Toyota Yaris: Lighting System / Clearance Light/Daytime Running Light Circuit

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Vehicle Exterior / Lighting (ext) / Lighting System / Clearance Light/Daytime Running Light Circuit

DESCRIPTION

  • Clearance light function:

    When the main body ECU (multiplex network body ECU) receives the light control switch position signal, it sends an illumination request signal to the light control LED ECU and illuminates the clearance lights.

  • Daytime running light function:

    When the operation conditions of the daytime running lights are met, the main body ECU (multiplex network body ECU) sends an illumination request signal to the light control LED ECU and illuminates the daytime running lights.

WIRING DIAGRAM

HEADLIGHT ASSEMBLY CIRCUIT

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

    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) Using the GTS, perform the Active Test.

Body Electrical > Main Body > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Daytime Running Light

Daytime running lights

OFF or ON

-

Body Electrical > Main Body > Active Test

Tester Display

Daytime Running Light

OK:

Clearance lights and daytime running lights illuminate.

Result

Proceed to

OK

A

NG (LH side clearance light and daytime running light does not illuminate.)

B

NG (RH side clearance light and daytime running light does not illuminate.)

C

A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

C

GO TO STEP 7

B

2.

INSPECT HEADLIGHT ASSEMBLY LH (LO TERMINAL VOLTAGE)

(a) Disconnect the A4 headlight unit assembly LH connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A4-2 (LO) - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - BODY GROUND)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A4-5 (E) - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK HARNESS AND CONNECTOR (HEADLIGHT LENS SUB-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 Lens Sub-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

B-[17] - C-[2]

Always

Below 1 Ω

B-[6] - C-[1]

Always

Below 1 Ω

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

Always

Below 1 Ω

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

Always

Below 1 Ω

NG

REPLACE HARNESS OR CONNECTOR

OK

5.

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

6.

CHECK OPERATION (DAYTIME RUNNING LIGHT)

(a) Check that the daytime running light operates normally.

OK:

Daytime running light operates normally.

OK

REPLACE LIGHT CONTROL LED ECU LH

NG

REPLACE HEADLIGHT LENS SUB-ASSEMBLY

7.

INSPECT HEADLIGHT ASSEMBLY RH (LO TERMINAL VOLTAGE)

(a) Disconnect the A5 headlight assembly RH connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A5-2 (LO) - Body ground

Always

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.

CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - BODY GROUND)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A5-5 (E) - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

9.

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

*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 Lens Sub-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

B-[17] - C-[2]

Always

Below 1 Ω

B-[6] - C-[1]

Always

Below 1 Ω

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

Always

Below 1 Ω

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

Always

Below 1 Ω

NG

REPLACE HARNESS OR CONNECTOR

OK

10.

CHECK LIGHT CONTROL LED ECU RH

(a) Interchange the headlight unit assembly RH with LH and connect the connectors to them.

Click here

NEXT

11.

CHECK OPERATION (DAYTIME RUNNING LIGHT)

(a) Check that the daytime running light operates normally.

OK:

Daytime running light operates normally.

OK

REPLACE LIGHT CONTROL LED ECU RH

NG

REPLACE HEADLIGHT LENS SUB-ASSEMBLY

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