Lexus ES: Initialization

NOTICE:

• The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during headlight ECU sub-assembly LH removal/installation are shown below. for LED Type Turn Signal Light

  Replaced Part or Performed Procedure	Necessary Procedures	Proceed to
  Replacement of the headlight ECU sub-assembly LH	Synchronize the vehicle information	SYNCHRONIZE VEHICLE INFORMATION
  	Perform headlight ECU sub-assembly LH initialization	HEADLIGHT ECU SUB-ASSEMBLY LH INITIALIZATION
  Replacement of the rear height control sensor sub-assembly LH, removal and reinstallation of the rear height control sensor sub-assembly LH, replacement of the suspension, etc. have been performed	Perform headlight ECU sub-assembly LH initialization	HEADLIGHT ECU SUB-ASSEMBLY LH INITIALIZATION
  Battery terminal is disconnected and connected	Steering sensor zero point calibration

  for Bulb Type Turn Signal Light

  Replaced Part or Performed Procedure	Necessary Procedures	Proceed to
  Replacement of the headlight ECU sub-assembly LH or headlight assembly LH*	Synchronize the vehicle information	SYNCHRONIZE VEHICLE INFORMATION
  Battery terminal is disconnected and connected	Steering sensor zero point calibration

  • *: for TMMK Made
• If the steering sensor zero point calibration is not performed, the AFS may not operate correctly.*1
• If the steering sensor zero point calibration is not performed, the cornering lights may not operate correctly.
• A new headlight ECU sub-assembly LH cannot operate until the vehicle information is registered.
• After replacing the headlight ECU sub-assembly LH, it is necessary to perform vehicle information registration and initialization.*1
• Even if the headlight ECU sub-assembly RH is replaced with a new one, synchronize the vehicle information and initialization are not necessary.*1
• Even if the headlight ECU sub-assembly RH is replaced with a new one, it is not necessary to synchronize the vehicle information.*2
• Adjust the headlight aim after initializing the headlight ECU sub-assembly LH.*1

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• When a malfunction is detected in the lighting system, rear height control sensor sub-assembly LH signal initialization is impossible. Perform troubleshooting before initialization.*1
• 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.

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  • *1: for LED Type Turn Signal Light
  • *2: for Bulb Type Turn Signal 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 LED Type Turn Signal Light
• *2: for Bulb Type Turn Signal Light

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 LH 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 LH 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*1 or off*2 position.
• Stop the vehicle on a level surface and keep the vehicle height unchanged.
  • *1: w/ DRL OFF Switch
  • *2: w/o DRL OFF Switch

• *1: for LED Type Turn Signal Light
• *2: for Bulb Type Turn Signal Light

HINT:

• If the "Headlight System Malfunction Visit Your Dealer" warning message is displayed on the multi-information display, the 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*1 or off*2 position.
• Stop the vehicle on a level surface and keep the vehicle height unchanged.
  • *1: w/ DRL OFF Switch
  • *2: w/o DRL OFF Switch

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*1 or off*2 to AUTO to DRL OFF*1 or off*2 again 3 times or more.

   HINT:

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

   • *1: w/ DRL OFF Switch
   • *2: w/o DRL OFF Switch
3. Turn the light control switch 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:

• If the "Headlight System Malfunction Visit Your Dealer" warning message is displayed on the multi-information display, the headlight ECU sub-assembly LH may be malfunctioning.
• If initialization does not finish normally, restart the initialization procedure from step (i).

 Problem Symptoms Table

 Terminals Of Ecu

 Dtc Check / Clear

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