LIGHTING SYSTEM PROBLEM SYMPTOMS TABLE

Note

Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.*1

*1: w/ Entry and Start System
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.*2

Click here

*2: for LED Headlight
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.

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*1	Headlight unit assembly LH	Click here
Left low beam headlight does not illuminate*1	Headlight ECU sub-assembly LH	Click here
Left low beam headlight does not illuminate*2	No. 1 headlight bulb	Click here
Left low beam headlight does not illuminate*2	Harness or connector	-
Right low beam headlight does not illuminate*1	Headlight unit assembly RH	Click here
Right low beam headlight does not illuminate*1	Headlight ECU sub-assembly RH	Click here
Right low beam headlight does not illuminate*2	No. 1 headlight bulb	Click here
Right low beam headlight does not illuminate*2	Harness or connector	-
Both left and right low beam headlights do not illuminate*1	Headlight dimmer switch circuit	Click here
	Main body ECU (Multiplex network body ECU) (for LHD)	Click here
	Main body ECU (Multiplex network body ECU) (for RHD)	Click here
Both left and right low beam headlights do not illuminate*2	Headlight dimmer switch circuit	Click here
	Low beam headlight circuit	Click here
	Main body ECU (Multiplex network body ECU) (for LHD)	Click here
	Main body ECU (Multiplex network body ECU) (for RHD)	Click here
Left high beam headlight does not illuminate*1	High beam headlight circuit	Click here
	Headlight unit assembly LH	Click here
	Headlight ECU sub-assembly LH	Click here
Left high beam headlight does not illuminate*2	Headlight unit assembly LH	Click here
Left high beam headlight does not illuminate*2	Harness or connector	-
Right high beam headlight does not illuminate*1	High beam headlight circuit	Click here
	Headlight unit assembly RH	Click here
	Headlight ECU sub-assembly RH	Click here
Right high beam headlight does not illuminate*2	Headlight unit assembly RH	Click here
Right high beam headlight does not illuminate*2	Harness or connector	-
Both left and right high beam headlights do not illuminate*1	Headlight dimmer switch circuit	Click here
	Main body ECU (Multiplex network body ECU) (for LHD)	Click here
	Main body ECU (Multiplex network body ECU) (for RHD)	Click here
Both left and right high beam headlights do not illuminate*2	Headlight dimmer switch circuit	Click here
	High beam headlight circuit	Click here
	Main body ECU (Multiplex network body ECU) (for LHD)	Click here
	Main body ECU (Multiplex network body ECU) (for RHD)	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) (for LHD)	Click here
	Main body ECU (Multiplex network body ECU) (for RHD)	Click here
Left low beam headlight, high beam headlight, daytime running light and clearance light do not illuminate*1	Power source circuit	Click here
	Headlight ECU sub-assembly LH	Click here
Right low beam headlight, high beam headlight, daytime running light and clearance light do not illuminate*1	Power source circuit	Click here
	Headlight ECU sub-assembly RH	Click here

*1: for LED Headlight
*2: for Halogen Headlight

Clearance Light/Daytime Running Light
Symptom	Suspected Area	Link
Left clearance light/daytime running light does not illuminate*1	Clearance Light/Daytime running light circuit	Click here
	Headlight ECU sub-assembly LH	Click here
Left clearance light/daytime running light does not illuminate*2	Headlight unit assembly LH	Click here
	Harness or connector	-
Right clearance light/daytime running light does not illuminate*1	Clearance Light/Daytime running light circuit	Click here
	Headlight ECU sub-assembly RH	Click here
Right clearance light/daytime running light does not illuminate*2	Headlight unit assembly RH	Click here
	Harness or connector	-
	Electric parking brake system	Click here
Both left and right clearance lights do not illuminate*1	Electric parking brake system	Click here
	Headlight dimmer switch circuit	Click here
	Main body ECU (Multiplex network body ECU) (for LHD)	Click here
	Main body ECU (Multiplex network body ECU) (for RHD)	Click here
Both left and right clearance lights do not illuminate*2	Electric parking brake system	Click here
	Headlight dimmer switch circuit	Click here
	Daytime running light relay circuit	Click here
	Main body ECU (Multiplex network body ECU) (for LHD)	Click here
	Main body ECU (Multiplex network body ECU) (for RHD)	Click here

*1: for LED Headlight
*2: for Halogen Headlight

Taillight
Symptom	Suspected Area	Link
Left or right taillight (rear combination light assembly) do not illuminate*1	Rear combination light assembly	Click here
	Harness or connector	-
Left or right taillight (rear combination light assembly) do not illuminate*2	Rear combination light socket and wire	Click here
	Rear combination light LED	Click here
	Harness or connector	-
Left or right taillight (rear light assembly) does not illuminate*1	Rear light assembly	Click here
	Harness or connector	-
All of the taillights 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) (for LHD)	Click here
	Main body ECU (Multiplex network body ECU) (for RHD)	Click here

*1: for LED Headlight
*2: for Halogen Headlight

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	-

Stop Light
Symptom	Suspected Area	Link
Left or right stop light (rear combination light assembly) does not illuminate*1	Rear combination light assembly	Click here
	Harness or connector	-
Left or right stop light (rear combination light assembly) does not illuminate*2	Rear combination light socket and wire	Click here
	Rear combination light LED	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
	Harness or connector	-

*1: for LED Headlight
*2: for Halogen Headlight

Front Fog Light (w/ Front Fog Light)
Symptom	Suspected Area	Link
Left or right front fog light does not illuminate*1	Fog light assembly	Click here
Left or right front fog light does not illuminate*1	Harness or connector	-
Left or right front fog light does not illuminate*2	Fog light bulb	Click here
Left or right front fog light does not illuminate*2	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) (for LHD)	Click here
	Main body ECU (Multiplex network body ECU) (for RHD)	Click here

*1: for LED Type
*2: for Bulb Type

Rear Fog Light (w/ Rear Fog Light)
Symptom	Suspected Area	Link
Rear fog light does not illuminate (taillights are normal)	Headlight dimmer switch circuit	Click here
	Rear fog light circuit	Click here
	Main body ECU (Multiplex network body ECU) (for LHD)	Click here
	Main body ECU (Multiplex network body ECU) (for RHD)	Click here

Back-up Light
Symptom	Suspected Area	Link
Left or right back-up light does not illuminate*1	Rear light assembly	Click here
Left or right back-up light does not illuminate*1	Harness or connector	-
Left or right back-up light does not illuminate*2	Back-up light bulb	Click here
	Back up light socket	Click here
	Harness or connector	-
Both left and right back-up lights do not illuminate	Park/neutral position switch assembly (for K114 CVT)	Click here
	Park/neutral position switch assembly (for K313 CVT)	Click here
	Park/neutral position switch assembly (for K313F CVT)	Click here
	Back-up Light switch assembly (for EC6A Manual Transaxle)	Click here
	Back-up Light switch assembly (for EC69 Manual Transaxle)	Click here
	Instrument panel junction block assembly (for LHD)	Click here
	Instrument panel junction block assembly (for RHD)	Click here
	Harness or connector	-

*1: for LED Headlight
*2: for Halogen Headlight

Turn Signal Light
Symptom	Suspected Area	Link
Left or right front turn signal light does not operate*1	Meter/gauge system	Click here
	Headlight unit assembly LH	Click here
	Headlight ECU sub-assembly LH	Click here
	Harness or connector	-
Left or right front turn signal light does not operate*2	Meter/gauge system	Click here
	Front turn signal light bulb	Click here
	Front turn signal light socket	Click here
	Harness or connector	-
Left or right rear turn signal light does not operate*1	Meter/gauge system	Click here
	Rear combination light assembly	Click here
	Harness or connector	-
Left or right rear turn signal light does not operate*2	Meter/gauge system	Click here
	Rear combination light socket and wire	Click here
	Rear turn signal light bulb	Click here
	Harness or connector	-
Left or right side turn signal light does not operate*3	Side turn signal light assembly	Click here
	Outer rear view mirror assembly	Click here
	Harness or connector	-
Left or right side turn signal light does not operate*4	Side turn signal bulb	Click here
	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	Meter/gauge system	Click here
Turn signal lights do not operate in one direction	Turn signal switch circuit	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 LED Headlight
*2: for Halogen Headlight
*3: for LED Type
*4: for Bulb Type

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
Hazard warning signal switch indicator does not illuminate	Hazard warning signal switch assembly	Click here
	Combination meter assembly	Click here
	Harness or connector	-

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

Door Mirror Foot Light Control (w/ Door Mirror Foot Light Control)
Symptom	Suspected Area	Link
All of the door mirror foot lights do not illuminate	Power door lock control system	Click here
	Wireless door lock control system (w/ Entry and Start System)	Click here
	Wireless door lock control system (w/o Entry and Start System)	Click here
	Entry and start system (for Entry Function) (w/ Entry and Start System)	Click here
	Door unlock detection switch circuit	Click here
	Footwell light circuit	Click here
	Main body ECU (Multiplex network body ECU) (for LHD)	Click here
	Main body ECU (Multiplex network body ECU) (for RHD)	Click here
Left or right door mirror foot light does not illuminate	Door mirror foot light	Click here
Left or right door mirror foot light does not illuminate	Harness or connector	-

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) (for LHD)	Click here
	Main body ECU (Multiplex network body ECU) (for RHD)	Click here