Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Automatic High Beam System does not Operate or Operation Indicator does not Illuminate

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Vehicle Exterior / Lighting (ext) / Lighting System (w/o Automatic Headlight Beam Level Control System) / Automatic High Beam System does not Operate or Operation Indicator does not Illuminate

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the automatic high beam system based on signals received from the forward recognition camera.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

    Click here

  • When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.
  • If the forward recognition camera has been replaced with a new one, be sure to perform Forward Recognition Camera Learning.

    Click here

  • Before performing troubleshooting, check that the low beam headlights and high beam headlights illuminate correctly.
  • When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.
  • If the forward recognition camera cannot operate due to high vehicle interior temperatures, bad weather (rain, fog, etc.) or fogged up or dirty glass, the automatic high beam system will not operate and the automatic high beam indicator will not illuminate.
  • Before performing troubleshooting, check that the front radar sensor system operates correctly.

    Click here

PROCEDURE

1.

READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Chassis / Front Recognition Camera / Data List.

(e) Read the Data List according to the display on the Techstream.

Chassis > Front Recognition Camera > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Front Recognition Camera High Temperature 2

Forward recognition camera condition

Not High Temperature or High Temperature

Not High Temperature: 65°C (149°F) or lower

High Temperature: 65°C (149°F) or higher

When "High Temperature" is displayed, the automatic high beam system is temporarily suspended.

Chassis > Front Recognition Camera > Data List

Tester Display

Front Recognition Camera High Temperature 2

OK:

"Not High Temperature" is displayed on the Techstream.

HINT:

If "High Temperature" is displayed, move the vehicle to a cool place and allow the temperature of the forward recognition camera to decrease before continuing with troubleshooting.

NG

END (TEMPORARY SUSPENSION OF AUTOMATIC HIGH BEAM SYSTEM DUE TO HIGH FORWARD RECOGNITION CAMERA TEMPERATURE)

OK

2.

CHECK AUTOMATIC HIGH BEAM INDICATOR LIGHT

(a) Check the operation of the automatic high beam indicator light.

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

(2) Turn the light control switch to the AUTO or head position.

(3) Cover the automatic light control sensor to turn the low beam headlights on.

(4) Move the dimmer switch to the low position.

(5) Press the automatic high beam switch.

OK:

Automatic high beam indicator light illuminate.

NG

GO TO STEP 5

OK

3.

READ VALUE USING TECHSTREAM

*1

Forward Recognition Camera

(Automatic High Beam Sensor)

*2

Work Light or Equivalent

*a

100 mm or less

(a) Shine a light on the automatic high beam sensor.

HINT:

If troubleshooting is being performed in a bright area, such as outside on a sunny day, it will not be necessary to perform this step.

(b) Connect the Techstream to the DLC3.

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

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Main Body / Data List.

(f) Read the Data List according to the display on the Techstream.

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Auto H Beam STS0

Automatic high beam sensor current state

Undetec, CAM NA, No sens, Hlight, Taillgt, Speed, Daytime, Village, Malfunc, Delay, Aim Lmt, SAE Mod, Undefin or LIN Err

Condition can be displayed

-

Body Electrical > Main Body > Data List

Tester Display

Auto H Beam STS0

OK:

"Daytime" is displayed on the Techstream.

NG

REPLACE FORWARD RECOGNITION CAMERA

OK

4.

READ VALUE USING TECHSTREAM

*1

Cardboard or Equivalent Object

*a

150 mm or more

*b

3 mm or more

(a) Cover the automatic high beam sensor with an opaque object, such as cardboard.

NOTICE:

  • Make sure that there is no clearance between the cardboard or equivalent object and the area of the windshield glass in front of the automatic high beam sensor.
  • If there is any clearance, light may shine on the automatic high beam sensor and the value of the Data List will not change.

(b) Connect the Techstream to the DLC3.

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

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Main Body / Data List.

(f) Read the Data List according to the display on the Techstream.

HINT:

As it may take time for the values in the Data List to change, wait at least 10 seconds before reading the Data List.

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Auto H Beam STS0

Automatic high beam sensor current state

Undetec, CAM NA, No sens, Hlight, Taillgt, Speed, Daytime, Village, Malfunc, Delay, Aim Lmt, SAE Mod, Undefin or LIN Err

Condition can be displayed

-

Body Electrical > Main Body > Data List

Tester Display

Auto H Beam STS0

OK:

"Speed" is displayed on the Techstream.

OK

USE SIMULATION METHOD TO CHECK

NG

REPLACE FORWARD RECOGNITION CAMERA

5.

READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Main Body / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Auto High Beam Main Switch

Automatic high beam switch signal

OFF or ON

OFF: Automatic high beam switch not pressed

ON: Automatic high beam switch pressed

-

Body Electrical > Main Body > Data List

Tester Display

Auto High Beam Main Switch

OK:

Normal conditions listed above are displayed.

NG

GO TO STEP 8

OK

6.

READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Main Body / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Auto H Beam STS0

Automatic high beam sensor current state

Undetec, CAM NA, No sens, Hlight, Taillgt, Speed, Daytime, Village, Malfunc, Delay, Aim Lmt, SAE Mod, Undefin or LIN Err

Condition can be displayed

-

Body Electrical > Main Body > Data List

Tester Display

Auto H Beam STS0

OK:

"Daytime" or "Speed" is displayed on the Techstream.

NG

REPLACE FORWARD RECOGNITION CAMERA

OK

7.

PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Combination Meter / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Body Electrical > Combination Meter > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Automatic High Beam Indicator

Automatic high beam indicator light

OFF or ON

-

Body Electrical > Combination Meter > Active Test

Tester Display

Automatic High Beam Indicator

OK:

The automatic high beam indicator light illuminates and turns off.

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE COMBINATION METER ASSEMBLY

8.

INSPECT AUTOMATIC HIGH BEAM SWITCH (INTEGRATION CONTROL AND PANEL ASSEMBLY)

(a) Remove the automatic high beam switch (integration control and panel assembly).

Click here

(b) Inspect the automatic high beam switch (integration control and panel assembly).

Click here

NG

REPLACE AUTOMATIC HIGH BEAM SWITCH (INTEGRATION CONTROL AND PANEL ASSEMBLY)

OK

9.

CHECK HARNESS AND CONNECTOR (INTEGRATION CONTROL AND PANEL ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND BODY GROUND)

(a) Disconnect the J9 main body ECU (multiplex network body ECU) connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

J83-1 (+B) - J9-23 (AHBI)

Always

Below 1 Ω

J83-1 (+B) or J9-23 (AHBI) - Body ground

Always

10 kΩ or higher

J83-10 (E) - Body ground

Always

Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

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