Toyota Yaris: Lighting System / High Beam Headlight Circuit

Toyota Yaris XP210 (2020-2023) Reapir and Service Manual / Vehicle Exterior / Lighting (ext) / Lighting System / High Beam Headlight Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the high beam headlights.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

    Click here

  • Check the operation of the low beam headlights. If the low beam headlights do not operate normally, refer to Problem Symptoms Table.

    Click here

  • First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication malfunctions before troubleshooting this symptom.

    Click here

  • First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CXPI communication malfunctions before troubleshooting this symptom.

    Click here

PROCEDURE

1.

PERFORM ACTIVE TEST USING GTS

(a) Enter the following menus: Body Electrical / Main Body / Active Test.

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

Body Electrical > Main Body > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

High Beam Headlight

High beam headlights

OFF or ON

-

Body Electrical > Main Body > Active Test

Tester Display

High Beam Headlight

OK:

High beam headlights illuminate.

Result

Proceed to

OK

A

NG (LH side high beam light does not illuminate.)

B

NG (RH side high beam light does not illuminate.)

C

A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

C

GO TO STEP 5

B

2.

CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT ASSEMBLY LH - LIGHT CONTROL LED ECU LH)

*a

Component without harness connected

(to Wire Harness)

*b

Component without harness connected

(to Light Control LED ECU)

*c

Component without harness connected

(to Headlight Unit Assembly LH)

-

-

(a) Remove the headlight assembly LH.

Click here

(b) Remove the wire harness.

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A-[2] - B-[15]

Always

Below 1 Ω

A-[4] - B-[4]

Always

Below 1 Ω

A4-2 (LO) - B-[19]

Always

Below 1 Ω

A4-5 (E) - B-[8]

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK LIGHT CONTROL LED ECU LH

(a) Interchange the light control LED ECU LH with RH and connect the connectors to them.

Click here

NEXT

4.

CHECK OPERATION (HIGH BEAM HEADLIGHT)

(a) Check that the low beam headlight operates normally.

OK:

High beam headlight operates normally.

OK

REPLACE LIGHT CONTROL LED ECU LH

NG

REPLACE HEADLIGHT UNIT ASSEMBLY LH

5.

CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - LIGHT CONTROL ECU)

*a

Component without harness connected

(to Wire Harness)

*b

Component without harness connected

(to Light Control ECU)

*c

Component without harness connected

(to Headlight Unit Assembly RH)

-

-

(a) Remove the headlight assembly RH.

Click here

(b) Remove the wire harness.

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A-[2] - B-[15]

Always

Below 1 Ω

A-[4] - B-[4]

Always

Below 1 Ω

A5-2 (LO) - B-[19]

Always

Below 1 Ω

A5-5 (E) - B-[8]

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

CHECK LIGHT CONTROL LED ECU RH

(a) Interchange the light control LED ECU RH with LH and connect the connectors to them.

Click here

NEXT

7.

CHECK OPERATION (HIGH BEAM HEADLIGHT)

(a) Check that the low beam headlight operates normally.

OK:

High beam headlight operates normally.

OK

REPLACE LIGHT CONTROL LED ECU RH

NG

REPLACE HEADLIGHT UNIT ASSEMBLY RH

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    Toyota Yaris XP210 (2020-2023) Owner's Manual: Pictorial Index


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