Problem Symptoms Table [06/2018 - 01/2019]

WARNING: This page is about a different car, the 2022 Toyota Corolla, 2021 Toyota Corolla, 2020 Toyota Corolla, and 2019 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Refer to REGISTRATION [06/2018 - 01/2019]
If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the headlight ECU sub-assembly LH.
Refer to INITIALIZATION [06/2018 - 06/2021]
When replacing the headlight ECU sub-assembly LH, always replace it with a new one. If a headlight ECU sub-assembly LH 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.
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	Refer to REMOVAL [06/2018 - 09/2022]
Left low beam headlight does not illuminate	Headlight unit assembly LH	Refer to DISASSEMBLY [06/2018 - 01/2019]
Right low beam headlight does not illuminate	Headlight ECU sub-assembly RH	Refer to REMOVAL [06/2018 - 09/2022]
Right low beam headlight does not illuminate	Headlight unit assembly RH	Refer to DISASSEMBLY [06/2018 - 01/2019]
Both left and right low beam headlights do not illuminate	Headlight dimmer switch circuit	Refer to Headlight Dimmer Switch Circuit [06/2018 - 01/2019]
Both left and right low beam headlights do not illuminate	Main body ECU (Multiplex network body ECU)	Refer to REMOVAL [06/2018 - 01/2019]
Left high beam headlight does not illuminate	High beam headlight circuit	Refer to High Beam Headlight Circuit [06/2018 - 09/2022]
Left high beam headlight does not illuminate	Headlight ECU sub-assembly LH	Refer to REMOVAL [06/2018 - 09/2022]
Right high beam headlight does not illuminate	High beam headlight circuit	Refer to High Beam Headlight Circuit [06/2018 - 09/2022]
Right high beam headlight does not illuminate	Headlight ECU sub-assembly RH	Refer to REMOVAL [06/2018 - 09/2022]
Both left and right high beam headlights do not illuminate	Headlight dimmer switch circuit	Refer to Headlight Dimmer Switch Circuit [06/2018 - 01/2019]
Both left and right high beam headlights do not illuminate	Main body ECU (Multiplex network body ECU)	Refer to REMOVAL [06/2018 - 01/2019]
High Flash (passing function) does not operate (high beam headlights are normal)	Headlight dimmer switch circuit	Refer to Headlight Dimmer Switch Circuit [06/2018 - 01/2019]
	Main body ECU (Multiplex network body ECU)	Refer to REMOVAL [06/2018 - 01/2019]
Left low beam headlight and high beam headlight do not illuminate	Headlight ECU sub-assembly LH	Refer to REMOVAL [06/2018 - 09/2022]
Right low beam headlight and high beam headlight do not illuminate	Headlight ECU sub-assembly RH	Refer to REMOVAL [06/2018 - 09/2022]
Left low beam headlight and high beam headlight flicker	Headlight ECU sub-assembly LH	Refer to REMOVAL [06/2018 - 09/2022]
Right low beam headlight and high beam headlight flicker	Headlight ECU sub-assembly RH	Refer to REMOVAL [06/2018 - 09/2022]

PARKING LIGHT

Symptom	Suspected Area	Link
Left parking light does not illuminate	Parking light circuit	Refer to Parking Light Circuit [06/2018 - 09/2022]
Left parking light does not illuminate	Headlight ECU sub-assembly LH	Refer to REMOVAL [06/2018 - 09/2022]
Right parking light does not illuminate	Parking light circuit	Refer to Parking Light Circuit [06/2018 - 09/2022]
Right parking light does not illuminate	Headlight ECU sub-assembly RH	Refer to REMOVAL [06/2018 - 09/2022]
Both left and right parking lights do not illuminate	Headlight dimmer switch circuit	Refer to Headlight Dimmer Switch Circuit [06/2018 - 01/2019]
Both left and right parking lights do not illuminate	Main body ECU (Multiplex network body ECU)	Refer to REMOVAL [06/2018 - 01/2019]
Left parking light flicker	Headlight ECU sub-assembly LH	Refer to REMOVAL [06/2018 - 09/2022]
Right parking light flicker	Headlight ECU sub-assembly RH	Refer to REMOVAL [06/2018 - 09/2022]

DAYTIME RUNNING LIGHT

Symptom	Suspected Area	Link
Left daytime running light does not illuminate	Daytime running light circuit	Refer to Daytime Running Light Circuit [06/2018 - 09/2022]
Left daytime running light does not illuminate	Headlight ECU sub-assembly LH	Refer to REMOVAL [06/2018 - 09/2022]
Right daytime running light does not illuminate	Daytime running light circuit	Refer to Daytime Running Light Circuit [06/2018 - 09/2022]
Right daytime running light does not illuminate	Headlight ECU sub-assembly RH	Refer to REMOVAL [06/2018 - 09/2022]
Both left and right daytime running lights do not illuminate	Check customize settings	Refer to CUSTOMIZE PARAMETERS [06/2018 - 09/2022]
	Headlight dimmer switch circuit	Refer to Headlight Dimmer Switch Circuit [06/2018 - 01/2019]
	Main body ECU (Multiplex network body ECU)	Refer to REMOVAL [06/2018 - 01/2019]
Left daytime running light flicker	Headlight ECU sub-assembly LH	Refer to REMOVAL [06/2018 - 09/2022]
Right daytime running light flicker	Headlight ECU sub-assembly RH	Refer to REMOVAL [06/2018 - 09/2022]

FRONT SIDE MARKER LIGHT

Symptom	Suspected Area	Link
Left front side marker light does not illuminate	Front side marker light bulb	Refer to REPLACEMENT [06/2018 - ]
Left front side marker light does not illuminate	Harness or connector	-
Right front side marker light does not illuminate	Front side marker light bulb	Refer to REPLACEMENT [06/2018 - ]
Right front side marker light does not illuminate	Harness or connector	-
Both left and right front side marker lights do not illuminate	Taillight relay circuit	Refer to Taillight Relay Circuit [06/2018 - 01/2019]
	Harness or connector	-

TAILLIGHT

Symptom	Suspected Area	Link
Left or right taillight (rear combination light assembly) does not illuminate	Rear combination light lens and body	Refer to INSPECTION [06/2018 - 09/2022]
	Rear combination light cord	Refer to DISASSEMBLY [06/2018 - ]
	Harness or connector	-
Left or right taillight (rear light assembly) does not illuminate	Rear light lens and body	Refer to INSPECTION [06/2018 - ]
	Rear light socket and wire	Refer to DISASSEMBLY [06/2018 - ]
	Harness or connector	-
All of the taillights, license plate lights and rear side marker lights do not illuminate	Headlight dimmer switch circuit	Refer to Headlight Dimmer Switch Circuit [06/2018 - 01/2019]
	Taillight relay circuit	Refer to Taillight Relay Circuit [06/2018 - 01/2019]
	Main body ECU (Multiplex network body ECU)	Refer to REMOVAL [06/2018 - 01/2019]

REAR SIDE MARKER LIGHT

Symptom	Suspected Area	Link
Left or right rear side marker light does not illuminate	Rear combination light lens and body	Refer to INSPECTION [06/2018 - 09/2022]

LICENSE PLATE LIGHT

Symptom	Suspected Area	Link
Left or right license plate light does not illuminate	License plate light bulb	Refer to REPLACEMENT [06/2018 - ]
	Harness or connector	-
	License plate light assembly	Refer to REMOVAL [06/2018 - ]
Both left and right license plate lights do not illuminate	Taillight relay circuit	Refer to Taillight Relay Circuit [06/2018 - 01/2019]
Both left and right license plate lights do not illuminate	Harness or connector	-

STOP LIGHT

Symptom	Suspected Area	Link
Left or right stop light does not illuminate	Rear combination light LED	Refer to INSPECTION [06/2018 - 09/2022]
	Rear combination light cord	Refer to DISASSEMBLY [06/2018 - ]
	Harness or connector	-
All of the stop lights do not illuminate	STOP fuse	-
	Stop light switch assembly	Refer to ON-VEHICLE INSPECTION [06/2018 - 01/2019]
	Harness or connector	-

HIGH MOUNTED STOP LIGHT

Symptom	Suspected Area	Link
High mounted stop light does not illuminate	Center stop light assembly	Refer to INSPECTION [06/2018 - ]
High mounted stop light does not illuminate	Harness or connector	-

FRONT FOG LIGHT

Symptom	Suspected Area	Link
Left or right front fog light does not illuminate	Fog light assembly	Refer to INSPECTION [06/2018 - 09/2022]
Left or right front fog light does not illuminate	Harness or connector	-
Both left and right front fog lights do not illuminate (taillights are normal)	Headlight dimmer switch circuit	Refer to Headlight Dimmer Switch Circuit [06/2018 - 01/2019]
	Front fog light circuit	Refer to Front Fog Light Circuit [06/2018 - 09/2022]
	Main body ECU (Multiplex network body ECU)	Refer to REMOVAL [06/2018 - 01/2019]

BACK-UP LIGHT

Symptom	Suspected Area	Link
Left or right back-up light does not illuminate	Rear light LED	Refer to INSPECTION [06/2018 - ]
	Rear light socket and wire	Refer to DISASSEMBLY [06/2018 - ]
	Harness or connector	-
Both left and right back-up lights do not illuminate	BKUP LP fuse	-
	ECU-ACC fuse*1	-
	Park/neutral position switch assembly*1	Refer to INSPECTION [06/2018 - 09/2024]
	Back-up light switch assembly*2	Refer to INSPECTION [06/2018 - 11/2022]
	Instrument panel junction block assembly	Refer to REMOVAL [06/2018 - 01/2019]
	Harness or connector	-

*1: for CVT
*2: for Manual Transaxle

TURN SIGNAL LIGHT

Symptom	Suspected Area	Link
Left or right front turn signal light does not operate	Headlight ECU sub-assembly	Refer to REMOVAL [06/2018 - 09/2022]
	Headlight unit assembly	Refer to DISASSEMBLY [06/2018 - 01/2019]
	Harness or connector	-
Left or right rear turn signal light does not operate	Rear combination light LED	Refer to INSPECTION [06/2018 - 09/2022]
	Rear combination light cord	Refer to DISASSEMBLY [06/2018 - ]
	Harness or connector	-
Left or right side turn signal light does not operate	Side turn signal light assembly	Refer to INSPECTION [06/2018 - ]
	Outer rear view mirror assembly	Refer to REMOVAL [06/2018 - ]
	Harness or connector	-
Turn signal lights do not operate in one direction	Turn signal switch circuit	Refer to Turn Signal Switch Circuit [06/2018 - 09/2022]
Turn signal lights do not operate in one direction	Meter/gauge system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - 09/2022]
All turn signal lights do not operate	Turn signal switch circuit	Refer to Turn Signal Switch Circuit [06/2018 - 09/2022]
All turn signal lights do not operate	Combination meter assembly	Refer to REMOVAL [06/2018 - 01/2019]
All turn signal lights do not flash at the correct speed	Combination meter assembly	Refer to REMOVAL [06/2018 - 01/2019]

HAZARD WARNING SIGNAL LIGHT

Symptom	Suspected Area	Link
Hazard warning signal lights do not operate	Hazard warning switch circuit	Refer to Hazard Warning Switch Circuit [06/2018 - 09/2022]
Hazard warning signal lights do not operate	Combination meter assembly	Refer to REMOVAL [06/2018 - 01/2019]

AUTOMATIC LIGHT CONTROL SYSTEM

Symptom	Suspected Area	Link
Automatic light control system does not operate	Headlight dimmer switch circuit	Refer to Headlight Dimmer Switch Circuit [06/2018 - 01/2019]
Automatic light control system does not operate	Main body ECU (Multiplex network body ECU)	Refer to REMOVAL [06/2018 - 01/2019]

LIGHT AUTO TURN-OFF SYSTEM

Symptom	Suspected Area	Link
Light auto turn-off system does not operate	Headlight dimmer switch circuit	Refer to Headlight Dimmer Switch Circuit [06/2018 - 01/2019]
	IG signal circuit	Refer to IG Signal Circuit [06/2018 - 01/2019]
	Front door courtesy switch circuit	Refer to Front Door Courtesy Switch Circuit [06/2018 - 01/2019]
	Main body ECU (Multiplex network body ECU)	Refer to REMOVAL [06/2018 - 01/2019]

REMOTE OPERATION FUNCTION (W/ TELEMATICS SYSTEM)

Symptom	Suspected Area	Link
Lights do not operate using remote operation function (Lighting system is normal)	Telematics system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - 09/2019]

WIPER-LINKED LOW BEAM HEADLIGHT CONTROL SYSTEM

Symptom	Suspected Area	Link
Wiper-linked low beam headlight control system does not operate	Check customize settings	Refer to CUSTOMIZE PARAMETERS [06/2018 - 09/2022]
	Main body ECU (Multiplex network body ECU)	Refer to REMOVAL [06/2018 - 01/2019]

AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM

Symptom	Suspected Area	Link
Automatic headlight beam level control system does not operate (Left Headlight)	Headlight ECU sub-assembly LH	Refer to REMOVAL [06/2018 - 09/2022]
	Headlight unit assembly LH	Refer to DISASSEMBLY [06/2018 - 01/2019]
Automatic headlight beam level control system does not operate (Right Headlight)	Headlight ECU sub-assembly RH	Refer to REMOVAL [06/2018 - 09/2022]
	Headlight unit assembly RH	Refer to DISASSEMBLY [06/2018 - 01/2019]
Initialization cannot be performed	CAN communication system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - 09/2022]
Initialization cannot be performed	Headlight ECU sub-assembly LH	Refer to REMOVAL [06/2018 - 09/2022]

AFS

Symptom	Suspected Area	Link
AFS control does not operate (Left Headlight)	Headlight ECU sub-assembly LH	Refer to REMOVAL [06/2018 - 09/2022]
AFS control does not operate (Left Headlight)	Headlight unit assembly LH	Refer to DISASSEMBLY [06/2018 - 01/2019]
AFS control does not operate (Right Headlight)	Headlight ECU sub-assembly RH	Refer to REMOVAL [06/2018 - 09/2022]
AFS control does not operate (Right Headlight)	Headlight unit assembly RH	Refer to DISASSEMBLY [06/2018 - 01/2019]

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)	Front radar sensor system	Refer to Automatic High Beam System does not Operate or Operation Indicator does not Illuminate [06/2018 - 09/2022]
	Check Data List (Front Recognition Camera High Temperature 2)
	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"	Refer to Automatic High Beam Switch Indicator does not Come ON [06/2018 - 09/2022]