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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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.
Inspect the fuses, relays and bulbs related to this system before inspecting the suspected areas below.

Illuminated Entry System
Symptom	Suspected Area	Link
Illuminated entry system does not operate normally	Smart entry and start system (for Entry Function)	Click here
	Light cut relay (D/C CUT)	Click here
	Front door courtesy light switch assembly	Click here
	Rear door courtesy light switch assembly	Click here
	Front door lock assembly	Click here
	Rear door lock assembly	Click here
	Back door lock assembly	Click here
	Harness or connector	-
	Instrument panel junction block assembly	Click here
	Body ECU	Click here
Only engine switch illumination does notilluminate*1	Engine switch illumination circuit	Click here
	Harness or connector	-
	Body ECU	Click here
	Certification ECU (smart key ECU assembly)	-
Only ignition key cylinder light does notilluminate*2	Transponder key coil	Click here
	Harness or connector	-
	Body ECU	Click here
Map light does not illuminate (The room light illuminates)	Light cut relay (D/C CUT)	Click here
	Map light assembly	Click here
	Body ECU	Click here
	Harness or connector	-

*1: w/ Smart Entry and Start System

*2: w/o Smart Entry and Start System

Battery Saving Control
Symptom	Suspected Area	Link
Battery saving function does not operate	Front door courtesy light switch assembly	Click here
	Rear door courtesy light switch assembly	Click here
	Back door lock assembly	Click here
	Instrument panel junction block assembly	Click here
	Harness or connector	-
	Body ECU	Click here

Map Light
Symptom	Suspected Area	Link
Map light does not illuminate	Map light assembly	Click here
	Front door courtesy light switch assembly	Click here
	Rear door courtesy light switch assembly	Click here
	Back door lock assembly	Click here
	Harness or connector	-

Spot Light Assembly
Symptom	Suspected Area	Link
Spot light does not illuminate	Spot light assembly	Click here
	Front door courtesy light switch assembly	Click here
	Rear door courtesy light switch assembly	Click here
	Back door lock assembly	Click here
	Harness or connector	-

No. 1 Room Light
Symptom	Suspected Area	Link
No. 1 room light does not illuminate	No. 1 room light assembly	Click here
	Front door courtesy light switch assembly	Click here
	Rear door courtesy light switch assembly	Click here
	Back door lock assembly	Click here
	Harness or connector	-

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

Vanity Light Assembly (w/ Vanity Light)
Symptom	Suspected Area	Link
Vanity light assembly does not illuminate.	Vanity light bulb	Click here
	Visor assembly	Click here
	Harness or connector	-

Door Courtesy Light (w/ Courtesy Light)
Symptom	Suspected Area	Link
Door courtesy light does not illuminate.	Door courtesy bulb (for Front Door)	Click here
	Door courtesy bulb (for Rear Door)	Click here
	Harness or connector	-

Instrument Panel Illumination
Symptom	Suspected Area	Link
No instrument panel illumination comes on	Headlight dimmer switch assembly	Click here
No instrument panel illumination comes on	Harness or connector	-