Toyota Yaris: Lighting System / Automatic High Beam System does not Operate or Operation Indicator does not Illuminate

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Vehicle Exterior / Lighting (ext) / Lighting 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.
    • Sequential recognition: Click here
    • One time recognition: Click here

      Driving Adjustment: 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 GTS

(a) Read the Data List according to the display on the GTS.

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

If this item is "High Temperature", the automatic high beam system will be temporarily unavailable. If this does not improve even if the inside of the vehicle is left cooled for at least 10 minutes, the forward recognition camera may be malfunctioning.

HINT:

In summertime, the windshield glass may reach 100°C (212°F) or higher

Chassis > Front Recognition Camera > Data List

Tester Display

Front Recognition Camera High Temperature 2

OK:

"Not High Temperature" is displayed on the GTS.

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 (THE SYSTEM STOPPED OPERATING DUE TO HIGH TEMPERATURES)

OK

2.

CHECK AUTOMATIC HIGH BEAM INDICATOR LIGHT

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

(1) Turn the ignition switch to ON.

(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 auto high beam switch.

Result

Proceed to

OK (The automatic high beam indicator light and the auto high beam switch indicator illuminate)

A

NG (Automatic high beam indicator light does not illuminate)

B

NG (Auto high beam switch indicator does not illuminate)

C

NG (Automatic high beam indicator light and auto high beam switch indicator do not operate)

D

B

GO TO STEP 5

C

GO TO OTHER PROBLEM (Proceed to Automatic High Beam Switch Indicator does not Come ON)

D

GO TO STEP 6

A

3.

READ VALUE USING GTS

*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 (forward recognition camera).

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

(c) Read the Data List according to the display on the GTS.

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

Automatic High Beam Headlights Sensor Detection Status

Automatic high beam sensor state past 1

Undetected, N/A, No sens, Headlight, Taillight, Speed, Daytime, Village, Other sens, Change, Out of aim, SAE Mod, Aim adjust or LIN Err

Condition can be displayed

-

Body Electrical > Main Body > Data List

Tester Display

Automatic High Beam Headlights Sensor Detection Status

OK:

"Daytime" is displayed on the GTS.

NG

REPLACE FORWARD RECOGNITION CAMERA

OK

4.

READ VALUE USING GTS

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

(c) Read the Data List according to the display on the GTS.

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

Automatic High Beam Headlights Sensor Detection Status

Automatic high beam sensor current state

Undetected, N/A, No sens, Headlight, Taillight, Speed, Daytime, Village, Other sens, Change, Out of aim, SAE Mod, Aim adjust or LIN Err

Condition can be displayed

-

Body Electrical > Main Body > Data List

Tester Display

Automatic High Beam Headlights Sensor Detection Status

OK:

"Speed" is displayed on the GTS.

OK

USE SIMULATION METHOD TO CHECK

NG

REPLACE FORWARD RECOGNITION CAMERA

5.

PERFORM ACTIVE TEST USING GTS

(a) Perform the Active Test according to the display on the GTS.

Body Electrical > Combination Meter > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Automatic High Beam Indicator (Green)

Automatic high beam indicator light

OFF or ON

-

Body Electrical > Combination Meter > Active Test

Tester Display

Automatic High Beam Indicator (Green)

OK:

The automatic high beam indicator illuminates and turns off.

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE COMBINATION METER ASSEMBLY

6.

READ VALUE USING GTS

(a) Read the Data List according to the display on the GTS.

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Auto High Beam Main Switch

Auto high beam switch signal

OFF or ON

OFF: Auto high beam switch not pressed

ON: Auto 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 9

OK

7.

READ VALUE USING GTS

(a) Read the Data List according to the display on the GTS.

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Automatic High Beam Headlights Sensor Detection Status

Automatic high beam sensor current state

Undetected, N/A, Nosens, Headlight,Taillight, Speed,Daytime, Village,Other sens, Change,Out of aim, SAEMod, Aim adjust or LIN Err

Condition can be displayed

-

Body Electrical > Main Body > Data List

Tester Display

Automatic High Beam Headlights Sensor Detection Status

OK:

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

NG

REPLACE FORWARD RECOGNITION CAMERA

OK

8.

PERFORM ACTIVE TEST USING GTS

(a) Perform the Active Test according to the display on the GTS.

Body Electrical > Combination Meter > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Automatic High Beam Indicator (Green)

Automatic high beam indicator light

OFF or ON

-

Body Electrical > Combination Meter > Active Test

Tester Display

Automatic High Beam Indicator (Green)

OK:

The automatic high beam indicator illuminates and turns off.

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE COMBINATION METER ASSEMBLY

9.

INSPECT AUTO HIGH BEAM SWITCH

Click here

NG

REPLACE AUTO HIGH BEAM SWITCH

OK

10.

CHECK HARNESS AND CONNECTOR (AUTO HIGH BEAM SWITCH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND BODY GROUND)

(a) Disconnect the H4 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

H47-5 (+B) - H4-14 (AHBI)

Always

Below 1 Ω

H47-5 (+B) or H4-14 (AHBI) - Body ground

Always

10 kΩ or higher

H47-2 (E) - Body ground

Always

Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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