Toyota Yaris: Lighting System / Rear Fog Light Circuit

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

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the rear fog light.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

    Click here

  • First, confirm that there is no malfunction in the power integration system. Refer to the How to Proceed with Troubleshooting procedure.

    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.

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  • 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.

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PROCEDURE

1.

READ VALUE USING GTS

(a) Turn the light control switch to the TAIL position.

(b) Turn the rear fog light switch on.

(c) Using the GTS, read the Data List.

Body Electrical > Power Distribution Box > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Rear Fog Light Fuse Shut Off Status

Rear fog light fuse condition

OFF or ON

OFF: Rear fog light fuse not shut off

ON: Rear fog light fuse shut off

-

Body Electrical > Power Distribution Box > Data List

Tester Display

Rear Fog Light Fuse Shut Off Status

OK:

The Data List value displays "OFF".

NG

GO TO STEP 3

OK

2.

READ VALUE USING GTS

(a) Using the GTS, read the Data List.

Body Electrical > Power Distribution Box > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Rear Fog Light Output Signal

Rear fog light output

OFF or ON

OFF: Rear fog light is not output

ON: Rear fog light is output

-

Body Electrical > Power Distribution Box > Data List

Tester Display

Rear Fog Light Output Signal

OK:

Display changes according to the rear fog light switch operation.

OK

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

3.

INSPECT REAR FOG LIGHT ASSEMBLY

(a) Disconnect the W8 rear fog light LED connector.

(b) Turn the rear fog light switch off.

(c) Turn the rear fog light switch on.

(d) Using the GTS, read the Data List.

Body Electrical > Power Distribution Box > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Rear Fog Light Fuse Shut Off Status

Rear fog light fuse condition

OFF or ON

OFF: Rear fog light fuse not shut off

ON: Rear fog light fuse shut off

-

OK:

The Data List value displays "OFF".

OK

REPLACE REAR FOG LIGHT ASSEMBLY

NG

4.

CHECK HARNESS AND CONNECTOR

(a) Disconnect the W8 rear fog light LED connector.

(b) Disconnect the cable from the negative (-) auxiliary battery terminal.

(c) Disconnect the 4E power distribution box assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

W8-2 (B) or 4E-7 - Body ground

Always

10 kΩ or higher

OK

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

NG

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