Lexus NX: Initialization

Lexus NX Service Manual / Vehicle Exterior / Lighting (ext) / Automatic Headlight Beam Level Control System (for Triple Beam Headlight) / Initialization

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.

Performed Work or System Condition	Necessary Procedures	Proceed to
Replacement of the headlight ECU sub-assembly LH	Synchronize the vehicle information	SYNCHRONIZE VEHICLE INFORMATION
Replacement of the headlight ECU sub-assembly LH	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
Auxiliary battery terminal is disconnected and connected.	Steering Sensor Zero Point Calibration

If the steering sensor zero point calibration is not performed, the AFS (adaptive front-lighting system) and cornering lights may not operate correctly.
A new headlight ECU sub-assembly LH cannot operate until the synchronize the vehicle information.
After replacing the headlight ECU sub-assembly LH, it is necessary to perform synchronize the vehicle information and initialization.
Even if the headlight ECU sub-assembly RH is replaced with a new one, synchronize the vehicle information and initialization are not necessary.
Adjust the headlight aim after initializing the headlight ECU sub-assembly LH.
When a malfunction is detected in the automatic headlight beam level control system, rear height control sensor sub-assembly LH signal initialization is impossible. Perform troubleshooting before initialization.

SYNCHRONIZE VEHICLE INFORMATION (When using Techstream)

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch on (IG) and check that "Headlight Auto Leveling System Unavailable Visit Your Dealer" warning message is displayed on the multi-information display.

(d) Enter the following menus: Body Electrical / AFS / Utility / ECU Information Sync.

Body Electrical > AFS > Utility

Tester Display
ECU Information Sync

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

(f) Check that the "Headlight Auto Leveling System Unavailable Visit Your Dealer" on the multi-information display continuously blink 6 times at 2 Hz.

(g) Press "Exit" and turn the power switch off.

NOTICE:

After synchronizing the vehicle information, initialize the headlight ECU sub-assembly LH.

HINT:

If the "Headlight Auto Leveling System Unavailable Visit Your Dealer" warning message on the multi-information display does not start blinking after performing step (v), perform the procedure again.
If the "Headlight Auto Leveling System Unavailable Visit Your Dealer" warning message on the multi-information display changes from blinking to illuminated, the headlight ECU sub-assembly LH or rear height control sensor sub-assembly LH may be malfunctioning.

SYNCHRONIZE VEHICLE INFORMATION (When not using Techstream)

(a) Turn the power switch on (IG) and check that "Headlight Auto Leveling System Unavailable Visit Your Dealer" warning message is displayed on the multi-information display.

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

NOTICE:

If the low beam headlights illuminate when the power 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. (w/o DRL OFF Switch)
Turn the low beam headlights on and off at intervals of less than 2 seconds.

HINT:

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

(c) Check that the "Headlight Auto Leveling System Unavailable Visit Your Dealer" on the multi-information display continuously blink 6 times at 2 Hz.

HINT:

If the "Headlight Auto Leveling System Unavailable Visit Your Dealer" warning message on the multi-information display does not start blinking after performing step (ii), perform the procedure again.
If the "Headlight Auto Leveling System Unavailable Visit Your Dealer" warning message on the multi-information display changes from blinking to illuminated, turn the power switch off and then on (IG). If the "Headlight Auto Leveling System Unavailable Visit Your Dealer" warning message is displayed immediately after the power switch is turned on (IG), the headlight ECU sub-assembly LH may be malfunctioning.
If the "Headlight Auto Leveling System Unavailable Visit Your Dealer" warning message on the multi-information display changes from blinking to illuminated, turn the power switch off and then on (IG). If the "Headlight Auto Leveling System Unavailable Visit Your Dealer" warning message is displayed 5 seconds or more after the power switch was turned on (IG), the rear height control sensor sub-assembly LH may be malfunctioning.

(d) Turn the power switch off.

NOTICE:

After synchronizing the vehicle information, initialize the headlight ECU sub-assembly LH.

HEADLIGHT ECU SUB-ASSEMBLY LH INITIALIZATION (When using Techstream)

(a) Prepare vehicle for initialization

(1) Unload the trunk and vehicle, ensuring that the spare tire, tools and jack are in their original positions.

(2) Check that there are no occupants in the vehicle.

(3) Turn off the headlights.

(4) Stop the vehicle on a level surface and keep the vehicle height unchanged.

(b) Check the "Headlight Auto Leveling System Unavailable Visit Your Dealer" on the multi-information display.

(1) Turn the power switch on (IG), and check the condition of the "Headlight Auto Leveling System Unavailable Visit Your Dealer" on the multi-information display.

OK:

Condition	Specified Condition
The headlight ECU sub-assembly LH has been replaced with a new one.	"Headlight Auto Leveling System Unavailable Visit Your Dealer" on the multi-information display continuously blink 6 times at 2 Hz.
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.	"Headlight Auto Leveling System Unavailable Visit Your Dealer" is not displayed on the multi-information display.

(1) Turn the power switch off.

(2) Connect the Techstream to the DLC3.

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

(4) Enter the following menus: Body Electrical / AFS / Utility / Height Sensor Initialization.

Body Electrical > AFS > 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.

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 Auto Leveling System Unavailable Visit Your Dealer" on the multi-information display.

Standard:

Condition	Specified Condition
The headlight ECU sub-assembly LH has been replaced with a new one.	Blink 6 times at 2 Hz → Continuously blink N* times at 2 Hz.
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.	Off → Continuously blink N* times at 2 Hz.

HINT:

*: The number of times that the "Headlight Auto Leveling System Unavailable Visit Your Dealer" on the multi-information display blink is determined by the "Position ID" selected.
If initialization does not finish normally, restart the initialization procedure from step (i).
If the "Headlight Auto Leveling System Unavailable Visit Your Dealer" warning message is displayed on the multi-information display, the headlight ECU sub-assembly LH may be malfunctioning.

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

HEADLIGHT ECU SUB-ASSEMBLY LH INITIALIZATION (When not using Techstream)

(a) Prepare vehicle for initialization

(1) Unload the trunk and vehicle, ensuring that the spare tire, tools and jack are in their original positions.

(2) Check that there are no occupants in the vehicle.

(3) Turn off the headlights.

(4) Stop the vehicle on a level surface and keep the vehicle height unchanged.

(b) Check the "Headlight Auto Leveling System Unavailable Visit Your Dealer" on the multi-information display.

(1) Turn the power switch on (IG), and check the condition of the "Headlight Auto Leveling System Unavailable Visit Your Dealer" on the multi-information display.

OK:

Condition	Specified Condition
The headlight ECU sub-assembly LH has been replaced with a new one.	"Headlight Auto Leveling System Unavailable Visit Your Dealer" on the multi-information display continuously blink 6 times at 2 Hz.
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.	"Headlight Auto Leveling System Unavailable Visit Your Dealer" is not displayed on the multi-information display.

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

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

*a	Fuel Receiver Gauge

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.

Turn the power switch and light control switch AUTO.
Turn the light control switch to the AUTO position.*
HINT:

*: Turn off the headlights.
Shine a light on the automatic light control sensor.
Perform the following steps within 5 seconds.
1. Press the power switch 2 times.
  HINT:
  
  Turn the power 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 to the AUTO position.*
  HINT:
  
  *: Turn off the headlights.

HINT:

Perform the above operation within 5 seconds.
When initialization mode has been entered, "Headlight Auto Leveling System Unavailable Visit Your Dealer" 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 headlight dimmer switch assembly on and off (N) is determined by the fuel level of the fuel receiver gauge.
Turn the headlight dimmer switch on and off within 20 seconds of entering initialization mode.
Turn the headlight dimmer switch on and off at intervals of approx. 3 seconds.

(5) Check the condition of the "Headlight Auto Leveling System Unavailable Visit Your Dealer" on the multi-information display.

Standard:

Condition	Specified Condition
The headlight ECU sub-assembly LH has been replaced with a new one.	Blink 6 times at 2 Hz → Continuously blink N* times at 2 Hz.
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.	Off → Continuously blink N* times at 2 Hz.

HINT:

*: The number of times that the "Headlight Auto Leveling System Unavailable Visit Your Dealer" on the multi-information display blink is determined by the number of times the low beam headlights are turned on and off.
If initialization does not finish normally, restart the initialization procedure from step (i).
If the "Headlight Auto Leveling System Unavailable Visit Your Dealer" warning message is displayed on the multi-information display, the headlight ECU sub-assembly LH may be malfunctioning.

(6) Check that initialization finishes normally and turn the power switch off.

SEE MORE:

Inspection

INSPECTION PROCEDURE 1. INSPECT REAR DOOR OUTSIDE HANDLE ASSEMBLY LH (a) Check that the LED illuminates. (1) Apply 6.0 V (4 dry cell batteries in series) to each terminal and check the illumination state of the light. OK: Measurement Condition Specified Condition Battery positive (+) �

Precaution

PRECAUTION CAUTION: This vehicle is equipped with a Supplemental Restraint System (SRS), which consists of a horn button assembly, instrument panel passenger airbag assembly, curtain shield airbag assembly, front seat airbag assembly, lower No. 1 instrument panel airbag assembly, front seat outer

Lexus NX: Initialization

READ NEXT:

Problem Symptoms Table

Terminals Of Ecu

Diagnosis System

SEE MORE:

Inspection

Precaution