Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Problem Symptoms Table

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Vehicle Exterior / Lighting (ext) / Lighting System(for Hv Model Without Cornering Light) / Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

NOTICE:

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

    Click here

  • When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

HINT:

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.

Headlight

Symptom

Suspected Area

Link

Left low beam headlight does not illuminate

Refer to "LO-beam Headlight does not Illuminate"

Right low beam headlight does not illuminate

Refer to "LO-beam Headlight does not Illuminate"

Both left and right low beam headlights do not illuminate

Headlight dimmer switch circuit

Main body ECU (Multiplex network body ECU)

Left high beam headlight does not illuminate

Headlight assembly LH

Harness or connector

-

Right high beam headlight does not illuminate

Headlight assembly RH

Harness or connector

-

Both left and right high beam headlights do not illuminate

Headlight dimmer switch circuit

High beam headlight circuit

Main body ECU (Multiplex network body ECU)

High Flash (passing function) does not operate (high beam headlights are normal)

Headlight dimmer switch circuit

Main body ECU (Multiplex network body ECU)

Parking Light

Symptom

Suspected Area

Link

Left parking light does not illuminate

Headlight assembly LH

Harness or connector

-

Right parking light does not illuminate

Headlight assembly RH

Harness or connector

-

Both left and right parking lights do not illuminate

Taillight relay circuit

Harness or connector

-
Front Side Marker Light

Symptom

Suspected Area

Link

Left front side marker light does not illuminate

Headlight assembly LH

Harness or connector

-

Right front side marker light does not illuminate

Headlight assembly RH

Harness or connector

-

Both left and right front side marker lights do not illuminate

Taillight relay circuit

Harness or connector

-
Daytime Running Light

Symptom

Suspected Area

Link

Left daytime running light does not illuminate

Headlight assembly LH

Harness or connector

-

Right daytime running light does not illuminate

Headlight assembly RH

Harness or connector

-

Both left and right daytime running lights do not illuminate

Check customize settings

Daytime running light circuit

Headlight dimmer switch circuit

IG signal circuit

CAN communication system

Main body ECU (Multiplex network body ECU)

Taillight

Symptom

Suspected Area

Link

Left or right taillight (rear combination light assembly) does not illuminate

Rear combination light assembly

Rear combination light socket and wire

Harness or connector

-

Left or right taillight (rear light assembly) does not illuminate

Rear light assembly

Rear light cord

Harness or connector

-

All of the taillights, parking lights, front side marker light, license plate lights and rear side marker lights do not illuminate

Headlight dimmer switch circuit

Taillight relay circuit

Main body ECU (Multiplex network body ECU)

Rear Side Marker Light

Symptom

Suspected Area

Link

Left or right rear side marker light does not illuminate

Rear combination light assembly

Rear combination light socket and wire

License Plate Light

Symptom

Suspected Area

Link

License plate light does not illuminate

License plate light assembly

Harness or connector

-
Stop Light

Symptom

Suspected Area

Link

Left or right stop light does not illuminate

Rear combination light assembly

Rear combination light socket and wire

Harness or connector

-

All of the stop lights do not illuminate

STOP fuse

-

Stop light switch assembly

Harness or connector

-
High Mounted Stop Light

Symptom

Suspected Area

Link

High mounted stop light does not illuminate

Center stop light set

Harness or connector

-
Back-up Light

Symptom

Suspected Area

Link

Left or right back-up light does not illuminate

Rear light assembly

Rear light cord

Harness or connector

-

Both left and right back-up lights do not illuminate

Back-up light circuit

Turn Signal Light

Symptom

Suspected Area

Link

Left or right front turn signal light does not operate

Headlight assembly

Harness or connector

-

Left or right rear turn signal light does not operate

Rear combination light assembly

Rear combination light socket and wire

Harness or connector

-

Left or right side turn signal light does not operate

Side turn signal light assembly

Outer rear view mirror assembly

Harness or connector

-

Turn signal lights do not operate in one direction

Turn signal switch circuit

Meter/gauge system

All turn signal lights do not operate

Turn signal switch circuit

Combination meter assembly

All turn signal lights do not flash at the correct speed

Combination meter assembly

Hazard Warning Signal Light

Symptom

Suspected Area

Link

Hazard warning signal lights do not operate

Hazard warning switch circuit

Combination meter assembly

Automatic Light Control System

Symptom

Suspected Area

Link

Automatic light control system does not operate

Headlight dimmer switch circuit

Main body ECU (Multiplex network body ECU)

Light Auto Turn-off System

Symptom

Suspected Area

Link

Light auto turn-off system does not operate

Headlight dimmer switch circuit

IG signal circuit

Front door courtesy switch circuit

Main body ECU (Multiplex network body ECU)

Remote Operation Function (w/ Telematics System)

Symptom

Suspected Area

Link

Lights do not operate using remote operation function (lighting system is normal)

Telematics system

Wiper-linked Low Beam Headlight Control System

Symptom

Suspected Area

Link

Wiper-linked low beam headlight control system does not operate

Check customize settings

Main body ECU (Multiplex network body ECU)

Welcome Light Illumination Control

Symptom

Suspected Area

Link

Welcome light illumination control does not operate

Check customize settings

Main body ECU (Multiplex network body ECU)

Automatic High Beam System

Symptom

Suspected Area

Link

Automatic high beam system does not operate or automatic high beam indicator does not illuminate (low beam headlights and high beam headlights are normal)

Check millimeter wave radar sensor assembly

Check Data List (High Temperature Status1)

Check automatic high beam indicator light

Check Data List (Auto H Beam STS0)

Perform Active Test (Multi Display All (White))

Auto high beam switch

Harness or connector

Combination meter assembly

Forward recognition camera

Main body ECU (Multiplex network body ECU)

Auto high beam switch indicator does not come ON

Refer to "Automatic High Beam Switch Indicator does not Come ON"

    Precaution

    System Diagram

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