LIGHTING SYSTEM(w/ Automatic Headlight Beam Level Control System) PROBLEM SYMPTOMS TABLE

Note

The vehicle battery supplies power to the main body ECU (multiplex network body ECU) via the door control battery. Therefore, before performing troubleshooting, make sure to perform an on-vehicle inspection to confirm that the main body ECU (multiplex network body ECU) power source circuit is normal.*1

Click here
Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.*2
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.

Click here

*1: w/ Door Control Battery
*2: w/ Smart Entry and Start System

Tech Tips

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 (for Bulb Type Turn Signal Light)
Symptom	Suspected Area	Link
Left low beam headlight does not illuminate	Headlight unit assembly	Click here
	Headlight LED unit assembly	Click here
	Headlight ECU sub-assembly LH	Click here
Right low beam headlight does not illuminate	Headlight unit assembly	Click here
	Headlight LED unit assembly	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	High beam headlight circuit	Click here
Left high beam headlight does not illuminate	Headlight ECU sub-assembly LH	Click here
Right high beam headlight does not illuminate	High beam headlight circuit	Click here
Right high beam headlight does not illuminate	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

Headlight (for LED Type Turn Signal Light)
Symptom	Suspected Area	Link
Left low beam headlight does not illuminate	Headlight unit assembly	Click here
	Headlight unit	Click here
	Headlight ECU sub-assembly LH	Click here
Right low beam headlight does not illuminate	Headlight unit assembly	Click here
	Headlight unit	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	High beam headlight circuit	Click here
Left high beam headlight does not illuminate	Headlight ECU sub-assembly LH	Click here
Right high beam headlight does not illuminate	High beam headlight circuit	Click here
Right high beam headlight does not illuminate	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 do not illuminate	Headlight dimmer switch circuit	Click here
Both left and right clearance lights do not illuminate	Main body ECU (Multiplex network body ECU)	Click here
Both left and right daytime running lights do not illuminate	Headlight dimmer switch circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here

Taillight
Symptom	Suspected Area	Link
Left or right taillight (rear combination light assembly) does not illuminate*1	Rear combination light lens and body	Click here
	Rear combination light socket and wire	Click here
	Harness or connector	-
Left or right taillight (rear combination light assembly) does not illuminate*2	Rear combination light LED	Click here
	Rear combination light socket and wire	Click here
	Harness or connector	-
Left or right taillight (rear combination light assembly) does not illuminate*3	Rear combination light assembly	Click here
	Rear combination light cord	Click here
	Harness or connector	-
Left or right taillight (rear light assembly) does not illuminate*1	Rear light lens and body	Click here
	Rear light socket and wire	Click here
	Harness or connector	-
Left or right taillight (rear light assembly) does not illuminate*3	Rear light assembly	Click here
	Rear light cord	Click here
	Harness or connector	-
All of the taillights, license plate lights and rear side marker lights do not illuminate	Headlight dimmer switch circuit	Click here
	Taillight relay circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here

*1: for Bulb Type Back-up Light with Rear Side Marker Light
*2: for Bulb Type Back-up Light without Rear Side Marker Light
*3: for LED Type Back-up Light

Rear Side Marker Light (w/ Rear Side Marker Light)
Symptom	Suspected Area	Link
Left or right rear side marker light does not illuminate	Rear combination light lens and body*1	Click here
Left or right rear side marker light does not illuminate	Rear combination light assembly*2	Click here

*1: for Bulb Type Back-up Light
*2: for LED Type Back-up Light

License Plate Light
Symptom	Suspected Area	Link
License plate light does not illuminate	License plate light assembly	Click here
License plate light does not illuminate	Harness or connector	-

Stop Light
Symptom	Suspected Area	Link
Left or right stop light does not illuminate*1	Rear combination light LED	Click here
	Rear combination light socket and wire	Click here
	Harness or connector	-
Left or right stop light does not illuminate*2	Rear combination light assembly	Click here
	Rear combination light cord	Click here
	Harness or connector	-
All of the stop lights do not illuminate	STOP fuse	-
	Stop light switch assembly	Click here
	Harness or connector	-

*1: for Bulb Type Back-up Light
*2: for LED Type Back-up Light

High Mounted Stop Light
Symptom	Suspected Area	Link
High mounted stop light does not illuminate	Center stop light set	Click here
High mounted stop light does not illuminate	Harness or connector	-

Front Fog Light (w/ Front Fog Light)
Symptom	Suspected Area	Link
Left or right front fog light does not illuminate	Fog light assembly	Click here
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	Click here
	Front fog light circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here

Rear Fog Light (w/ Rear Fog Light)
Symptom	Suspected Area	Link
Rear fog light does not illuminate*1	Rear light lens and body	Click here
	Rear light socket and wire	Click here
	Headlight dimmer switch circuit	Click here
	Rear fog light circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here
Rear fog light does not illuminate*2	Rear light assembly	Click here
	Rear light cord	Click here
	Headlight dimmer switch circuit	Click here
	Rear fog light circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here

*1: for Bulb Type Back-up Light
*2: for LED Type Back-up Light

Back-up Light
Symptom	Suspected Area	Link
Left or right back-up light does not illuminate*1	Back-up light bulb	Click here
	Rear light socket and wire	Click here
	Harness or connector	-
Left or right back-up light does not illuminate*2	Rear light assembly	Click here
	Rear light cord	Click here
	Harness or connector	-
Both left and right back-up lights do not illuminate	BKUP LP fuse	-
	ECU-ACC fuse	-
	Park/neutral position switch assembly*3	Click here
	Park/neutral position switch assembly*4	Click here
	Park/neutral position switch assembly*5	Click here
	Instrument panel junction block assembly	Click here
	Harness or connector	-

*1: for Bulb Type Back-up Light
*2: for LED Type Back-up Light
*3: for UA80E
*4: for UB80E
*5: for U760E

Turn Signal Light
Symptom	Suspected Area	Link
Left or right front turn signal light does not operate*1	Front turn signal light bulb	Click here
	Headlight unit assembly	Click here
	Headlight ECU sub-assembly	Click here
	Harness or connector	-
Left or right front turn signal light does not operate*2	Headlight lens	Click here
	Headlight unit assembly	Click here
	Headlight ECU sub-assembly	Click here
	Harness or connector	-
Left or right side turn signal light does not operate	Side turn signal light assembly	Click here
	Outer rear view mirror assembly	Click here
	Outer mirror control ECU assembly*3	Click here
	Harness or connector	-
Left or right rear turn signal light does not operate*4	Rear turn signal light bulb	Click here
	Rear combination light socket and wire	Click here
	Harness or connector	-
Left or right rear turn signal light does not operate*5	Rear combination light assembly	Click here
	Rear combination light cord	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 operate	Turn signal switch circuit	Click here
All turn signal lights do not operate	Combination meter assembly	Click here
All turn signal lights do not flash at the correct speed	Combination meter assembly	Click here

*1: for Bulb Type Turn Signal Light
*2: for LED Type Turn Signal Light
*3: w/ Memory
*4: for Bulb Type Back-up Light
*5: for LED Type Back-up Light

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

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
	Front door courtesy switch 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 beam level control actuator circuit	Click here
	Headlight ECU sub-assembly LH	Click here
Automatic headlight beam level control system does not operate (Right Headlight)	Headlight beam level control actuator circuit	Click here
	Headlight ECU sub-assembly RH	Click here
Both left and right automatic headlight beam level control system does not operate	Headlight ECU sub-assembly LH	Click here
Initialization cannot be performed	CAN communication system	Click here
Initialization cannot be performed	Headlight ECU sub-assembly LH	Click here

Automatic High Beam System (w/ 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 automatic high beam indicator light	Click here
	Check Data List (Auto H Beam STS0)
	Perform Active Test (Automatic High Beam Indicator (Green))*1
	Perform Active Test (Multi Display All (White))*2
	Auto high beam switch
	Harness or connector
Auto high beam switch indicator does not come ON	Refer to "Automatic High Beam Switch Indicator does not Come ON"	Click here

*1: for Multi-information Display (4.2 Inch Display)
*2: for Multi-information Display (7 Inch Display)