    Steering angle sensor Parking assist monitor system initialize

    • VGRS system

    • Parking assist function
    Suspension, tires, etc. Television camera optical axis (Camera position setting) Vehicle width extension lines and expected course are deviated
    Television camera assembly
    Windshield glass Adjust adaptive high beam camera beam axis DTC B2454 output -
    Inner rear view mirror assembly

    • Registration

    • Adjust Adaptive High Beam Camera Beam Axis

    • Garage door opener function

    • DTC B2454 output

    • Adaptive High Beam does not operate normally

    		 -

    • Door window regulator assembly

    • Power window regulator motor assembly

    • Door glass

    • Door glass run

    		 Initialize power window control system

    • Auto up/down function

    • Jam protection function

    • Catch protection function

    • Remote control function

    • Key-linked function

    • Wireless transmitter-linked function

    • Key-off operation function

    • Window open warning function

    		 -

    • Front power seat switch

      (Seat ECU)

    • Front seat adjuster

    		 Position sensor initialization

    • During manual operation, buzzer sounds

    • Memory function does not operate

    • Interference stop control does not operate normally

    • Linked control does not operate normally

    		 -

    • Position control ECU

    • Rear seat adjuster

    		 Position sensor initialization

    • During manual operation, buzzer sounds

    • Memory function does not operate

    • Interference stop control does not operate normally

    • Linked control does not operate normally

    		 -

    • RR MPX-B1 fuse

    • Luggage closer motor assembly

    • Luggage door closer assembly

    		 Reset power trunk lid system Power trunk lid function -

    • Rear door ECU LH

    • Rear door ECU RH

    • Rear curtain

    		 Rear curtain position reset operation Rear door sunshade function -

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

    • Sliding roof housing

    • Sliding roof glass

    		 Initialize sliding roof system

    • Auto operation

    • Jam protection function

    • Sliding roof operation after power switch is turned OFF

    • Wireless door lock control function

    • Key-linked operation function

      (Driver's door only)

    • Entry lock switch-linked operation

    		 -