LIGHTING SYSTEM PROBLEM SYMPTOMS TABLE

Note

When replacing the body ECU, be sure to initialize the automatic light control system.

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As the door control battery is installed between the vehicle battery and body ECU, first perform the inspections to confirm that there are no malfunctions in the power source circuit for the body ECU before performing this troubleshooting procedure.

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When replacing the combination meter assembly, make sure to replace it with a new one.

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 Halogen Headlight)
Symptom	Suspected Area	Link
Both left and right low beam headlights do not illuminate.	Headlight relay (H-LP)	Click here
	Headlight dimmer switch assembly	Click here
	Instrument panel junction block assembly	Click here
	Body ECU	Click here
	Harness or connector	-
Low beam headlight on right side does not illuminate.	H-LP RH-LO fuse	-
	Headlight bulb	Click here
	Harness or connector	-
Low beam headlight on left side does not illuminate.	H-LP LH-LO fuse	-
	Headlight bulb	Click here
	Harness or connector	-
Both left and right high beam headlights do not illuminate.	Headlight dimmer relay (DIMMER)	Click here
	Headlight dimmer switch assembly	Click here
	Instrument panel junction block assembly	Click here
	Body ECU	Click here
	Harness or connector	-
High beam headlight on right side does not illuminate.	H-LP RH-HI fuse	-
	Headlight bulb	Click here
	Harness or connector	-
High beam headlight on left side does not illuminate.	H-LP LH-HI fuse	-
	Headlight bulb	Click here
	Harness or connector	-
High beam flash function does not operate (high beam headlights are normal).	Headlight dimmer switch assembly	Click here
	Body ECU	Click here
	Harness or connector	-
Both left and right low beam and high beam headlights do not illuminate.	H-LP MAIN fuse	-
	Headlight dimmer switch assembly	Click here
	Harness or connector	-

Headlight (for LED Headlight)
Symptom	Suspected Area	Link
Both left and right low beam headlights do not illuminate.	Headlight relay (H-LP)	Click here
	Headlight dimmer switch assembly	Click here
	Instrument panel junction block assembly	Click here
	Body ECU	Click here
	Harness or connector	-
Low beam headlight on right side does not illuminate.	H-LP RH-LO fuse	-
	Headlight assembly RH	Click here
	Harness or connector	-
Low beam headlight on left side does not illuminate.	H-LP LH-LO fuse	-
	Headlight assembly LH	Click here
	Harness or connector	-
Both left and right high beam headlights do not illuminate.	Headlight dimmer relay (DIMMER)	Click here
	Headlight dimmer switch assembly	Click here
	Instrument panel junction block assembly	Click here
	Body ECU	Click here
	Harness or connector	-
High beam headlight on right side does not illuminate.	H-LP RH-HI fuse	-
	Headlight assembly RH	Click here
	Harness or connector	-
High beam headlight on left side does not illuminate.	H-LP LH-HI fuse	-
	Headlight assembly LH	Click here
	Harness or connector	-
High beam flash function does not operate (high beam headlights are normal).	Headlight dimmer switch assembly	Click here
	Body ECU	Click here
	Harness or connector	-
Both left and right low beam and high beam headlights do not illuminate.	H-LP MAIN fuse	-
	Headlight dimmer switch assembly	Click here
	Harness or connector	-

Clearance Light (for Halogen Headlight)
Symptom	Suspected Area	Link
Both left and right clearance lights do not illuminate (taillights are normal).	Harness or connector	-
Clearance light on one side does not illuminate.	Clearance light bulb	Click here
Clearance light on one side does not illuminate.	Harness or connector	-

Clearance Light (for LED Headlight)
Symptom	Suspected Area	Link
Both left and right clearance lights do not illuminate (taillights are normal).	Harness or connector	-
Clearance light on right side does not illuminate.	Headlight assembly RH	Click here
Clearance light on right side does not illuminate.	Harness or connector	-
Clearance light on left side does not illuminate.	Headlight assembly LH	Click here
Clearance light on left side does not illuminate.	Harness or connector	-

Daytime Running Light (for Halogen Headlight)
Symptom	Suspected Area	Link
Both left and right daytime running lights do not illuminate.	Running light relay (DRL)	Click here
	FOG FR/DRL fuse	-
	CAN communication system	Click here
	Combination meter assembly	Click here
	Harness or connector	-
Daytime running light on one side does not illuminate.	DRL bulb	Click here
Daytime running light on one side does not illuminate.	Harness or connector	-

Daytime Running Light (for LED Headlight)
Symptom	Suspected Area	Link
Both left and right daytime running lights do not illuminate.	Running light relay (DRL)	Click here
	FOG FR/DRL fuse	-
	CAN communication system	Click here
	Combination meter assembly	Click here
	Harness or connector	-
Daytime running light on right side does not illuminate.	Headlight assembly RH	Click here
Daytime running light on right side does not illuminate.	Harness or connector	-
Daytime running light on left side does not illuminate.	Headlight assembly LH	Click here
Daytime running light on left side does not illuminate.	Harness or connector	-

Front Fog Light
Symptom	Suspected Area	Link
Both left and right front fog lights do not illuminate (taillights are normal).	Fog light relay (FOG FR)	Click here
	FOG FR/DRL fuse	-
	Instrument panel junction block assembly	Click here
	Body ECU	Click here
	Harness or connector	-
Front fog light on one side does not illuminate.	Front fog light bulb	Click here
	Instrument panel junction block assembly	Click here
	Harness or connector	-

License Plate Light
Symptom	Suspected Area	Link
License plate light does not illuminate (taillights are normal).	License plate light bulb	Click here
	Harness or connector	-

Taillight
Symptom	Suspected Area	Link
Taillight on right side does not illuminate.	Rear light assembly RH	Click here
	Rear combination light assembly RH	Click here
	Rear combination light socket and wire sub-assembly RH	Click here
	Harness or connector	-
Taillight on left side does not illuminate.	Rear light assembly LH	Click here
	Rear combination light assembly LH	Click here
	Rear combination light socket and wire sub-assembly LH	Click here
	Harness or connector	-
All of the lights, except the taillights, illuminate.	Harness or connector	-

Stop Light (w/o VSC)
Symptom	Suspected Area	Link
Stop light on right side does not illuminate.	Rear combination light assembly RH	Click here
	Rear combination light socket and wire sub-assembly RH	Click here
	Harness or connector	-
Stop light on left side does not illuminate.	Rear combination light assembly LH	Click here
	Rear combination light socket and wire sub-assembly LH	Click here
	Harness or connector	-
Center stop light does not illuminate.	Harness or connector	-
Center stop light does not illuminate.	Center stop light assembly	Click here
All of the stop lights do not illuminate.	STOP fuse	-
	Stop light switch assembly	Click here
	Harness or connector	-

Stop Light (w/ VSC)
Symptom	Suspected Area	Link
Stop light on right side does not illuminate.	Rear combination light assembly RH	Click here
	Rear combination light socket and wire sub-assembly RH	Click here
	Harness or connector	-
Stop light on left side does not illuminate.	Rear combination light assembly LH	Click here
	Rear combination light socket and wire sub-assembly LH	Click here
	Harness or connector	-
Center stop light does not illuminate.	Harness or connector	-
Center stop light does not illuminate.	Center stop light assembly	Click here
All of the stop lights do not operate normally.	STOP fuse	-
	Stop light switch assembly	Click here
	Harness or connector	-

Back-up Light
Symptom	Suspected Area	Link
Back-up light on right side does not illuminate.	Back-up light bulb	Click here
	Rear combination light socket and wire sub-assembly RH	Click here
	Harness or connector	-
Back-up light on left side does not illuminate.	Back-up light bulb	Click here
	Rear combination light socket and wire sub-assembly LH	Click here
	Harness or connector	-
Both left and right Back-up lights do not illuminate.	Back-up light switch assembly (for RC60F)	Click here
	Park/neutral position switch assembly (for AC60F)	Click here
	Harness or connector	-

Turn Signal Light
Symptom	Suspected Area	Link
No turn signal lights operate (hazard warning lights are normal).	Turn signal switch circuit	Click here
	Combination meter assembly	Click here
One of the turn signal lights does not operate.	Meter/gauge system	Click here
One of the turn signal lights does not operate.	Turn signal switch circuit	Click here

Hazard Warning Light System
Symptom	Suspected Area	Link
Hazard warning lights do not operate (turn signal lights are normal).	Hazard warning switch circuit	Click here
	Combination meter assembly	Click here
Emergency brake signal (hazard warning light blink) does not operate.	CAN communication system	Click here
	Vehicle stability control system	Click here
	Combination meter assembly	Click here

Automatic Light Control System
Symptom	Suspected Area	Link
Automatic light control system does not operate.	Automatic light control sensor	Click here
	Headlight dimmer switch assembly	Click here
	Body ECU	Click here
	Harness or connector	-

Light Auto Turn-off System
Symptom	Suspected Area	Link
Light auto turn-off system does not operate.	Front door courtesy light switch assembly RH	Click here
	Instrument panel junction block assembly	Click here
	Body ECU	Click here
	Harness or connector	-

Follow Me Home System
Symptom	Suspected Area	Link
Follow me home system does not operate.	Body ECU	Click here
Follow me home system does not operate.	Harness or connector	-