LIGHTING SYSTEM PROBLEM SYMPTOMS TABLE

Note

Before replacing the main 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 Map Light
Symptom	Suspected Area	Link
Front map light LH or front map light RH does not illuminate	Map light assembly	Click here
	Harness or connector	-

Front Dome Light
Symptom	Suspected Area	Link
Front dome light does not illuminate	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 dome light does not illuminate	Rear dome light	Click here
	Harness or connector	-
	Main body ECU (Multiplex network body ECU)	Click here

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

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

Ambient Illumination Light
Symptom	Suspected Area	Link
Ambient illumination light LH or ambient illumination light RH does not illuminate	Ambient illumination light	Click here
	Harness or connector	-

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 or footwell light RH does not illuminate	No. 1 interior illumination light assembly	Click here
Footwell light LH or footwell light RH does not illuminate	Harness or connector	-

Interior Light Power Source Control
Symptom	Suspected Area	Link
All the interior lights that receive power via the DOME CUT relay do not illuminate (The DOME fuse is normal)	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
All interior light control functions do not operate under any condition	Interior light switch signal circuit	Click here
	Interior light circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here
Door open/close-linked control function does not operate when doors are opened/closed	Door courtesy switch circuit	Click here
	Map light assembly	Click here
	Main body ECU (Multiplex network body ECU)	Click here
Door lock/unlock-linked control function does not operate when doors are locked/unlocked	Door unlock detection switch circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here
Actuation area-linked control function does not operate when registered key is brought into any exterior detection area	CAN communication system	Click here
	Entry and start system (for Entry Function)	Click here
	Main body ECU (Multiplex network body ECU)	Click here
Engine switch-linked control function does not operate when engine switch is operated	IG signal circuit	Click here
	ACC signal circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here
Engine switch illumination does not illuminate	CAN communication system	Click here
	Engine switch illumination circuit	Click here
	Certification ECU (Smart key ECU assembly)	-

Illuminated Entry System (Ambient Illumination Light)
Symptom	Suspected Area	Link
All interior light control functions do not operate under any condition	Ambient illumination light circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here
Engine switch-linked control function does not operate when engine switch is operated	IG signal circuit	Click here
	ACC signal circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here
Brightness of lights does not change when shift lever is moved	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
	Door courtesy switch circuit	Click here
	Luggage compartment door courtesy switch circuit	Click here
	Interior light 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