LIGHTING SYSTEM PROBLEM SYMPTOMS TABLE

Note

Before replacing the main body ECU (multiplex network body ECU) and crtification ECU (smart key ECU assembly), refer to Service Bulletin.
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.

Map Light Sub-assembly
Symptom	Suspected Area	Link
Front map light LH or front map light RH does not illuminate.	Map light sub-assembly	Click here
	Harness or connector	-

Map Light Sub-assembly (Front Dome Light)
Symptom	Suspected Area	Link
Front dome light does not illuminate.	Map light sub-assembly	Click here
	Interior light circuit	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.	Visor light bulb	Click here
	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
	Door courtesy switch circuit	Click here
	Harness or connector	-
	Main body ECU (multiplex network body ECU)	Click here

Door Ambient Illumination Light
Symptom	Suspected Area	Link
Door ambient illumination light LH does not illuminate.	Front door trim board sub-assembly LH (door ambient illumination light LH)	Click here
Door ambient illumination light LH does not illuminate.	Harness or connector	-
Door ambient illumination light RH does not illuminate.	Front door trim board sub-assembly RH (door ambient illumination light RH)	Click here
Door ambient illumination light RH does not illuminate.	Harness or connector	-
Door ambient illumination light LH and door ambient illumination light RH does not turn on or off.	Ambient illumination light circuit	Click here
	Main body ECU (multiplex network body ECU)	Click here

Instrument Panel Ambient Illumination Light
Symptom	Suspected Area	Link
Instrument panel ambient illumination light does not turn on or off.	Ambient illumination light circuit	Click here
	Main body ECU (multiplex network body ECU)	Click here

Footwell Light
Symptom	Suspected Area	Link
Footwell light LH does not illuminate.	No. 1 interior illumination light assembly LH (footwell light LH)	Click here
	Driver side junction block assembly	Click here
	Harness or connector	-
Footwell light RH does not illuminate.	No. 1 interior illumination light assembly RH (footwell light RH)	Click here
	Driver side junction block assembly	Click here
	Harness or connector	-
Footwell light LH and footwell light RH does not turn on or off.	Footwell light circuit	Click here
	Main body ECU (multiplex network body ECU)	Click here

Console Box Illumination Light
Symptom	Suspected Area	Link
Console box illumination light does not illuminate.	Console box illumination light assembly	Click here
Console box illumination light does not illuminate.	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 Light
Symptom	Suspected Area	Link
Luggage compartment light do not illuminate.	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

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

Instrument Panel Register Light
Symptom	Suspected Area	Link
Instrument panel register light (for Driver Side) does not illuminate.	No. 1 instrument panel register assembly	Click here
	Harness or connector	-
Instrument panel register light (for Front Passenger Side) does not illuminate.	No. 2 instrument panel register assembly	Click here
	Harness or connector	-
Instrument panel register light (for Center) does not illuminate.	Center instrument panel register assembly	Click here
	Harness or connector	-

Illuminated Entry System (Interior Light Control)
Symptom	Suspected Area	Link
All interior light control functions do not operate under any condition.	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
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
Door open/close-linked control function does not operate when doors are opened/closed.	Door courtesy switch circuit	Click here
	Main body ECU (multiplex network body ECU)	Click here
Engine switch illumination does not illuminate.	Engine switch illumination circuit	Click here
Engine switch illumination does not illuminate.	Certification ECU (smart key ECU assembly)	Refer to Service Bulletin
Engine switch illumination does not blinking.	Certification ECU (smart key ECU assembly)	Refer to Service Bulletin
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
Shift position-linked control function does not operate when shift lever to P.	Electronic shift lever 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

Instrument Panel Illumination System
Symptom	Suspected Area	Link
No instrument panel illumination lights come on (taillights operate normally).	PANEL D fuse	-
	PANEL P fuse	-
	Driver side junction block assembly (PANEL D relay)	Click here
	Passenger side junction block assembly (PANEL P relay)	-
	Harness or connector	-
	Main body ECU (multiplex network body ECU)	Click here
	Combination meter assembly	Click here