LIGHTING SYSTEM(for Single Beam Headlight) PROBLEM SYMPTOMS TABLE

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 or right low beam headlight does not illuminate	H-LP LH-LO fuse or H-LP RH-LO fuse	-
	Headlight unit	Click here
	Headlight unit assembly	Click here
	Semiconductor pwr integration ECU	Click here
	Light control ECU	Click here
	Harness or connector	-
Both left and right low beam headlights do not illuminate	Headlight dimmer switch circuit	Click here
	Low beam headlight circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here
Left or right high beam headlight does not illuminate	Headlight unit	Click here
	Headlight unit assembly	Click here
	Semiconductor pwr integration ECU	Click here
	Light control ECU	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 or right clearance light does not illuminate	Clearance light assembly	Click here
	Clearance light LED unit assembly	Click here
	Harness or connector	-
Both left and right clearance lights do not illuminate	Harness or connector	-
Both left and right clearance lights do not illuminate	Instrument panel junction block assembly	Click here

Taillight
Symptom	Suspected Area	Link
Left or right taillight (rear combination light assembly) do not illuminate	Rear combination light lens and body	Click here
	Rear combination light socket and wire	Click here
	Harness or connector	-
Left or right taillight (rear light assembly) does not illuminate	Rear light lens and body	Click here
	Rear light socket and wire	Click here
	Harness or connector	-

License Plate Light
Symptom	Suspected Area	Link
Left or right license plate light does not illuminate	License plate light assembly	Click here
Left or right license plate light does not illuminate	Harness or connector	-
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 lens and body	Click here
	Rear combination light socket and wire	Click here
	Harness or connector	-
Center stop light does not illuminate	Center stop light assembly	Click here
Center stop light does not illuminate	Harness or connector	-
All of the stop lights do not illuminate	STOP fuse	-
	Stop light switch assembly	Click here
	Semiconductor pwr integration ECU	Click here
	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 cord	Click here
	Light control LED ECU	Click here
	Fog light assembly	Click here
	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 (taillights are normal)	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
Back-up light does not illuminate	Hybrid control system	Click here
	BKUP LP fuse	-
	BKUP LP relay	Click here
	Back-up light bulb	Click here
	Rear light socket and wire	Click here
	Instrument panel junction block assembly	Click here
	Hybrid vehicle control ECU assembly	Click here
	Harness or connector	-

Turn Signal Light
Symptom	Suspected Area	Link
Left or right turn signal light does not operate (except side turn signal lights)	Front turn signal light bulb	Click here
	Rear turn signal light bulb	Click here
	Headlight cord	Click here
	Rear combination light socket and wire	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	-
Turn signal lights do not operate in one direction	Turn signal switch circuit	Click here
	Windshield wiper switch assembly	Click here
	Meter / gauge system	Click here
All turn signal lights do not operate	Turn signal switch circuit	Click here
	Windshield wiper switch assembly	Click here
	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	Check DTCs	Click here
	Headlight dimmer switch circuit	Click here
	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

Daytime Running Light System
Symptom	Suspected Area	Link
Daytime running light system does not operate (both left and right daytime running lights do not illuminate)	CAN communication system	Click here
	Headlight dimmer switch circuit	Click here
	IG signal circuit	Click here
	Parking brake switch circuit	Click here
	Daytime running light relay circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here
Left or right daytime running light does not illuminate	Clearance light assembly	Click here
	Clearance light LED unit assembly	Click here
	Harness or connector	-

Outside Handle Foot Light Control
Symptom	Suspected Area	Link
Both left and right outside handle foot lights do not illuminate	CAN communication system	Click here
	Power door lock control system	Click here
	Wireless door lock control system	Click here
	Entry and start system (for Entry Function)	Click here
	Outside handle foot light circuit	Click here
	Door unlock detection switch circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here
Left or right outside handle foot light does not illuminate	Front door outside handle assembly	Click here
Left or right outside handle foot light does not illuminate	Harness or connector	-

Welcome Light Illumination Control
Symptom	Suspected Area	Link
Welcome light illumination control does not operate	Wireless door lock control system	Click here
	Headlight dimmer 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	IG signal circuit	Click here
	Headlight dimmer switch circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here