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

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• 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

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.

• *1: for Multiple Beam Headlight
• *2: for Single Beam Headlight

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.

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.

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.

• 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.

• 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.

• *: for TMMC Made

• *1: for Multiple Beam Headlight
• *2: for Single Beam Headlight

• *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).

• 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.

• 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.

• *: for TMMC Made

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.

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.

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.

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.

• *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).

Customize Parameters

Problem Symptoms Table

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