Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001AYAP
Model Year Start: 2019 Model: Avalon Prod Date Range: [04/2018 - 08/2020]
Title: LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): PROBLEM SYMPTOMS TABLE; 2019 - 2020 MY Avalon [04/2018 - 08/2020]

PROBLEM SYMPTOMS TABLE

NOTICE:

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

    Click here 2019 - 2020 MY Avalon [04/2018 - 08/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION

  • If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information the headlight ECU sub-assembly LH.

    Click here 2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): INITIALIZATION

  • If the headlight assembly LH has been replaced, it is necessary to synchronize the vehicle information the headlight ECU sub-assembly LH.

    Click here 2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): INITIALIZATION

  • 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

Headlight ECU sub-assembly LH

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): HEADLIGHT ECU: REMOVAL

Headlight assembly LH

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): HEADLIGHT ASSEMBLY: REMOVAL

Right low beam headlight does not illuminate

Headlight ECU sub-assembly RH

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): HEADLIGHT ECU: REMOVAL

Headlight assembly RH

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): HEADLIGHT ASSEMBLY: REMOVAL

Both left and right low beam headlights do not illuminate

Headlight dimmer switch circuit

2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): Headlight Dimmer Switch Circuit

Main body ECU (Multiplex network body ECU)

2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Left high beam headlight does not illuminate

High beam headlight circuit

2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): High Beam Headlight Circuit

Headlight assembly LH

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): HEADLIGHT ASSEMBLY: REMOVAL

Right high beam headlight does not illuminate

High beam headlight circuit

2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): High Beam Headlight Circuit

Headlight assembly RH

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): HEADLIGHT ASSEMBLY: REMOVAL

Both left and right high beam headlights do not illuminate

Headlight dimmer switch circuit

2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): Headlight Dimmer Switch Circuit

Main body ECU (Multiplex network body ECU)

2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

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

Headlight dimmer switch circuit

2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): Headlight Dimmer Switch Circuit

Main body ECU (Multiplex network body ECU)

2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Left low beam headlight and high beam headlight do not illuminate

Headlight ECU sub-assembly LH

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): HEADLIGHT ECU: REMOVAL

Right low beam headlight and high beam headlight do not illuminate

Headlight ECU sub-assembly RH

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): HEADLIGHT ECU: REMOVAL

Parking Light/Daytime Running Light

Symptom

Suspected Area

Link

Left parking light/daytime running light does not illuminate

Parking light/daytime running light circuit

2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): Parking Light/Daytime Running Light Circuit

Headlight ECU sub-assembly LH

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): HEADLIGHT ECU: REMOVAL

Right parking light/daytime running light does not illuminate

Parking light/daytime running light circuit

2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): Parking Light/Daytime Running Light Circuit

Headlight ECU sub-assembly RH

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): HEADLIGHT ECU: REMOVAL

Both left and right parking lights do not illuminate

Headlight dimmer switch circuit

2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): Headlight Dimmer Switch Circuit

Main body ECU (Multiplex network body ECU)

2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Both left and right daytime running lights do not illuminate

Check customize settings

2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): CUSTOMIZE PARAMETERS

Headlight dimmer switch circuit

2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): Headlight Dimmer Switch Circuit

Main body ECU (Multiplex network body ECU)

2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Cornering Light

Symptom

Suspected Area

Link

Left cornering light does not illuminate

Check operating conditions

2019 - 2021 MY Avalon [04/2018 - 08/2021]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): OPERATION CHECK

Cornering light circuit

2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): Cornering Light Circuit

Headlight ECU sub-assembly LH

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): HEADLIGHT ECU: REMOVAL

Right cornering light does not illuminate

Check operating conditions

2019 - 2021 MY Avalon [04/2018 - 08/2021]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): OPERATION CHECK

Cornering light circuit

2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): Cornering Light Circuit

Headlight ECU sub-assembly RH

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): HEADLIGHT ECU: REMOVAL

Front Side Marker Light

Symptom

Suspected Area

Link

Left front side marker light does not illuminate

Front side marker light circuit

2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): Front Side Marker Light Circuit

Headlight ECU sub-assembly LH

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): HEADLIGHT ECU: REMOVAL

Right front side marker light does not illuminate

Front side marker light circuit

2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): Front Side Marker Light Circuit

Headlight ECU sub-assembly RH

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): HEADLIGHT ECU: REMOVAL

Both left and right front side marker lights do not illuminate

Headlight dimmer switch circuit

2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): Headlight Dimmer Switch Circuit

Main body ECU (Multiplex network body ECU)

2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Taillight

Symptom

Suspected Area

Link

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

Rear combination light assembly

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): REAR COMBINATION LIGHT ASSEMBLY: INSPECTION

Rear combination light socket and wire

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): REAR COMBINATION LIGHT ASSEMBLY: DISASSEMBLY

Harness or connector

-

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

Rear light assembly

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): REAR LIGHT ASSEMBLY: INSPECTION

Rear light cord

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): REAR LIGHT ASSEMBLY: REMOVAL

Harness or connector

-

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

Headlight dimmer switch circuit

2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): Headlight Dimmer Switch Circuit

Taillight relay circuit

2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): Taillight Relay Circuit

Main body ECU (Multiplex network body ECU)

2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Rear Side Marker Light

Symptom

Suspected Area

Link

Left or right rear side marker light does not illuminate

Rear combination light assembly

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): REAR COMBINATION LIGHT ASSEMBLY: INSPECTION

Rear combination light socket and wire

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): REAR COMBINATION LIGHT ASSEMBLY: DISASSEMBLY

License Plate Light

Symptom

Suspected Area

Link

License plate light does not illuminate

License plate light assembly

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): LICENSE PLATE LIGHT ASSEMBLY: INSPECTION

Harness or connector

-

Stop Light

Symptom

Suspected Area

Link

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

Rear combination light assembly

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): REAR COMBINATION LIGHT ASSEMBLY: INSPECTION

Rear combination light socket and wire

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): REAR COMBINATION LIGHT ASSEMBLY: DISASSEMBLY

Harness or connector

-

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

Rear light assembly

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): REAR LIGHT ASSEMBLY: INSPECTION

Rear light cord

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): REAR LIGHT ASSEMBLY: REMOVAL

Harness or connector

-

All of the stop lights do not illuminate

STOP fuse

-

Stop light switch assembly

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): STOP LIGHT SWITCH: ON-VEHICLE INSPECTION

Harness or connector

-

High Mounted Stop Light

Symptom

Suspected Area

Link

High mounted stop light does not illuminate

Center stop light set

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): HIGH MOUNTED STOP LIGHT ASSEMBLY: INSPECTION

Harness or connector

-

Back-up Light

Symptom

Suspected Area

Link

Left or right back-up light does not illuminate

Rear light assembly

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): REAR LIGHT ASSEMBLY: INSPECTION

Rear light cord

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): REAR LIGHT ASSEMBLY: REMOVAL

Harness or connector

-

Both left and right back-up lights do not illuminate

BKUP LP fuse

-

ECU-ACC fuse

-

Park/neutral position switch assembly

2019 - 2022 MY Avalon [04/2018 -        ]; UA80E (AUTOMATIC TRANSMISSION / TRANSAXLE): PARK / NEUTRAL POSITION SWITCH: INSPECTION

Instrument panel junction block assembly

2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Harness or connector

-

Turn Signal Light

Symptom

Suspected Area

Link

Left or right front turn signal light does not operate

Headlight ECU sub-assembly

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): HEADLIGHT ECU: REMOVAL

Headlight assembly

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): HEADLIGHT ASSEMBLY: REMOVAL

Harness or connector

-

Left or right rear turn signal light does not operate

Rear combination light assembly

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): REAR COMBINATION LIGHT ASSEMBLY: INSPECTION

Rear combination light socket and wire

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): REAR COMBINATION LIGHT ASSEMBLY: DISASSEMBLY

Rear light assembly

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): REAR LIGHT ASSEMBLY: INSPECTION

Rear light cord

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): REAR LIGHT ASSEMBLY: REMOVAL

Harness or connector

-

Left or right side turn signal light does not operate

Side turn signal light assembly

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (EXT): SIDE TURN SIGNAL LIGHT ASSEMBLY: INSPECTION

Outer rear view mirror assembly

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; MIRROR (EXT): OUTER REAR VIEW MIRROR: REMOVAL

Outer mirror control ECU assembly

2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; MIRROR (EXT): OUTER MIRROR CONTROL ECU: REMOVAL

Harness or connector

-

Turn signal lights do not operate in one direction

Turn signal switch circuit

2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): Turn Signal Switch Circuit

Meter/gauge system

2019 - 2022 MY Avalon [04/2018 -        ]; METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM (for Gasoline Model): HOW TO PROCEED WITH TROUBLESHOOTING

All turn signal lights do not operate

Turn signal switch circuit

2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): Turn Signal Switch Circuit

Combination meter assembly

2019 - 2020 MY Avalon Avalon HV [04/2018 - 08/2020]; METER / GAUGE / DISPLAY: COMBINATION METER: REMOVAL

All turn signal lights do not flash at the correct speed

Combination meter assembly

2019 - 2020 MY Avalon Avalon HV [04/2018 - 08/2020]; METER / GAUGE / DISPLAY: COMBINATION METER: REMOVAL

Hazard Warning Signal Light

Symptom

Suspected Area

Link

Hazard warning signal lights do not operate

Hazard warning switch circuit

2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): Hazard Warning Switch Circuit

Combination meter assembly

2019 - 2020 MY Avalon Avalon HV [04/2018 - 08/2020]; METER / GAUGE / DISPLAY: COMBINATION METER: REMOVAL

Automatic Light Control System

Symptom

Suspected Area

Link

Automatic light control system does not operate

Headlight dimmer switch circuit

2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): Headlight Dimmer Switch Circuit

Main body ECU (Multiplex network body ECU)

2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Light Auto Turn-off System

Symptom

Suspected Area

Link

Light auto turn-off system does not operate

Headlight dimmer switch circuit

2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): Headlight Dimmer Switch Circuit

IG signal circuit

2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (INT): LIGHTING SYSTEM (for Gasoline Model): IG Signal Circuit

Front door courtesy switch circuit

2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (INT): LIGHTING SYSTEM (for Gasoline Model): Front Door Courtesy Switch Circuit

Main body ECU (Multiplex network body ECU)

2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Remote Operation Function (w/ Telematics System)

Symptom

Suspected Area

Link

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

Telematics system

2019 - 2020 MY Avalon [04/2018 - 08/2020]; TELEMATICS: TELEMATICS SYSTEM (for Gasoline Model): HOW TO PROCEED WITH TROUBLESHOOTING

Wiper-linked Low Beam Headlight Control System

Symptom

Suspected Area

Link

Wiper-linked low beam headlight control system does not operate

Check customize settings

2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): CUSTOMIZE PARAMETERS

Main body ECU (Multiplex network body ECU)

2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Welcome Light Illumination Control

Symptom

Suspected Area

Link

Welcome light illumination control does not operate

Check customize settings

2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): CUSTOMIZE PARAMETERS

Main body ECU (Multiplex network body ECU)

2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

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

2019 - 2021 MY Avalon [04/2018 - 08/2021]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): Automatic High Beam System does not Operate or Operation Indicator does not Illuminate

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"

2019 - 2022 MY Avalon [04/2018 -        ]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with Cornering Light): Automatic High Beam Switch Indicator does not Come ON