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.

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

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 and Taillight (for Halogen Headlight)
Symptom Suspected Area See page
One low beam headlight does not illuminate. Bulb -
No. 1 integration relay

Click here

Harness or connector -
Both left and right low beam headlights do not illuminate. 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 -
Bulb -
No. 1 integration relay

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 front parking light does not illuminate. Bulb -
Harness or connector -
One rear taillight does not illuminate. Rear combination light assembly

Click here

Harness or connector -
One license plate light does not illuminate. Bulb -
Harness or connector -
All of the lights (rear taillights, parking lights, and license plate lights) do not illuminate. TAIL fuse -
Headlight dimmer switch circuit

Click here

Taillight relay circuit

Click here

Main body ECU (Multiplex network body ECU)

Click here

Headlight and Taillight (for LED Headlight)
Symptom Suspected Area See page
One low beam headlight does not illuminate. No. 1 integration relay

Click here

Headlight unit

Click here

Harness or connector -
Both left and right low beam headlights do not illuminate. Headlight dimmer switch circuit

Click here

Low beam headlight circuit

Click here

Main body ECU (Multiplex network body ECU)

Click here

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 front parking light does not illuminate. Bulb -
Harness or connector -
One rear taillight does not illuminate. Rear combination light assembly

Click here

Harness or connector -
One license plate light does not illuminate. Bulb -
Harness or connector -
All of the lights (rear taillights, parking lights and license plate lights) do not illuminate. TAIL fuse -
Headlight dimmer switch circuit

Click here

Taillight relay circuit

Click here

Main body ECU (Multiplex network body ECU)

Click here

LED headlight warning light does not illuminate (LED headlights are normal). Harness or connector -
Headlight unit

Click here

Main body ECU (Multiplex network body ECU)

Click here

Meter circuit plate (w/o Multi-information display)

Click here

Combination meter sub-assembly (w/ Multi-information display)

Click here

Stop Light
Symptom Suspected Area See page
One side stop light does not illuminate. Rear combination light assembly

Click here

Harness or connector -
High mounted stop light does not illuminate. Center stop light assembly

Click here

Center stop light wire harness

Click here

Harness or connector -
All of the stop lights do not illuminate. STOP fuse -
Stop light switch assembly

Click here

Harness or connector -
Stop lights remain on. Electronically controlled brake system

Click here

Stop light switch assembly

Click here

Harness or connector -
Skid control ECU (for LHD)

Click here

Skid control ECU (for RHD)

Click here

Front Fog Light
Symptom Suspected Area See page
One front fog light does not illuminate. Bulb -
Harness or connector -
Both left and right front fog lights do not illuminate (taillights are normal). FR FOG fuse -
Headlight dimmer switch circuit

Click here

Front fog light circuit

Click here

Main body ECU (Multiplex network body ECU)

Click here

Rear Fog Light
Symptom Suspected Area See page
Rear fog light does not illuminate. Bulb -
RR FOG fuse -
Headlight dimmer switch circuit

Click here

Rear fog light circuit

Click here

Main body ECU (Multiplex network body ECU)

Click here

Back-up Light
Symptom Suspected Area See page
One back-up light does not illuminate. Bulb -
Harness or connector -
Both left and right back-up lights do not illuminate. Back-up light circuit

Click here

Harness or connector -
Hybrid vehicle control ECU

Click here

Turn Signal Light
Symptom Suspected Area See page
One turn signal light does not operate (except side turn signal lights). Bulb -
Harness or connector -
Turn signal lights do not operate in one direction. Headlight dimmer switch assembly (Turn signal light switch)

Click here

Meter circuit plate (w/o Multi-information display)

Click here

Combination meter sub-assembly (w/ Multi-information display)

Click here

Harness or connector -
All turn signal lights do not operate. ECU-IG NO. 2 fuse -
HAZ fuse -
Headlight dimmer switch assembly (Turn signal light switch)

Click here

Meter circuit plate (w/o Multi-information display)

Click here

Combination meter sub-assembly (w/ Multi-information display)

Click here

Harness or connector -
All turn signal lights do not flash at the correct speed. Bulb -
Meter circuit plate (w/o Multi-information display)

Click here

Combination meter sub-assembly (w/ Multi-information display)

Click here

Harness or connector -
Hazard Warning Light
Symptom Suspected Area See page
Hazard warning lights do not operate. Hazard warning switch circuit

Click here

Meter circuit plate (w/o Multi-information display)

Click here

Combination meter sub-assembly (w/ Multi-information display)

Click here

Automatic Light Control System (w/ Automatic Light Control)
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 (for European Models)
Symptom Suspected Area See page
Light auto turn-off system does not operate. (Light control switch is in TAIL or HEAD position) Headlight dimmer switch circuit

Click here

IG signal circuit

Click here

Main body ECU (Multiplex network body ECU)

Click here

Light auto turn-off system does not operate. (Light control switch is in AUTO position) Headlight dimmer switch circuit

Click here

IG signal circuit

Click here

Main body ECU (Multiplex network body ECU)

Click here

Light Auto Turn-off System (except European Models)
Symptom Suspected Area See page
Light auto turn-off system does not operate. Headlight dimmer switch circuit

Click here

Front door courtesy switch circuit

Click here

IG signal circuit

Click here

Main body ECU (Multiplex network body ECU)

Click here

Daytime Running Light Control
Symptom Suspected Area See page
Daytime running light control does not operate. Headlight dimmer switch circuit

Click here

IG signal 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

Manual Headlight Beam Level Control (for Halogen Headlight)
Symptom Suspected Area See page
Headlight beam level control does not operate. Headlight leveling switch assembly

Click here

Harness or connector -
Headlight leveling motor

Click here

Automatic Headlight Beam Level Control (for LED Headlight)
Symptom Suspected Area See page
Headlight beam level control indicator light flashes. Indicator circuit

Click here

Headlight leveling ECU assembly

Click here

Headlight beam level control does not operate (indicator light is off). Fail-safe function

Click here

Headlight beam level control actuator circuit

Click here

Headlight signal circuit

Click here

Headlight leveling ECU power source circuit

Click here

Meter circuit plate (w/o Multi-information display)

Click here

Combination meter sub-assembly (w/ Multi-information display)

Click here

Headlight leveling ECU assembly

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 power source circuit

Click here

Headlight leveling ECU assembly

Click here

Meter circuit plate (w/o Multi-information display)

Click here

Combination meter sub-assembly (w/ Multi-information display)

Click here

DTC information cannot be detected. Diagnosis circuit

Click here

Headlight leveling ECU assembly

Click here

Initialization cannot be performed. LVL terminal circuit

Click here

Headlight leveling ECU assembly

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)
Integration control and panel assembly (Auto high beam switch)
Harness or connector