Toyota Yaris: Lighting System / Front Fog Light Circuit

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

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the front fog lights.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

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

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  • 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 front fog light switch on.

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

Body Electrical > Power Integration No.1 > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Front Fog Light Fuse Shut Off Status

Front fog light fuse condition

OFF or ON

OFF: Front fog light fuse not shut off

ON: Front fog light fuse shut off

  • Light control switch in tail position
  • w/ Front Fog Light
Body Electrical > Power Integration No.1 > Data List

Tester Display

Front 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 Integration No.1 > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Front Fog Light Output Signal

Front fog light output

OFF or ON

OFF: Front fog light is not output

ON: Front fog light is output

  • Light control switch in tail position
  • w/ Front Fog Light
Body Electrical > Power Integration No.1 > Data List

Tester Display

Front Fog Light Output Signal

OK:

Display changes according to the front fog light switch operation.

OK

REPLACE SEMICONDUCTOR POWER INTEGRATION ECU

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

3.

INSPECT FRONT FOG LIGHT ASSEMBLY LH

(a) Disconnect the A104 front fog light assembly LH connector.

(b) Turn the front fog light switch off.

(c) Turn the front fog light switch on.

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

Body Electrical > Power Integration No.1 > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Front Fog Light Fuse Shut Off Status

Front fog light fuse condition

OFF or ON

OFF: Front fog light fuse not shut off

ON: Front fog light fuse shut off

  • Light control switch in tail position
  • w/ Front Fog Light

OK:

The Data List value displays "OFF".

OK

REPLACE FRONT FOG LIGHT ASSEMBLY LH

NG

4.

INSPECT FRONT FOG LIGHT ASSEMBLY RH

(a) Disconnect the A105 front fog light assembly RH connector.

(b) Turn the front fog light switch off.

(c) Turn the front fog light switch on.

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

Body Electrical > Power Integration No.1 > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Front Fog Light Fuse Shut Off Status

Front fog light fuse condition

OFF or ON

OFF: Front fog light fuse not shut off

ON: Front fog light fuse shut off

  • Light control switch in tail position
  • w/ Front Fog Light

OK:

The Data List value displays "OFF".

OK

REPLACE FRONT FOG LIGHT ASSEMBLY RH

NG

5.

CHECK HARNESS AND CONNECTOR

(a) Disconnect the A104 front fog light assembly LH connector.

(b) Disconnect the A105 front fog light assembly RH connector.

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

(d) Disconnect the A86 semiconductor power integration computer connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A104-2 (B) or A86-18 (L) - Body ground

Always

10 kΩ or higher

A105-2 (B) or A86-17 (L) - Body ground

Always

10 kΩ or higher

OK

REPLACE SEMICONDUCTOR POWER INTEGRATION ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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