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 Gasoline Model With Cornering Light) / Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
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If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information the headlight ECU sub-assembly LH.
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If the headlight assembly LH has been replaced, it is necessary to synchronize the vehicle information the headlight ECU sub-assembly LH.
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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
Left low beam headlight does not illuminate	Headlight assembly LH
Right low beam headlight does not illuminate	Headlight ECU sub-assembly RH
Right low beam headlight does not illuminate	Headlight assembly RH
Both left and right low beam headlights do not illuminate	Headlight dimmer switch circuit
Both left and right low beam headlights do not illuminate	Main body ECU (Multiplex network body ECU)
Left high beam headlight does not illuminate	High beam headlight circuit
Left high beam headlight does not illuminate	Headlight assembly LH
Right high beam headlight does not illuminate	High beam headlight circuit
Right high beam headlight does not illuminate	Headlight assembly RH
Both left and right high beam headlights do not illuminate	Headlight dimmer switch circuit
Both left and right high beam headlights do not illuminate	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)
Left low beam headlight and high beam headlight do not illuminate	Headlight ECU sub-assembly LH
Right low beam headlight and high beam headlight do not illuminate	Headlight ECU sub-assembly RH

Parking Light/Daytime Running Light

Symptom	Suspected Area	Link
Left parking light/daytime running light does not illuminate	Parking light/daytime running light circuit
	Headlight ECU sub-assembly LH
Right parking light/daytime running light does not illuminate	Parking light/daytime running light circuit
	Headlight ECU sub-assembly RH
Both left and right parking lights do not illuminate	Headlight dimmer switch circuit
Both left and right parking lights do not illuminate	Main body ECU (Multiplex network body ECU)
Both left and right daytime running lights do not illuminate	Check customize settings
	Headlight dimmer switch circuit
	Main body ECU (Multiplex network body ECU)

Cornering Light

Symptom	Suspected Area	Link
Left cornering light does not illuminate	Check operating conditions
	Cornering light circuit
	Headlight ECU sub-assembly LH
Right cornering light does not illuminate	Check operating conditions
	Cornering light circuit
	Headlight ECU sub-assembly RH

Front Side Marker Light

Symptom	Suspected Area	Link
Left front side marker light does not illuminate	Front side marker light circuit
Left front side marker light does not illuminate	Headlight ECU sub-assembly LH
Right front side marker light does not illuminate	Front side marker light circuit
Right front side marker light does not illuminate	Headlight ECU sub-assembly RH
Both left and right front side marker lights do not illuminate	Headlight dimmer switch circuit
	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, 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
Left or right rear side marker light does not illuminate	Rear combination light socket and wire

License Plate Light

Symptom	Suspected Area	Link
License plate light does not illuminate	License plate light assembly
License plate light does not illuminate	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
	Rear combination light socket and wire
	Harness or connector	-
Left or right stop light (rear light assembly) does not illuminate	Rear light assembly
	Rear light cord
	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
High mounted stop light does not illuminate	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	BKUP LP fuse	-
	ECU-ACC fuse	-
	Park/neutral position switch assembly
	Instrument panel junction block assembly
	Harness or connector	-

Turn Signal Light

Symptom	Suspected Area	Link
Left or right front turn signal light does not operate	Headlight ECU sub-assembly
	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
	Rear light assembly
	Rear light cord
	Harness or connector	-
Left or right side turn signal light does not operate	Side turn signal light assembly
	Outer rear view mirror assembly
	Outer mirror control ECU assembly
	Harness or connector	-
Turn signal lights do not operate in one direction	Turn signal switch circuit
Turn signal lights do not operate in one direction	Meter/gauge system
All turn signal lights do not operate	Turn signal switch circuit
All turn signal lights do not operate	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
Hazard warning signal lights do not operate	Combination meter assembly

Automatic Light Control System

Symptom	Suspected Area	Link
Automatic light control system does not operate	Headlight dimmer switch circuit
Automatic light control system does not operate	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
Welcome light illumination control does not operate	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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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Problem Symptoms Table

Precaution

System Diagram

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