LIGHTING SYSTEM PROBLEM SYMPTOMS TABLE

Note

Initialize the headlight leveling ECU assembly after the vehicle height changes due to replacement of the suspension or after performing such operations as removal and reinstallation or replacement of the rear height control sensor sub-assembly.

Click here
When the headlight leveling ECU assembly is replaced, initialization is also necessary.

Click here

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	See page
One low beam headlight does not illuminate	No. 2 headlight bulb	Click here
	No. 1 integration relay	Click here
	Harness or connector	-
Both left and right low beam headlights do not illuminate	P/I 2 fuse	-
	Headlight dimmer switch circuit	Click here
	Low beam headlight circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here
One high beam headlight does not illuminate	H-LP LH HI fuse or H-LP RH HI fuse	-
	No. 1 headlight bulb	Click here
	Harness or connector	-
Both left and right high beam headlights do not illuminate	H-LP HI MAIN fuse	-
	Headlight dimmer switch circuit	Click here
	High beam headlight circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here
"High Flash" (passing function) does not operate (high beam headlights are normal)	Headlight dimmer switch circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here
One clearance light does not illuminate	Headlight unit	Click here
One clearance light does not illuminate	Harness or connector	-

Headlight (for LED Headlight)
Symptom	Suspected Area	See page
One low beam headlight does not illuminate	No. 1 integration relay	Click here
	Headlight unit assembly	Click here
	Headlight unit	Click here
	Harness or connector	-
Both left and right low beam headlights do not illuminate	P/I 2 fuse	-
	Headlight dimmer switch circuit	Click here
	Low beam headlight circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here
One high beam headlight does not illuminate	H-LP LH HI fuse or H-LP RH HI fuse	-
	Headlight unit assembly	Click here
	Headlight unit	Click here
	Harness or connector	-
Both left and right high beam headlights do not illuminate	H-LP HI MAIN fuse	-
	Headlight dimmer switch circuit	Click here
	High beam headlight circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here
"High Flash" (passing function) headlight does not illuminate (high beam headlights are normal)	Headlight dimmer switch circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here
One clearance light does not illuminate	Headlight unit assembly	Click here
	Headlight lens	Click here
	Harness or connector	-

Daytime Running Light System (for Halogen Headlight)
Symptom	Suspected Area	See page
Daytime running light system does not operate (both left and right daytime running lights do not illuminate)	CAN communication system	Click here
	IG signal circuit	Click here
	Headlight dimmer switch circuit	Click here
	Parking brake switch circuit	Click here
	Daytime running light relay circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here
One side daytime running light does not illuminate	Headlight unit	Click here
One side daytime running light does not illuminate	Harness or connector	-

Daytime Running Light System (for LED Headlight)
Symptom	Suspected Area	See page
Daytime running light system does not operate (both left and right daytime running lights do not illuminate)	CAN communication system	Click here
	IG signal circuit	Click here
	Headlight dimmer switch circuit	Click here
	Parking brake switch circuit	Click here
	Daytime running light relay circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here
One side daytime running light does not illuminate	Headlight unit assembly	Click here
	Headlight lens	Click here
	Harness or connector	-

Taillight
Symptom	Suspected Area	See page
One side taillight (rear combination light assembly) does not illuminate	Rear combination light lens and body	Click here
	Rear combination light LED	Click here
	Harness or connector	-
One side taillight (rear light assembly) does not illuminate	Rear light socket and wire	Click here
	Rear light LED	Click here
	Harness or connector	-
All of the lights (taillights, clearance lights, license plate lights and rear side marker lights*) do not illuminate	Headlight dimmer switch circuit	Click here
	Taillight relay circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here

*: w/ Rear Side Marker Light

Rear Side Marker Light (w/ Rear Side Marker Light)
Symptom	Suspected Area	See page
One side rear side marker light does not illuminate	Rear combination light lens and body	Click here

License Plate Light
Symptom	Suspected Area	See page
License plate light does not illuminate	License plate light assembly	Click here
License plate light does not illuminate	Harness or connector	-

Stop Light
Symptom	Suspected Area	See page
One side stop light (rear combination light assembly) does not illuminate	Rear combination light lens and body	Click here
	Rear combination light LED	Click here
	Harness or connector	-
One side stop light (rear light assembly) does not illuminate	Rear light socket and wire	Click here
	Rear light LED	Click here
	Harness or connector	-
All of the stop lights do not illuminate	STOP fuse	-
	Stop light switch assembly	Click here
	Stop light control ECU assembly	Click here
	Harness or connector	-
All of the stop lights do not turn off	Stop light switch assembly	Click here
	Stop light control ECU assembly	Click here
	Skid control ECU (brake booster with master cylinder assembly) (for LHD)*	Click here
	Skid control ECU (brake booster with master cylinder assembly) (for RHD)*	Click here

*: The stop lights may always come on due to abnormality of the skid control ECU (brake booster with master cylinder assembly).

High Mounted Stop Light
Symptom	Suspected Area	See page
High mounted stop light does not illuminate	Center stop light assembly	Click here
	Radio setting condenser	Click here
	Harness or connector	-

Front Fog Light (w/ Front Fog Light)
Symptom	Suspected Area	See page
One front fog light does not illuminate	Fog light assembly	Click here
One front fog light does not illuminate	Harness or connector	-
Both left and right front fog lights do not illuminate (taillights are normal)	Headlight dimmer switch circuit	Click here
	Front fog light circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here

Rear Fog Light (w/ Rear Fog Light)
Symptom	Suspected Area	See page
Rear fog light does not illuminate	Rear light lens and body	Click here
	Rear light socket and wire	Click here
	Headlight dimmer switch circuit	Click here
	Rear fog light circuit	Click here
	Harness or connector	-

Back-up Light (w/o Rear Fog Light)
Symptom	Suspected Area	See page
One back-up light does not illuminate	Rear light lens and body	Click here
	Rear light socket and wire	Click here
	Harness or connector	-
Both left and right back-up lights do not illuminate	Back-up light circuit	Click here

Back-up Light (w/ Rear Fog Light)
Symptom	Suspected Area	See page
Back-up light does not illuminate	Back-up light circuit	Click here
	Rear light lens and body	Click here
	Rear light socket and wire	Click here

Turn Signal Light
Symptom	Suspected Area	See page
One front turn signal light does not operate*1	Front turn signal light bulb	Click here
One front turn signal light does not operate*1	Harness or connector	-
One front turn signal light does not operate*2	Front turn signal light bulb	Click here
	Front turn signal light socket and wire	Click here
	Harness or connector	-
One side turn signal light does not operate*3	Side turn signal light assembly	Click here
	Outer rear view mirror assembly	Click here
	Harness or connector	-
One side turn signal light does not operate*4	Side turn signal light assembly	Click here
	Outer rear view mirror assembly	Click here
	Outer mirror control ECU assembly	Click here
	Harness or connector	-
One rear turn signal light does not operate	Rear combination light lens and body	Click here
	Rear light lens and body	Click here
	Rear light socket and wire	Click here
	Harness or connector	-
All turn signal lights do not operate	TURN & HAZ fuse, ECU-IG NO. 2 fuse	-
	Headlight dimmer switch assembly	Click here
	Turn signal flasher assembly	Click here
	Harness or connector	-
Turn signal lights do not operate in one direction	Headlight dimmer switch assembly	Click here
	Turn signal flasher assembly	Click here
	Harness or connector	-
All turn signal lights do not flash at the correct speed	Turn signal flasher assembly	Click here

*1: for Halogen Headlight
*2: for LED Headlight
*3: w/o Seat Position Memory
*4: w/ Seat Position Memory

Hazard Warning Light
Symptom	Suspected Area	See page
Hazard warning lights do not operate	Hazard warning switch circuit	Click here
Hazard warning lights do not operate	Main body ECU (Multiplex network body ECU)	Click here

Door Mirror Foot Light (w/o Seat Position Memory)
Symptom	Suspected Area	See page
One door mirror foot light does not illuminate	Bulb	Click here
	Outer rear view mirror assembly	Click here
	Harness or connector	-
Both left and right door mirror foot lights do not illuminate	CAN communication system	Click here
	Power door lock control system	Click here
	Wireless door lock control system	Click here
	Entry and start system (for entry function)	Click here
	Door mirror foot light circuit	Click here
	Door unlock detection switch circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here

Door Mirror Foot Light (w/ Seat Position Memory)
Symptom	Suspected Area	See page
One door mirror foot light does not illuminate	Bulb	Click here
	Door mirror foot light circuit	Click here
	Outer mirror control ECU assembly	Click here
Both left and right door mirror foot light do not illuminate	CAN communication system	Click here
	Power door lock control system	Click here
	Wireless door lock control system	Click here
	Entry and start system (for entry function)	Click here
	Door mirror foot light circuit	Click here
	Door unlock detection switch circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here

Automatic Light Control System
Symptom	Suspected Area	See page
Automatic light control system does not operate	Headlight dimmer switch circuit	Click here
Automatic light control system does not operate	Main body ECU (Multiplex network body ECU)	Click here

Light Auto Turn-off System
Symptom	Suspected Area	See page
Light auto turn-off system does not operate	Headlight dimmer switch circuit	Click here
	Door courtesy switch circuit	Click here
	IG signal circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here

Automatic Headlight Beam Level Control System (for LED Headlight)
Symptom	Suspected Area	See page
Headlight beam level control indicator light flashes	Indicator circuit	Click here
	Headlight leveling ECU assembly (for LHD)	Click here
	Headlight leveling ECU assembly (for RHD)	Click here
Headlight beam level control does not operate (indicator light is off)	Fail-safe function	Click here
	Headlight leveling ECU power source circuit	Click here
	Headlight signal circuit	Click here
	Headlight beam level control actuator circuit	Click here
	Speed signal circuit	Click here
	Headlight leveling ECU assembly (for LHD)	Click here
	Headlight leveling ECU assembly (for RHD)	Click here
Headlight beam level control system indicator light does not come on when turning the power switch on (IG)	Indicator circuit	Click here
	Headlight leveling ECU assembly (for LHD)	Click here
	Headlight leveling ECU assembly (for RHD)	Click here
	Combination meter assembly	Click here
DTC information cannot be detected	Diagnosis circuit	Click here
	Headlight leveling ECU assembly (for LHD)	Click here
	Headlight leveling ECU assembly (for RHD)	Click here
Initialization cannot be performed	LVL terminal circuit	Click here
	Headlight leveling ECU assembly (for LHD)	Click here
	Headlight leveling ECU assembly (for RHD)	Click here

Manual Headlight Beam Level Control System (for Halogen Headlight)
Symptom	Suspected Area	See page
Headlight beam level control does not operate	Headlight leveling switch	Click here
	Harness or connector	-
	Headlight leveling motor	Click here
Illumination for headlight leveling switch does not come on with tail switch on	Headlight leveling switch	Click here
	Harness or connector	-

Welcome Light Illumination Control
Symptom	Suspected Area	See page
Welcome light illumination control does not operate	Wireless door lock control system	Click here
	Headlight dimmer switch circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here

Follow Me Home Control (w/ Follow Me Home Control)
Symptom	Suspected Area	See page
Follow me home system does not operate	IG signal circuit	Click here
	Headlight dimmer switch circuit	Click here
	Main body ECU (Multiplex network body ECU)	Click here

Automatic High Beam System (w/ Automatic High Beam System)
Symptom	Suspected Area	See page
Automatic high beam system does not operate or automatic high beam indicator does not illuminate (low beam headlights and high beam headlights are normal)	Check automatic high beam indicator light	Click here
	Check Data List (Auto H Beam STS0)
	Perform Active Test (Automatic High Beam Indicator)
	Auto high beam switch
	Harness or connector