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.

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  • 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

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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

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

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


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

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


High Mounted Stop Light
Symptom Suspected Area See page
High mounted stop light does not illuminate Center stop light assembly

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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

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

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


Hazard Warning Light
Symptom Suspected Area See page
Hazard warning lights do not operate Hazard warning switch circuit

Click here

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

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

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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