Toyota Yaris: Lighting System / Taillight Relay Circuit

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Vehicle Exterior / Lighting (ext) / Lighting System / Taillight Relay Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the, taillight and license plate light.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • 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.

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

Tail Light Input Signal

Tail light input

OFF or ON

OFF: Taillight is not input

ON: Tail light is input

-

Body Electrical > Power Distribution Box > Data List

Tester Display

Tail Light Input Signal

OK:

Display changes according to the taillight illumination condition.

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

OK

2.

READ VALUE USING GTS

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

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

Body Electrical > Power Distribution Box > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Tail Light Fuse Shut Off Status

Tail light fuse condition

OFF or ON

OFF: Taillight fuse not shut off

ON: Taillight fuse shut off

-

Body Electrical > Power Distribution Box > Data List

Tester Display

Tail Light Fuse Shut Off Status

OK:

The Data List value displays "OFF".

NG

GO TO STEP 4

OK

3.

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

Tail Light Output Signal

Tail light output

OFF or ON

OFF: Taillight is not output

ON: Tail light is output

-

Body Electrical > Power Distribution Box > Data List

Tester Display

Tail Light Output Signal

OK:

Display changes according to the taillight illumination condition.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

4.

INSPECT REAR COMBINATION LIGHT LENS AND BODY LH

(a) Disconnect the O107 rear combination light lens and body LH connector.

(b) Turn the light control switch to the AUTO (OFF) position.

NOTICE:

If the low beam headlights or clearance lights illuminate when the ignition switch is turned ON, shine a light on the automatic light control sensor to turn the low beam headlights off before operating the headlight dimmer switch.

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

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

Body Electrical > Power Distribution Box > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Tail Light Fuse Shut Off Status

Tail light fuse condition

OFF or ON

OFF: Taillight fuse not shut off

ON: Taillight fuse shut off

-

Body Electrical > Power Distribution Box > Data List

Tester Display

Tail Light Fuse Shut Off Status

OK:

The Data List value displays "OFF".

OK

REPLACE REAR COMBINATION LIGHT LENS AND BODY LH

NG

5.

INSPECT REAR COMBINATION LIGHT LENS AND BODY RH

(a) Disconnect the O108 rear combination light lens and body RH connector.

(b) Turn the light control switch to the AUTO (OFF) position.

NOTICE:

If the low beam headlights or clearance lights illuminate when the ignition switch is turned ON, shine a light on the automatic light control sensor to turn the low beam headlights off before operating the headlight dimmer switch.

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

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

Body Electrical > Power Distribution Box > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Tail Light Fuse Shut Off Status

Tail light fuse condition

OFF or ON

OFF: Taillight fuse not shut off

ON: Taillight fuse shut off

-

Body Electrical > Power Distribution Box > Data List

Tester Display

Tail Light Fuse Shut Off Status

OK:

The Data List value displays "OFF".

OK

REPLACE REAR COMBINATION LIGHT LENS AND BODY RH

NG

6.

INSPECT LICENSE PLATE LIGHT ASSEMBLY LH

(a) Disconnect the Y3 license plate light assembly LH connector.

(b) Turn the light control switch to the AUTO (OFF) position.

NOTICE:

If the low beam headlights or clearance lights illuminate when the ignition switch is turned ON, shine a light on the automatic light control sensor to turn the low beam headlights off before operating the headlight dimmer switch.

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

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

Body Electrical > Power Distribution Box > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Tail Light Fuse Shut Off Status

Tail light fuse condition

OFF or ON

OFF: Taillight fuse not shut off

ON: Taillight fuse shut off

-

Body Electrical > Power Distribution Box > Data List

Tester Display

Tail Light Fuse Shut Off Status

OK:

The Data List value displays "OFF".

OK

REPLACE LICENSE PLATE LIGHT ASSEMBLY LH

NG

7.

INSPECT LICENSE PLATE LIGHT ASSEMBLY RH

(a) Disconnect the Y4 license plate light assembly RH connector.

(b) Turn the light control switch to the AUTO (OFF) position.

NOTICE:

If the low beam headlights or clearance lights illuminate when the ignition switch is turned ON, shine a light on the automatic light control sensor to turn the low beam headlights off before operating the headlight dimmer switch.

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

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

Body Electrical > Power Distribution Box > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Tail Light Fuse Shut Off Status

Tail light fuse condition

OFF or ON

OFF: Taillight fuse not shut off

ON: Taillight fuse shut off

-

Body Electrical > Power Distribution Box > Data List

Tester Display

Tail Light Fuse Shut Off Status

OK:

The Data List value displays "OFF".

OK

REPLACE LICENSE PLATE LIGHT ASSEMBLY RH

NG

8.

CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - REAR COMBINATION LIGHT LENS AND BODY AND LICENSE PLATE LIGHT ASSEMBLY)

(a) Disconnect the O107 rear combination light lens and body LH connector.

(b) Disconnect the O108 rear combination light lens and body RH connector.

(c) Disconnect the Y3 license plate light assembly LH connector.

(d) Disconnect the Y4 license plate light assembly RH connector.

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

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O107-2 (B) or 4E-30 - Body ground

Always

10 kΩ or higher

O108-2 (B) or 4E-30 - Body ground

Always

10 kΩ or higher

Y3-1 (B) or 4E-30 - Body ground

Always

10 kΩ or higher

Y4-1 (B) or 4E-30 - Body ground

Always

10 kΩ or higher

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

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