Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Initialization

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / General / Introduction / Repair Instruction / Initialization

INITIALIZATION

PROCEDURES NECESSARY WHEN BATTERY TERMINAL IS DISCONNECTED/RECONNECTED

Necessary Procedures

Effect/Inoperative Function When Necessary Procedures are not Performed

Link
*1: When performing learning using the Techstream.

Click here

Memorize steering angle neutral point

Lane Control System

Pre-collision System

Intelligent Clearance Sonar System*1

Parking Assist Monitor System

Panoramic View Monitor System

Lighting System (w/ Automatic Headlight Beam Level Control System)

Initialize back door lock

Power Door Lock Control System

Reset back door close position

Power Back Door System (w/ Outside Door Control Switch)

NOTICE:

After the engine switch is turned off, the radio receiver assembly records various types of memory and settings. As a result, after turning the engine switch off, make sure to wait at least 120 seconds before disconnecting the cable from the negative (-) battery terminal.

PROCEDURES NECESSARY WHEN ECU OR OTHER PARTS ARE REPLACED

Replacement Part

Necessary Procedure

Effect/Inoperative Function when Necessary Procedures are not Performed

Link
*1: w/ Optitron Meter Type

*2: w/ TFT Meter Type

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

*4: When the 4WD ECU assembly is replaced with a new one, calibration is unnecessary.

*5: w/ Rear Air Conditioning System

*6: for TMMC Made with Automatic Headlight Beam Level Control System

ECM

Vehicle Identification Number (VIN) registration

MIL comes on

ECU communication ID registration (Immobiliser system)

Engine start function

  • 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 (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
  • Engine coolant temperature sensor
  • Spark plug
  • Ignition coil assembly
  • Air intake system parts
  • Exhaust system parts
  • 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
  • Lane Control System
  • Road Sign Assist System
  • Front Radar Sensor System
  • Pre-collision System
  • Lighting System (w/ Automatic Headlight Beam Level Control System)
  • Lighting System (w/o Automatic Headlight Beam Level Control System)

  • Forward recognition camera
  • Windshield glass

Adjust forward recognition camera
  • Dynamic Radar Cruise Control System
  • Front Camera System
  • Lane Control System
  • Road Sign Assist System
  • Pre-collision System
  • Lighting System (w/ Automatic Headlight Beam Level Control System)
  • Lighting System (w/o Automatic Headlight Beam Level Control System)

for One time recognition

or

for Sequential recognition

Automatic transaxle assembly

Perform the following procedures in the order shown:

  1. Input transaxle compensation code into ECM
  2. Perform road test to allow ECM to learn
  • Large shift shock
  • Deterioration of fuel efficiency

for U881E Initialization

for U881E Registration

for U881F Initialization

for U881F Registration
  • Valve body assembly
  • Shift solenoid valve SL3, SL4 and/or SL5

Perform the following procedures in the order shown:

  1. Reset transaxle compensation code
  2. Perform road test to allow ECM to learn

Shift solenoid valve SL1 and/or SL2

Perform road test to allow ECM to learn

ECM

(If possible, read the transaxle compensation code from the previous ECM)

Perform the following procedures in the order shown:

  1. Transfer transaxle compensation code
  2. Perform road test to allow ECM to learn

ECM

(If impossible, read the transaxle compensation code from the previous ECM)

Perform the following procedures in the order shown:

  1. Reset transaxle compensation code
  2. Perform road test to allow ECM to learn

4WD ECU assembly*4

Clear zero point calibration data

Dynamic Torque Control AWD System

  • Acceleration sensor (airbag sensor assembly)*1
  • Acceleration sensor (yaw rate sensor assembly)*2
  • Clear zero point calibration data
  • Perform yaw rate and acceleration sensor zero point calibration

Absorber Control ECU

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)
  • 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

for Registration

for Initialization

Skid control ECU (brake actuator assembly)

Operate the electric parking brake switch assembly

Parking brake indicator light (red) blinks when the engine switch is first turned on (IG)

Skid control ECU (brake actuator assembly)

Calibration
  • VSC disabled or malfunctioning
  • DTCs are output
  • Slip indicator light illuminated
  • ABS warning light illuminated

  • Yaw rate and acceleration sensor (airbag sensor assembly)*1
  • Yaw rate and acceleration sensor*2

Calibration

Power steering ECU assembly
  • Perform 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

Perform torque sensor zero point calibration

DCM (telematics transceiver)

DCM activation

Safety connect system

Perform code registration (Immobiliser system)

Telematics System

BUB (Back-up battery)

Perform backup battery replacement reset

Safety connect system

Steering sensor

Steering angle neutral point (Initialize intelligent clearance sonar system)
  • Intelligent Clearance Sonar System
  • Intuitive Parking Assist System (w/ Intelligent Clearance Sonar System)

  • Suspension, tires, etc.*3
  • Front bumper assembly
  • Rear bumper assembly
  • Ultrasonic sensor
  • Ultrasonic sensor detection angle
  • Ultrasonic sensor detection angle registration

Clearance warning ECU assembly
  • Ultrasonic sensor detection angle
  • Steering angle neutral point
  • Registration of bumper type
  • Ultrasonic sensor detection angle registration

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

Parking Assist Monitor System

for Initialization

for Calibration

Suspension, tires, etc.*3

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

Rear television camera assembly
  • Parking assist monitor system initialization
  • Rear television camera assembly optical axis (Back camera position setting)

Steering sensor

Steering angle neutral point (Initialize panoramic view monitor system)

Panoramic View Monitor System

for Initialization

for Calibration

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, front bumper assembly or radiator grille
  • 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.*3
  • Parking assist ECU initialization
  • Adjust steering angle

Blind spot monitor sensor

Blind Spot Monitor Beam Axis Adjustment
  • Intelligent Clearance Sonar System
  • Blind Spot Monitor System

  • 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

  • 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
  • ECM
  • Main body ECU (multiplex network body ECU)
  • DCM (telematics transceiver)

Perform code registration (Immobiliser system)
  • Wireless Door Lock Control System
  • Smart Access System with Push-button Start
  • Engine start function
  • Steering Lock System
  • Telematics System

  • Occupant detection ECU
  • Front passenger seat

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 LH
  • Front seatback frame sub-assembly LH
  • Front seat adjuster assembly LH

Initialize position control ECU

Front Power Seat Control System (w/ Memory)

for Rear Power Seat Control System (for Second Row)
  • 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 (for Second Row)

for Rear Power Seat Control System (for Third Row)
  • Fold seat control ECU (LH seat)
  • Fold seat control ECU (RH seat)
  • No. 2 seatback frame sub-assembly LH
  • No. 2 seatback frame sub-assembly RH
  • No. 2 seat cushion frame sub-assembly LH
  • No. 2 seat cushion frame sub-assembly RH

Initial position memorization

Rear power seat function (for Third Row)

  • Air conditioning amplifier assembly
  • No. 1 air conditioning radiator damper servo sub-assembly
  • No. 1 blower damper servo sub-assembly
  • No. 2 air conditioning radiator damper servo sub-assembly
  • No. 3 air conditioning radiator damper servo sub-assembly
  • Rear No. 1 cooling unit damper servo sub-assembly*5
  • Rear No. 2 cooling unit damper servo sub-assembly*5

Initialization servo motor (Air conditioning system)

DTCs are output

  • 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 assembly)
  • 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

Reset Back Door Close Position

Power Back Door System (w/ Outside Door Control Switch)

  • No. 1 headlight ECU sub-assembly LH
  • Headlight assembly LH*6
  • Synchronize vehicle information
  • Initialize No. 1 headlight ECU sub-assembly LH

Lighting System (w/ Automatic Headlight Beam Level Control System)

Rear height control sensor sub-assembly RH

Initialize No. 1 headlight ECU sub-assembly LH

Suspension, tires, etc.*3
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