Toyota Yaris: Lighting System / Ambient Illumination Light Circuit

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / Lighting (int) / Lighting System / Ambient Illumination Light Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the operation of the following lights:

  • Front Door Ambient Illumination Light
    • Front Door Ambient Illumination Light LH (Front Door Trim Board Sub-assembly LH)
    • Front Door Ambient Illumination Light RH (Front Door Trim Board Sub-assembly RH)

WIRING DIAGRAM

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

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

Front Footwell Lights

Front Door Trim Illumination

OFF or ON

*1

  • *1: w/ Ambient Illumination Light
Body Electrical > Main Body > Active Test

Tester Display

Front Footwell Lights

Result

Proceed to

OK

A

NG (All illuminations do not come on)

B

A

USE SIMULATION METHOD TO CHECK

B

2.

CHECK HARNESS AND CONNECTOR (POWER SOURCE - POWER DISTRIBUTION BOX ASSEMBLY)

(a) Disconnect the 4F power distribution box assembly connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

4F-1 - Body ground

Ignition switch off

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK POWER DISTRIBUTION BOX ASSEMBLY

*a

Component without harness connected

(Power Distribution Box Assembly)

-

-

(a) Disconnect the 4B power distribution box assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4F-1 - 4B-28

Always

Below 1 Ω

NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

OK

4.

INSPECT POWER DISTRIBUTION BOX ASSEMBLY

*a

Component without harness connected

(Power Distribution Box Assembly)

-

-

(a) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4C-18 - MB-16 (FSPT)

Always

Below 1 Ω

4C-19 - MB-16 (FSPT)

Always

Below 1 Ω

4E-22 - MB-16 (FSPT)

Always

Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

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    Categories

    Liftgate/Trunk Lid

    WARNING

    Never allow a person to ride in the luggage compartment/trunk

    Allowing a person to ride in the luggage compartment/trunk is dangerous. The person in the luggage compartment/trunk could be seriously injured or killed during sudden braking or a collision.

    Do not drive with the liftgate/trunk lid open

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