LIGHTING SYSTEM PROBLEM SYMPTOMS TABLE

Note

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.

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Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.
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.
When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.
If the forward recognition camera has been replaced with a new one, be sure to perform Forward Recognition Camera Learning.

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Headlight
Symptom	Suspected Area	Link
Left low beam headlight does not illuminate	Headlight unit LH	Click here
	Headlight housing sub-assembly LH (wire harness)	Click here
	Headlight ECU sub-assembly LH	Click here
Right low beam headlight does not illuminate	Headlight unit RH	Click here
	Headlight housing sub-assembly RH (wire harness)	Click here
	Headlight ECU sub-assembly RH	Click here
Both left and right low beam headlights do not illuminate	Headlight dimmer switch circuit	Click here
Both left and right low beam headlights do not illuminate	Main body ECU (Multiplex network body ECU)	Click here
Left high beam headlight does not illuminate (w/o Adaptive High Beam System)	High beam headlight circuit	Click here
	Headlight ECU sub-assembly LH	Click here
Right high beam headlight does not illuminate (w/o Adaptive High Beam System)	High beam headlight circuit	Click here
	Headlight ECU sub-assembly RH	Click here
Left high beam headlight does not illuminate (w/ Adaptive High Beam System)	Headlight ECU sub-assembly LH	Click here
Right high beam headlight does not illuminate (w/ Adaptive High Beam System)	Headlight ECU sub-assembly RH	Click here
Both left and right high beam headlights do not illuminate	Headlight dimmer switch circuit	Click here
Both left and right high beam headlights do not illuminate	Main body ECU (Multiplex network body ECU)	Click here
High Flash (passing function) does not operate (high beam headlights are normal)	Headlight dimmer switch circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here
Left low beam headlight and high beam headlight do not illuminate	Headlight ECU sub-assembly LH	Click here
Right low beam headlight and high beam headlight do not illuminate	Headlight ECU sub-assembly RH	Click here

Clearance Light/Daytime Running Light
Symptom	Suspected Area	Link
Left clearance light/daytime running light does not illuminate	Clearance Light/Daytime running light circuit	Click here
	Headlight ECU sub-assembly LH	Click here
Right clearance light/daytime running light does not illuminate	Clearance Light/Daytime running light circuit	Click here
	Headlight ECU sub-assembly RH	Click here
Both left and right clearance lights does not illuminate	Headlight dimmer switch circuit	Click here
Both left and right clearance lights does not illuminate	Main body ECU (Multiplex network body ECU)	Click here
Both left and right daytime running lights does not illuminate	Check customize settings	Click here
	Headlight dimmer switch circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here

Taillight, License Plate Light
Symptom	Suspected Area	Link
Left tailight (rear light assembly) does not illuminate.	Rear light lens and body LH	Click here
	Rear light LED LH	Click here
	Harness or connector	-
Right tailight (rear light assembly) does not illuminate.	Rear light lens and body RH	Click here
	Rear light LED RH	Click here
	Harness or connector	-
Left stop light (rear combination light assembly [for zone A]) does not illuminate.	Rear combination light lens and body LH	Click here
	Rear combination light LED LH	Click here
	Harness or connector	-
Right stop light (rear combination light assembly [for zone A]) does not illuminate.	Rear combination light lens and body RH	Click here
	Rear combination light LED RH	Click here
	Harness or connector	-
Left stop light (rear combination light assembly [for zone B]) does not illuminate.	Rear combination light lens and body LH	Click here
	Harness or connector	-
Right stop light (rear combination light assembly [for zone B]) does not illuminate.	Rear combination light lens and body RH	Click here
	Harness or connector	-
License plate light does not illuminate	License plate light assembly	Click here
License plate light does not illuminate	Harness or connector	-
All of the taillights and license plate lights do not illuminate	Headlight dimmer switch circuit	Click here
	Taillight circuit	Click here
All of the taillights (rear combination light assembly) and rear side marker lights does not illuminate	Taillight circuit	Click here
All of the taillights (rear light assembly) and license plate lights does not illuminate	Taillight circuit	Click here

Stop Light, Center Stop Light
Symptom	Suspected Area	Link
All stop light does not illuminate.	Stop light circuit	Click here
Left stop light (rear light assembly) does not illuminate.	Rear light lens and body LH	Click here
	Rear light LED LH	Click here
	Harness or connector	-
Right stop light (rear light assembly) does not illuminate.	Rear light lens and body RH	Click here
	Rear light LED RH	Click here
	Harness or connector	-
Left stop light (rear combination light assembly [for zone A]) does not illuminate.	Rear combination light lens and body LH	Click here
	Rear combination light LED LH	Click here
	Harness or connector	-
Right stop light (rear combination light assembly [for zone A]) does not illuminate.	Rear combination light lens and body RH	Click here
	Rear combination light LED RH	Click here
	Harness or connector	-
Left stop light (rear combination light assembly [for zone B]) does not illuminate.	Rear combination light lens and body LH	Click here
	Harness or connector	-
Right stop light (rear combination light assembly [for zone B]) does not illuminate.	Rear combination light lens and body RH	Click here
	Harness or connector	-
Center stop light does not illuminate.	Center stop light assembly	Click here
	Center stop light wire	Click here
	Harness or connector	-

Back-up Light
Symptom	Suspected Area	Link
All back-up lights do not illuminate.	Back-up light circuit	Click here
Left back-up lights do not illuminate.	Rear light lens and body LH	Click here
Left back-up lights do not illuminate.	Harness or connector	-
Right back-up lights do not illuminate.	Rear light lens and body RH	Click here
Right back-up lights do not illuminate.	Harness or connector	-

Rear Fog Light (w/ Rear Fog Light)
Symptom	Suspected Area	Link
Left rear fog light does not illuminate	Rear light lens and body LH	Click here
	Harness or connector	-
	No. 3 semiconductor power integration ECU	Click here
Right rear fog light does not illuminate	Rear light lens and body RH	Click here
	Harness or connector	-
	No. 3 semiconductor power integration ECU	Click here
Both left and right rear fog light does not illuminate	Headlight dimmer switch circuit	Click here
Both left and right rear fog light does not illuminate	Rear fog light circuit	Click here

Turn Signal Light
Symptom	Suspected Area	Link
Front turn and side turn signal lights do not operate in one direction.	Meter/gauge system	Click here
Rear side turn signal lights do not operate in one direction.	Meter/gauge system	Click here
All turn signal lights do not operate.	Turn signal switch circuit	Click here
All turn signal lights do not operate.	Combination meter assembly	Click here
Turn signal lights do not operate in one direction.	Turn signal switch circuit	Click here
Turn signal lights do not operate in one direction.	Combination meter assembly	Click here
Left front turn signal light does not operate.	Meter/gauge system	Click here
	Headlight housing sub-assembly LH (wire harness)	Click here
	No. 1 headlight clearance LED unit LH	Click here
	Headlight ECU sub-assembly LH	Click here
Right front turn signal light does not operate.	Meter/gauge system	Click here
	Headlight housing sub-assembly RH (wire harness)	Click here
	No. 1 headlight clearance LED unit RH	Click here
	Headlight ECU sub-assembly RH	Click here
Left rear turn signal light (rear combination light assembly) does not operate.	Meter/gauge system	Click here
	Rear combination light lens and body LH	Click here
	Harness or connector	-
Right rear turn signal light (rear combination light assembly) does not operate.	Meter/gauge system	Click here
	Rear combination light lens and body RH	Click here
	Harness or connector	-
Left rear turn signal light (rear light assembly) does not operate.	Meter/gauge system	Click here
	Rear light lens and body LH	Click here
	Harness or connector	-
Right rear turn signal light (rear light assembly) does not operate.	Meter/gauge system	Click here
	Rear light lens and body RH	Click here
	Harness or connector	-
Left side turn signal light does not operate.	Meter/gauge system	Click here
	Side turn signal light assembly LH	Click here
	Outer mirror actuator assembly LH	Click here
	Front multiplex network door ECU LH	Click here
	Harness or connector	-
Right side turn signal light does not operate.	Meter/gauge system	Click here
	Side turn signal light assembly RH	Click here
	Outer mirror actuator assembly RH	Click here
	Front multiplex network door ECU RH	Click here
	Harness or connector	-
Turn signal lights do not operate in one direction	Turn signal switch circuit	Click here
Turn signal lights do not operate in one direction	Meter/gauge system	Click here
All turn signal lights do not flash at the correct speed.	Combination meter assembly	Click here

Hazard Warning Signal Light
Symptom	Suspected Area	Link
Hazard warning signal lights do not operate.	Hazard warning switch circuit	Click here
Hazard warning signal lights do not operate.	Combination meter assembly	Click here

Cornering Light
Symptom	Suspected Area	Link
Left cornering light does not illuminate.	Check operating conditions	Click here
	Headlight housing sub-assembly LH (wire harness)	Click here
	Headllight cornering LED unit LH	Click here
	Headlight ECU sub-assembly LH	Click here
Right cornering light does not illuminate.	Check operating conditions	Click here
	Headlight housing sub-assembly RH (wire harness)	Click here
	Headllight cornering LED unit RH	Click here
	Headlight ECU sub-assembly RH	Click here

Automatic Light Control System
Symptom	Suspected Area	Link
Automatic light control system does not operate.	Headlight dimmer switch circuit	Click here
Automatic light control system does not operate.	Main body ECU (multiplex network body ECU)	Click here

Light Auto Turn-off System
Symptom	Suspected Area	Link
Light auto turn-off system does not operate.	Headlight dimmer switch circuit	Click here
	IG signal circuit	Click here
	Door courtesy switch circuit	Click here
	Main body ECU (multiplex network body ECU)	Click here

Follow Me Home System (w/ Follow Me Home System)
Symptom	Suspected Area	Link
Follow me home system does not operate.	Check customize parameters (Follow Me Home Lighting Time)	Click here
Follow me home system does not operate.	Main body ECU (multiplex network body ECU)	Click here

Welcome Light Illumination Control
Symptom	Suspected Area	Link
Welcome light illumination control does not operate.	Check customize parameters (Light up Clearance Lights at Door Unlock Function)	Click here
Welcome light illumination control does not operate.	Main body ECU (multiplex network body ECU)	Click here

Outside Handle Light Control
Symptom	Suspected Area	Link
Outside handle lights do not illuminate.	Check customize parameters	Click here
	Exterior illumination circuit	Click here
	Main body ECU (multiplex network body ECU)	Click here

Automatic Headlight Beam Level Control System
Symptom	Suspected Area	Link
Automatic headlight beam level control system does not operate (Left Headlight)	Headlight housing sub-assembly LH (wire harness)	Click here
	Headlight leveling motor LH	Click here
	Headlight ECU sub-assembly LH	Click here
Automatic headlight beam level control system does not operate (Right Headlight)	Headlight housing sub-assembly RH (wire harness)	Click here
	Headlight leveling motor RH	Click here
	Headlight ECU sub-assembly RH	Click here
Initialization cannot be performed	CAN communication system	Click here
Initialization cannot be performed	Headlight ECU sub-assembly LH	Click here

Adaptive High Beam System (w/ Adaptive High Beam System)
Symptom	Suspected Area	Link
Adaptive high beam indicator on the combination meter assembly does not illuminate	Check operating conditions	Click here
	Meter / gauge system	Click here
	Adaptive high beam switch circuit	Click here
	Headlight dimmer switch circuit	Click here
	Combination meter assembly	Click here
	Forward recognition camera	Click here
	Headlight ECU sub-assembly LH	Click here
Adaptive high beam system does not operate	Customize settings	Click here
	Check operating conditions	Click here
	Check that the low beams and high beams operate manually	-
	Check automatic light control system operation	Click here
	Adaptive high beam switch circuit	Click here
	Headlight dimmer switch circuit	Click here
	Forward recognition camera	Click here
	Light control LED ECU	Click here
	Headlight ECU sub-assembly LH	Click here

Automatic High Beam System (w/o Adaptive 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 automatic high beam indicator light	Click here
	Check Data List (Auto H Beam STS)
	Check Active Test (Automatic High Beam Indicator)
	Check automatic high beam main switch
	Harness or connector
	Main body ECU (multiplex network body ECU)
	Combination meter assembly
	Forward recognition camera