Toyota Yaris: Lighting System / LO-beam Headlight does not Illuminate

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Vehicle Exterior / Lighting (ext) / Lighting System / LO-beam Headlight does not Illuminate

DESCRIPTION

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

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • 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) 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

Low Beam Headlight

Low beam headlights

OFF or ON

-

Body Electrical > Main Body > Active Test

Tester Display

Low Beam Headlight

OK:

Low beam headlights illuminate.

Result

Proceed to

OK

A

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

B

NG (RH side low beam 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 assembly LH connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A4-2 (LO) - Body ground

Light control switch in head position

11 to 14 V

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 UNIT ASSEMBLY LH - LIGHT CONTROL 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)

-

-

(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-[1] - B-[16]

Always

Below 1 Ω

A-[3] - B-[5]

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.

INSPECT LIGHT CONTROL LED ECU LH

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

NEXT

6.

CHECK OPERATION (LOW BEAM HEADLIGHT)

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

OK:

Low beam headlight operates normally.

OK

REPLACE LIGHT CONTROL LED ECU LH

NG

REPLACE HEADLAMP UNIT ASSEMBLY LH

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

Condition

Specified Condition

A5-2 (LO) - Body ground

Light control switch in head position

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 UNIT ASSEMBLY RH - LIGHT CONTROL 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 Unit Assembly)

-

-

(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-[1] - B-[16]

Always

Below 1 Ω

A-[3] - B-[5]

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.

INSPECT LIGHT CONTROL LED ECU RH

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

Click here

NEXT

11.

CHECK OPERATION (LOW BEAM HEADLIGHT)

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

OK:

Low beam headlight operates normally.

OK

REPLACE LIGHT CONTROL LED ECU RH

NG

REPLACE HEADLIGHT UNIT ASSEMBLY RH

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