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

Note

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

*: 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
Symptom	Suspected Area	Link
Left low beam headlight does not illuminate	Refer to "LO-beam Headlight does not Illuminate"	Click here
Right low beam headlight does not illuminate	Refer to "LO-beam Headlight does not Illuminate"	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	Headlight unit assembly LH	Click here
	Headlight LED unit assembly LH	Click here
	Harness or connector	-
Right high beam headlight does not illuminate	Headlight unit assembly RH	Click here
	Headlight LED unit assembly RH	Click here
	Harness or connector	-
Both left and right high beam headlights do not illuminate	Headlight dimmer switch circuit	Click here
	High beam headlight circuit	Click here
	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

Clearance Light
Symptom	Suspected Area	Link
Left clearance light does not illuminate	No. 1 headlight clearance LED unit LH	Click here
	Headlight unit assembly LH	Click here
	Harness or connector	-
Right clearance light does not illuminate	No. 1 headlight clearance LED unit RH	Click here
	Headlight unit assembly RH	Click here
	Harness or connector	-
Both left and right clearance lights do not illuminate	Taillight relay circuit	Click here
Both left and right clearance lights do not illuminate	Harness or connector	-

Daytime Running Light
Symptom	Suspected Area	Link
Left daytime running light does not illuminate	No. 1 headlight clearance LED unit LH	Click here
	Headlight unit assembly LH	Click here
	Harness or connector	-
Right daytime running light does not illuminate	No. 1 headlight clearance LED unit RH	Click here
	Headlight unit assembly RH	Click here
	Harness or connector	-
Both left and right daytime running lights do not illuminate	Daytime running light circuit	Click here
	Headlight dimmer switch circuit	Click here
	IG signal circuit	Click here
	CAN communication system	Click here
	Main body ECU (Multiplex network body ECU)	Click here

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

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	Rear combination light LED	Click here
	Rear combination light socket and wire	Click here
	Harness or connector	-
All of the stop lights do not illuminate	STOP fuse	-
	Stop light switch assembly	Click here
	Harness or connector	-

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
Symptom	Suspected Area	Link
Rear fog light does not illuminate	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

Back-up Light
Symptom	Suspected Area	Link
Left or right back-up light does not illuminate	Back-up light bulb	Click here
	Rear light socket and wire	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*1	Click here
	Park/neutral position switch assembly*2	Click here
	Instrument panel junction block assembly	Click here
	Harness or connector	-

*1: for UB80E
*2: for U760E

Turn Signal Light
Symptom	Suspected Area	Link
Left or right front turn signal light does not operate	Front turn signal light bulb	Click here
	Front turn signal light socket	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
	Harness or connector	-
Left or right rear turn signal light does not operate	Rear turn signal light bulb	Click here
	Rear combination light socket and wire	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

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