LIGHTING SYSTEM PROBLEM SYMPTOMS TABLE

Note

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

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.

Front Interior Light
Symptom	Suspected Area	Link
Front map light (LH side) does not illuminate	Bulb	-
	Map light assembly	Click here
	Harness or connector	-
Front map light (RH side) does not illuminate	Bulb	-
	Map light assembly	Click here
	Harness or connector	-
Front dome light does not illuminate	Bulb	-
	Interior light switch signal circuit	Click here
	Map light assembly	Click here
	Harness or connector	-
	Main body ECU (Multiplex network body ECU)	Click here

Rear Interior Light
Symptom	Suspected Area	Link
Rear map light (LH side) does not illuminate	Bulb	-
	Spot light assembly	Click here
	Harness or connector	-
Rear map light (RH side) does not illuminate	Bulb	-
	Spot light assembly	Click here
	Harness or connector	-
Rear dome light does not illuminate	Bulb	-
	Spot light assembly	Click here
	Harness or connector	-
	Main body ECU (Multiplex network body ECU)	Click here

Vanity Light
Symptom	Suspected Area	Link
Vanity light LH does not illuminate	Bulb	-
	Visor assembly LH	Click here
	Harness or connector	-
Vanity light RH does not illuminate	Bulb	-
	Visor assembly RH	Click here
	Harness or connector	-

Door Courtesy Light
Symptom	Suspected Area	Link
Courtesy light LH does not illuminate	Bulb	-
	Courtesy light assembly LH	Click here
	Front door courtesy switch circuit	Click here
	Harness or connector	-
	Main body ECU (Multiplex network body ECU)	Click here
Courtesy light RH does not illuminate	Bulb	-
	Courtesy light assembly RH	Click here
	Front door courtesy switch circuit	Click here
	Harness or connector	-
	Main body ECU (Multiplex network body ECU)	Click here

Glove Box Light
Symptom	Suspected Area	Link
Glove box light does not illuminate	Glove box light assembly	Click here
Glove box light does not illuminate	Harness or connector	-

Luggage Compartment Room Light
Symptom	Suspected Area	Link
Luggage compartment room light does not illuminate	Bulb	-
	No. 1 luggage compartment light assembly	Click here
	Luggage compartment door courtesy switch circuit	Click here
	Harness or connector	-
	Main body ECU (Multiplex network body ECU)	Click here

Footwell Light
Symptom	Suspected Area	Link
Footwell light LH does not illuminate	Bulb	-
	No. 1 interior illumination light assembly LH	Click here
	Harness or connector	-
Footwell light RH does not illuminate	Bulb	-
	No. 1 interior illumination light assembly RH	Click here
	Harness or connector	-

Front Door Inside Handle Illumination Light
Symptom	Suspected Area	Link
Front door inside handle illumination light LH does not illuminate	Front door inside handle illumination light assembly LH	Click here
	Harness or connector	-
	Instrument panel junction block assembly	Click here
Front door inside handle illumination light RH does not illuminate	Front door inside handle illumination light assembly RH	Click here
	Harness or connector	-
	Instrument panel junction block assembly	Click here

Interior Light Power Source Control
Symptom	Suspected Area	Link
All the interior lights that receive power via the DOME CUT relay do not illuminate	Interior light auto cut circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here

Illuminated Entry System (Interior Light Control)
Symptom	Suspected Area	Link
Interior light control does not operate normally	Interior light circuit	Click here
	Interior light switch signal circuit	Click here
	Front door courtesy switch circuit	Click here
	Rear door courtesy switch circuit	Click here
	Door unlock detection switch circuit	Click here
	IG signal circuit	Click here
	ACC signal circuit	Click here
	CAN communication system	Click here
	Main body ECU (Multiplex network body ECU)	Click here
Power switch illumination does not illuminate	CAN communication system	Click here
	Power switch illumination circuit	Click here
	Certification ECU (Smart key ECU assembly)	-

Illuminated Entry System (Front Door Inside Handle Illumination Light Control)
Symptom	Suspected Area	Link
Front door inside handle illumination light control does not operate normally	Front door courtesy switch circuit	Click here
	Rear door courtesy switch circuit	Click here
	Door unlock detection switch circuit	Click here
	Inside handle illumination light circuit	Click here
	CAN communication system	Click here
	Main body ECU (Multiplex network body ECU)	Click here
Front door inside handle illumination light dimmer control does not operate	CAN communication system	Click here
	Main body ECU (Multiplex network body ECU)	Click here

Battery Saving Control
Symptom	Suspected Area	Link
Battery saving function does not operate	IG signal circuit	Click here
	ACC signal circuit	Click here
	Front door courtesy switch circuit	Click here
	Rear door courtesy switch circuit	Click here
	Luggage compartment door courtesy switch circuit	Click here
	Door unlock detection switch circuit	Click here
	Interior light auto cut circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here