Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Initialization

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Vehicle Exterior / Lighting (ext) / Lighting System (w/ Automatic Headlight Beam Level Control System) / Initialization

INITIALIZATION

NOTICE:

  • The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during No. 1 headlight ECU sub-assembly LH removal/installation are shown below.

    Replaced Part or Performed Procedure

    Necessary Procedures

    Proceed to

    Replacement of the No. 1 headlight ECU sub-assembly LH

    Synchronize the vehicle information

    SYNCHRONIZE VEHICLE INFORMATION

    Perform No. 1 headlight ECU sub-assembly LH initialization

    NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH INITIALIZATION

    Replacement of the headlight assembly LH*1

    Synchronize the vehicle information

    SYNCHRONIZE VEHICLE INFORMATION

    Perform No. 1 headlight ECU sub-assembly LH initialization

    NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH INITIALIZATION

    Replacement of the rear height control sensor sub-assembly RH, removal and reinstallation of the rear height control sensor sub-assembly RH, replacement of the suspension, etc. have been performed

    Perform No. 1 headlight ECU sub-assembly LH initialization

    NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH INITIALIZATION

    Battery terminal is disconnected and connected

    Steering sensor zero point calibration

  • If the steering sensor zero point calibration is not performed, the AFS*2 and cornering lights*3 may not operate correctly.
  • A new No. 1 headlight ECU sub-assembly LH cannot operate until the vehicle information is registered.
  • A new headlight assembly LH cannot operate until the vehicle information is registered.*1
  • After replacing the No. 1 headlight ECU sub-assembly LH, it is necessary to perform vehicle information registration and initialization.
  • After replacing the headlight assembly LH, it is necessary to perform vehicle information registration and initialization.*1
  • Even if the No. 1 headlight ECU sub-assembly RH is replaced with a new one, synchronize the vehicle information and initialization are not necessary.
  • Even if the headlight assembly RH is replaced with a new one, synchronize the vehicle information and initialization are not necessary.*1
  • Adjust the headlight aim after initializing the No. 1 headlight ECU sub-assembly LH.*2

    Click here

  • When a malfunction is detected in the lighting system, rear height control sensor sub-assembly RH signal initialization is impossible. Perform troubleshooting before initialization.
  • The lighting system uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to the How to Proceed with Troubleshooting procedure.

    Click here

    • *1: for TMMC Made
    • *2: w/ AFS
    • *3: w/ Front Fog Light

SYNCHRONIZE VEHICLE INFORMATION (When using the TECHSTREAM)

NOTICE:

  • Make sure to synchronize the vehicle information before performing initialization.
  • If synchronization fails, make sure to turn the engine switch off then back on (IG) before performing synchronization again.

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Check that the "Headlight System Uninitialized Visit Your Dealer" warning message is displayed on the multi-information display.

(e) Enter the following menus: Body Electrical / AFS*1 or HL AutoLeveling*2 / Utility / ECU Information Sync.

  • *1: for Multiple Beam Headlight
  • *2: for Single Beam Headlight
Body Electrical > AFS > Utility

Tester Display

ECU Information Sync
Body Electrical > HL AutoLeveling > Utility

Tester Display

ECU Information Sync

(f) Check the display on the Techstream and press "Next".

(g) Check that the "Headlight System Malfunction Visit Your Dealer" warning message continuously blinks 6 times at 2 Hz on the multi-information display.

HINT:

  • If the "Headlight System Malfunction Visit Your Dealer" warning message does not start blinking on the multi-information display after perform the procedure again.
  • If the "Headlight System Malfunction Visit Your Dealer" warning message changes from blinking to displayed on the multi-information display, the rear height control sensor sub-assembly RH may be malfunctioning.

(h) Press "Exit".

(i) Turn the engine switch off.

NOTICE:

After synchronizing the vehicle information, initialize the No. 1 headlight ECU sub-assembly LH.

NOTICE:

  • Make sure to synchronize the vehicle information before performing initialization.
  • If synchronization fails, make sure to turn the engine switch off then back on (IG) before performing synchronization again.

SYNCHRONIZE VEHICLE INFORMATION (When not using the TECHSTREAM)

(a) Turn the engine switch on (IG).

(b) Check that the "Headlight System Uninitialized Visit Your Dealer" warning message is displayed on the multi-information display.

(c) Using the headlight dimmer switch, turn the low beam headlights on and off 8 times within 20 seconds after turning the engine switch on (IG).

NOTICE:

If the low beam headlights illuminate when the engine switch is on (IG), shine a light on the automatic light control sensor to turn the low beam headlights off before operating the headlight dimmer switch.

HINT:

If this step cannot be completed within 20 seconds, turn the engine switch off. Then, turn the engine switch on (IG) and restart the procedure.

(d) Check that the "Headlight System Malfunction Visit Your Dealer" warning message continuously blinks 6 times at 2 Hz on the multi-information display.

HINT:

  • If the "Headlight System Malfunction Visit Your Dealer" warning message does not start blinking on the multi-information display after perform the procedure again.
  • If the "Headlight System Malfunction Visit Your Dealer" warning message changes from blinking to displayed on the multi-information display, turn the engine switch off and then on (IG). If "Headlight System Malfunction Visit Your Dealer" is displayed immediately after the engine switch is turned on (IG), the rear height control sensor sub-assembly RH may be malfunctioning.

(e) Turn the engine switch off.

NOTICE:

After synchronizing the vehicle information, initialize the No. 1 headlight ECU sub-assembly LH.

NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH INITIALIZATION (When using the TECHSTREAM)

NOTICE:

Make sure to synchronize the vehicle information before performing initialization.

(a) Prepare vehicle for initialization (w/ DRL OFF Switch)

  • Unload the vehicle, ensuring that the spare tire, tools and jack are in their original positions.
  • Check that there are no occupants in the vehicle.
  • Turn the light control switch to the DRL OFF position.
  • Stop the vehicle on a level surface and keep the vehicle height unchanged.

(b) Prepare vehicle for initialization (w/o DRL OFF Switch)

  • Unload the vehicle, ensuring that the spare tire, tools and jack are in their original positions.
  • Check that there are no occupants in the vehicle.
  • Turn the light control switch to the AUTO position.*
  • Stop the vehicle on a level surface and keep the vehicle height unchanged.

HINT:

*: Turn off the headlights.

(c) Check the "Headlight System Malfunction Visit Your Dealer" warning message on the multi-information display.

(1) Turn the engine switch on (IG), and check the condition of the "Headlight System Malfunction Visit Your Dealer" warning message on the multi-information display.

OK:

Condition

Specified Condition

The No. 1 headlight ECU sub-assembly LH has been replaced with a new one.

"Headlight System Malfunction Visit Your Dealer" blinks 6 times at 2 Hz.

The headlight assembly LH has been replaced with a new one.*

Replacement of the rear height control sensor sub-assembly RH, removal and reinstallation of the rear height control sensor sub-assembly RH, replacement of the suspension, etc. have been performed.

"Headlight System Malfunction Visit Your Dealer" is not displayed.
  • *: for TMMC Made

HINT:

If the condition of the "Headlight System Malfunction Visit Your Dealer" warning message is different than listed in the table above, the No. 1 headlight ECU sub-assembly LH or combination meter assembly may be malfunctioning.

(d) Perform initialization.

(1) Turn the engine switch off.

(2) Connect the Techstream to the DLC3.

(3) Turn the engine switch on (IG).

(4) Enter the following menus: Body Electrical / AFS*1 or HL AutoLeveling*2 / Utility / Height Sensor Initialization.

  • *1: for Multiple Beam Headlight
  • *2: for Single Beam Headlight
Body Electrical > AFS > Utility

Tester Display

Height Sensor Initialization
Body Electrical > HL AutoLeveling > Utility

Tester Display

Height Sensor Initialization

(5) Check the display on the Techstream and press "Next".

(6) Check the proper "Position ID" by the fuel level according to the table below.

*a

Fuel Receiver Gauge (for TFT Meter Type)

*b

Fuel Receiver Gauge (for Optitron Meter Type)

HINT:

The "Position ID" is determined by the present fuel level as shown below.

Fuel Level

Position ID

Number of Times Headlight Leveling Warning Blinks

Within A range

EMPTY

1

Within B range

1/4 to over EMPTY

2

Within C range

1/2 to over 1/4

3

Within D range

3/4 to over 1/2

4

Within E range

FULL to over 3/4

5

(7) Select the proper "Position ID" and press "Next".

(8) Press "Exit".

(9) Check the condition of the "Headlight System Malfunction Visit Your Dealer" warning message on the multi-information display.

Standard:

Condition

Specified Condition

The No. 1 headlight ECU sub-assembly LH has been replaced with a new one.

Blinks 6 times at 2 Hz → Continuously blinks N*2 times at 2 Hz.

The headlight assembly LH has been replaced with a new one.*1

Replacement of the rear height control sensor sub-assembly RH, removal and reinstallation of the rear height control sensor sub-assembly RH, replacement of the suspension, etc. have been performed.

Off → Continuously blinks N*2 times at 2 Hz.
  • *1: for TMMC Made

HINT:

  • *2: The number of times that "Headlight System Malfunction Visit Your Dealer" warning message blinks is determined by the "Position ID" selected.
  • If the "Headlight System Malfunction Visit Your Dealer" warning message is displayed on the multi-information display, the No. 1 headlight ECU sub-assembly LH may be malfunctioning.
  • If initialization does not finish normally, restart the initialization procedure from step (i).

(10) Check that initialization finishes normally and turn the engine switch off.

HINT:

The warning message will blink in the pattern indicating that initialization has completed successfully continuously until the engine switch is turned off.

NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH INITIALIZATION (When not using the TECHSTREAM)

NOTICE:

Make sure to synchronize the vehicle information before performing initialization.

(a) Prepare vehicle for initialization (w/ DRL OFF Switch)

  • Unload the vehicle, ensuring that the spare tire, tools and jack are in their original positions.
  • Check that there are no occupants in the vehicle.
  • Turn the light control switch to the DRL OFF position.
  • Stop the vehicle on a level surface and keep the vehicle height unchanged.

(b) Prepare vehicle for initialization (w/o DRL OFF Switch)

  • Unload the vehicle, ensuring that the spare tire, tools and jack are in their original positions.
  • Check that there are no occupants in the vehicle.
  • Turn the light control switch to the AUTO position.*
  • Stop the vehicle on a level surface and keep the vehicle height unchanged.

HINT:

*: Turn off the headlights.

(c) Check the "Headlight System Malfunction Visit Your Dealer" warning message on the multi-information display.

(1) Turn the engine switch on (IG), and check the condition of the "Headlight System Malfunction Visit Your Dealer" warning message on the multi-information display.

OK:

Condition

Specified Condition

The No. 1 headlight ECU sub-assembly LH has been replaced with a new one.

"Headlight System Malfunction Visit Your Dealer" blinks 6 times at 2 Hz.

The headlight assembly LH has been replaced with a new one.*

Replacement of the rear height control sensor sub-assembly RH, removal and reinstallation of the rear height control sensor sub-assembly RH, replacement of the suspension, etc. have been performed.

"Headlight System Malfunction Visit Your Dealer" is not displayed.
  • *: for TMMC Made

HINT:

If the condition of the "Headlight System Malfunction Visit Your Dealer" warning message is different than listed in the table above, the No. 1 headlight ECU sub-assembly LH or combination meter assembly may be malfunctioning.

(d) Perform initialization. (w/ DRL OFF Switch)

(1) Turn the engine switch on (IG) and light control switch DRL OFF.

(2) Check the specified number of times to turn the low beam headlights on and off.

*a

Fuel Receiver Gauge (for TFT Meter Type)

*b

Fuel Receiver Gauge (for Optitron Meter Type)

HINT:

The number of times the low beam headlights need to be turned on and off is determined by the present fuel level as shown below.

Fuel Level

Number of Times to Turn Low Beam Headlights On and Off

Within A range

1

Within B range

2

Within C range

3

Within D range

4

Within E range

5

(3) Enter initialization mode.

  1. Turn the engine switch and light control switch DRL OFF.
  2. Cover the automatic light control sensor with a lightproof object.
  3. Perform the following steps within 5 seconds.
    1. Press the engine switch 2 times.

      HINT:

      Turn the engine switch on (IG).

    2. While pulling the headlight dimmer switch, turn it from DRL OFF to AUTO to DRL OFF again 3 times or more.

      HINT:

      Check that the parking lights turn from off to on and back off again.

    3. Turn the light control switch DRL OFF.

HINT:

  • Perform the above operation within 5 seconds.
  • When initialization mode has been entered, "Headlight System Malfunction Visit Your Dealer" warning message on the multi-information display starts blinking at 1 Hz.

(4) After entering initialization mode, turn the low beam headlights from off to on and back off again N* times.

HINT:

  • *: The number of times to turn the light control switch on and DRL OFF (N) is determined by the fuel level of the fuel receiver gauge.
  • Turn the light control switch on and DRL OFF within 20 seconds of entering initialization mode.
  • Turn the light control switch on and DRL OFF at intervals of approximately 3 seconds.

(e) Perform initialization. (w/o DRL OFF Switch)

(1) Turn the engine switch on (IG).

(2) Check the specified number of times to turn the low beam headlights on and off.

*a

Fuel Receiver Gauge (for TFT Meter Type)

*b

Fuel Receiver Gauge (for Optitron Meter Type)

HINT:

The number of times the low beam headlights need to be turned on and off is determined by the present fuel level as shown below.

Fuel Level

Number of Times to Turn Low Beam Headlights On and Off

Within A range

1

Within B range

2

Within C range

3

Within D range

4

Within E range

5

(3) Enter initialization mode.

  1. Turn the engine switch and light control switch AUTO.

    HINT:

    *: Turn off the headlights.

  2. Shine a light on the automatic light control sensor.
  3. Perform the following steps within 5 seconds.
    1. Press the engine switch 2 times.

      HINT:

      Turn the engine switch on (IG).

    2. While pulling the headlight dimmer switch, turn it from AUTO to tail to AUTO again 3 times or more.

      HINT:

      Check that the parking lights turn from off to on and back off again.

    3. Turn the light control switch AUTO.

HINT:

  • Perform the above operation within 5 seconds.
  • When initialization mode has been entered, "Headlight System Malfunction Visit Your Dealer" warning message on the multi-information display starts blinking at 1 Hz.

(4) After entering initialization mode, turn the low beam headlights from off to on and back off again N* times.

HINT:

  • *: The number of times to turn the light control switch on and AUTO (N) is determined by the fuel level of the fuel receiver gauge.
  • Turn the light control switch on and AUTO within 20 seconds of entering initialization mode.
  • Turn the light control switch on and AUTO at intervals of approximately 3 seconds.

(f) Check the condition of the "Headlight System Malfunction Visit Your Dealer" warning message on the multi-information display.

Standard:

Condition

Specified Condition

The No. 1 headlight ECU sub-assembly LH has been replaced with a new one.

Blinks 6 times at 2 Hz → Continuously blinks N*2 times at 2 Hz.

The headlight assembly LH has been replaced with a new one.*1

Replacement of the rear height control sensor sub-assembly RH, removal and reinstallation of the rear height control sensor sub-assembly RH, replacement of the suspension, etc. have been performed.

Off → Continuously blinks N*2 times at 2 Hz.
  • *1: for TMMC Made

HINT:

  • *2: The number of times that "Headlight System Malfunction Visit Your Dealer" warning message blinks is determined by the number of times the low beam headlights are turned on and off.
  • If the "Headlight System Malfunction Visit Your Dealer" warning message is displayed on the multi-information display, the No. 1 headlight ECU sub-assembly LH may be malfunctioning.
  • If initialization does not finish normally, restart the initialization procedure from step (i).

(g) Check that initialization finishes normally and turn the engine switch off.

HINT:

The warning message will blink in the pattern indicating that initialization has completed successfully continuously until the engine switch is turned off.

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