LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2012 >> HS 250h >> Repair and Diagnosis >> General Information >> Basic Trouble Shooting >> Introduction >> Repair Instruction >> Initialization >> Initialization
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Repair Instruction: Initialization: Initialization

  1. PROCEDURES NECESSARY WHEN BATTERY TERMINAL IS DISCONNECTED/RECONNECTED 
    NOTE:
    • After the power switch is turned off, the display and navigation module display (HDD navigation system) records various types of memory and settings. As a result, after turning the power switch off, make sure to wait at least 60 seconds before disconnecting the cable from the negative (-) battery terminal.
    • When the auxiliary battery is replaced or the cable is disconnected from its negative (-) battery terminal, the ISC learning value will be initialized and symptoms as a noise from the hybrid vehicle transaxle assembly may occur until ISC learning is performed.

      Therefore, perform ISC learning when the auxiliary battery is replaced or the cable is disconnected from the negative (-) terminal of the auxiliary battery. Refer to Loud Rattle from Hybrid Vehicle Transmission .

  2. PROCEDURES NECESSARY WHEN ECU OR OTHER PARTS ARE REPLACED 
    Replacement Part Necessary Procedure Effect / Inoperative Function when Necessary Procedures are not Performed See Test
    Hybrid vehicle control ECU Vehicle Identification Number (VIN) registration MIL comes on Refer to REGISTRATION
    Millimeter wave radar sensor assembly Adjust millimeter wave radar sensor assembly (Dynamic radar cruise control system)
    • Dynamic radar cruise control system
    • Pre-collision system
    Refer to ADJUSTMENT
    Lane recognition camera sensor assembly Adjust lane recognition camera sensor assembly (Lane keeping assist system)
    • Lane keeping assist system
    • Pre-collision system
    Refer to ADJUSTMENT
    • Tire pressure warning ECU
    • Tire pressure warning valve and transmitter
    1. Code registration
    2. Initialization
    • 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
    Refer to INITIALIZATION for initialization
    Refer to REGISTRATION for registration
    Brake booster with master cylinder (Skid control ECU, brake actuator or pressure sensor)
    1. Initialization and calibration of the linear solenoid valve
    2. Yaw rate and acceleration sensor zero point calibration
    • ABS warning light illumination
    • Slip indicator light illumination
    • Brake warning light / yellow (minor malfunction) illumination
    • VSC disabled or malfunctioning
    Refer to INITIALIZATION for initialization
    Refer to CALIBRATION for calibration
    • Brake pedal stroke sensor
    • Brake pedal
    1. Clearing stored linear solenoid valve calibration data
    2. Initialization and calibration of the linear solenoid valve
    • ABS warning light illumination
    • Slip indicator light illumination
    • Brake warning light / yellow (minor malfunction) illumination
    • VSC disabled or malfunctioning
    Yaw rate and acceleration sensor
    1. Clearing zero point calibration data
    2. Yaw rate and acceleration sensor zero point calibration
    • ABS warning light illumination
    • Slip indicator light illumination
    • Brake warning light / yellow (minor malfunction) illumination
    • VSC disabled or malfunctioning
    Power steering ECU
    1. Rotation angle sensor value initialization and torque sensor zero point calibration
    2. Assist map writing
    • P/S warning light comes on
    • EPS control
    Refer to CALIBRATION
    Steering column assembly Rotation angle sensor value initialization and torque sensor zero point calibration Steering effort is different between turning steering wheel to left and right
    Inner rear view mirror assembly* Re-registration of codes in the garage door opener system
    • Register transmitter code
    • Rolling code systems
    Garage door opener system Refer to REGISTRATION
    DCM (Telematics Transceiver) DCM activation Safety connect system Refer to DCM ACTIVATION
    • Certification ECU (smart key ECU assembly)
    • ID code box (immobiliser code ECU)
    • Transmission control ECU assembly
    • Key
    Code registration (Engine immobiliser system)
    • Wireless door lock control system
    • Smart access system with push-button start
    • Engine start
    Refer to REGISTRATION
    • Occupant classification ECU
    • Front passenger seat
    1. Zero point calibration (Occupant classification system)
    2. Sensitivity check (Occupant classification system)
    • Occupant classification system
    • Passenger airbag ON/OFF indicator
    • Airbag system (Front passenger side)
    • Seat belt warning system (Front passenger side)
    Refer to INITIALIZATION
    • Power window regulator motor
    • Door window regulator
    Initialize power window control system
    • Automatic door glass open/ close function
    • Jam protection function
    • Key-linked operation function
    • Wireless transmitter-linked operation function
    • Operation function after power switch is turned off
    Refer to INITIALIZATION
    • Sliding roof ECU (sliding roof drive gear sub-assembly)
    • Sliding roof glass
    • Sliding roof housing
    Initialize sliding roof ECU (pulse sensor initial position setting)
    • Automatic slide open/close and tilt up/down functions of sliding roof
    • Jam protection function
    • Operation function after power switch is turned off
    Refer to INITIALIZATION
    AFS ECU (headlight swivel ECU assembly) Perform AFS ECU (headlight swivel ECU assembly) initialization Automatic leveling function Refer to INITIALIZATION
    Rear height control sensor sub-assembly RH Perform AFS ECU (headlight swivel ECU assembly) initialization Automatic leveling function
    • *: w/ Garage Door Opener System