Lexus ES manuals

Lexus ES: Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

NOTICE:

  • Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

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  • If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the headlight ECU sub-assembly LH.*1

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  • If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information the headlight ECU sub-assembly LH.*2

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  • If the headlight assembly LH has been replaced, it is necessary to synchronize the vehicle information the headlight ECU sub-assembly LH.*3

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  • When replacing the headlight ECU sub-assembly LH, always replace it with a new one. If a headlight ECU sub-assembly LH 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.
  • 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.
    • *1: for LED Type Turn Signal Light
    • *2: for Bulb Type Turn Signal Light
    • *3: for Bulb Type Turn Signal Light (for TMMK Made)

HINT:

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

Symptom

Suspected Area

Link

Left low beam headlight does not illuminate

Headlight ECU sub-assembly LH

Headlight unit assembly LH*1

Headlight unit assembly LH*2

Headlight assembly LH*3

Right low beam headlight does not illuminate

Headlight ECU sub-assembly RH

Headlight unit assembly RH*1

Headlight unit assembly RH*2

Headlight assembly RH*3

Both left and right low beam headlights do not illuminate

Headlight dimmer switch circuit

Main body ECU (Multiplex network body ECU)

Left high beam headlight does not illuminate

High beam headlight circuit

Headlight ECU sub-assembly LH

Right high beam headlight does not illuminate

High beam headlight circuit

Headlight ECU sub-assembly RH

Both left and right high beam headlights do not illuminate

Headlight dimmer switch circuit

Main body ECU (Multiplex network body ECU)

High Flash (passing function) does not operate (high beam headlights are normal)

Headlight dimmer switch circuit

Main body ECU (Multiplex network body ECU)

Left low beam headlight and high beam headlight do not illuminate

Headlight ECU sub-assembly LH

Right low beam headlight and high beam headlight do not illuminate

Headlight ECU sub-assembly RH

Left low beam headlight and high beam headlight flicker

Headlight ECU sub-assembly LH

Right low beam headlight and high beam headlight flicker

Headlight ECU sub-assembly RH

  • *1: for LED Type Turn Signal Light
  • *2: for Bulb Type Turn Signal Light
  • *3: for Bulb Type Turn Signal Light (for TMMK Made)
Parking Light/Daytime Running Light

Symptom

Suspected Area

Link

Left parking light/daytime running light does not illuminate

Parking light/daytime running light circuit

Headlight ECU sub-assembly LH

Right parking light/daytime running light does not illuminate

Parking light/daytime running light circuit

Headlight ECU sub-assembly RH

Both left and right parking lights do not illuminate

Headlight dimmer switch circuit

Main body ECU (Multiplex network body ECU)

Both left and right daytime running lights do not illuminate

Check customize settings

Headlight dimmer switch circuit

Main body ECU (Multiplex network body ECU)

Left parking light/daytime running light flicker

Headlight ECU sub-assembly LH

Right parking light/daytime running light flicker

Headlight ECU sub-assembly RH

Cornering Light

Symptom

Suspected Area

Link

Left cornering light does not illuminate

Check operating conditions

Cornering light circuit

Headlight ECU sub-assembly LH

Right cornering light does not illuminate

Check operating conditions

Cornering light circuit

Headlight ECU sub-assembly RH

Left cornering light flicker

Headlight ECU sub-assembly LH

Right cornering light flicker

Headlight ECU sub-assembly RH

Front Side Marker Light

Symptom

Suspected Area

Link

Left front side marker light does not illuminate

Front side marker light circuit

Headlight ECU sub-assembly LH

Right front side marker light does not illuminate

Front side marker light circuit

Headlight ECU sub-assembly RH

Both left and right front side marker lights do not illuminate

Headlight dimmer switch circuit

Main body ECU (Multiplex network body ECU)

Left front side marker light flicker

Headlight ECU sub-assembly LH

Right front side marker light flicker

Headlight ECU sub-assembly RH

Taillight

Symptom

Suspected Area

Link

Left or right taillight (rear combination light assembly) does not illuminate

Rear combination light lens and body*1

Rear combination light assembly*2

Harness or connector

-

Left or right taillight (rear light assembly) does not illuminate

Rear light assembly

Harness or connector

-

All of the taillights, license plate lights and rear side marker lights do not illuminate

Headlight dimmer switch circuit

Taillight relay circuit

Main body ECU (Multiplex network body ECU)

  • *1: for TMC Made
  • *2: for TMMK Made
Rear Side Marker Light

Symptom

Suspected Area

Link

Left or right rear side marker light does not illuminate

Rear combination light lens and body*1

Rear combination light assembly*2

  • *1: for TMC Made
  • *2: for TMMK Made
License Plate Light

Symptom

Suspected Area

Link

License plate light does not illuminate

License plate light assembly

Harness or connector

-

Stop Light

Symptom

Suspected Area

Link

Left or right stop light (rear combination light assembly) does not illuminate

Rear combination light lens and body*1

Rear combination light assembly*2

Harness or connector

-

Left or right stop light (rear light assembly) does not illuminate

Rear light assembly

Harness or connector

-

All of the stop lights do not illuminate

STOP fuse

-

Stop light switch assembly

Harness or connector

-

  • *1: for TMC Made
  • *2: for TMMK Made
High Mounted Stop Light

Symptom

Suspected Area

Link

High mounted stop light does not illuminate

Center stop light set

Harness or connector

-

Back-up Light

Symptom

Suspected Area

Link

Left or right back-up light does not illuminate

Rear light assembly

Harness or connector

-

Both left and right back-up lights do not illuminate

Back-up light circuit

Turn Signal Light

Symptom

Suspected Area

Link

Left or right front turn signal light does not operate*1

Headlight ECU sub-assembly

Headlight unit assembly

Harness or connector

-

Left or right front turn signal light does not operate*2

Front turn signal light bulb

Headlight cord

Headlight ECU sub-assembly

Headlight unit assembly*3

Headlight assembly*4

Harness or connector

-

Left or right rear turn signal light does not operate

Rear combination light lens and body*3

Rear combination light assembly*4

Harness or connector

-

Left or right side turn signal light does not operate

Side turn signal light assembly

Outer rear view mirror assembly

Outer mirror control ECU assembly*5

Harness or connector

-

Turn signal lights do not operate in one direction

Turn signal switch circuit

Meter/gauge system

All turn signal lights do not operate

Turn signal switch circuit

Combination meter assembly

All turn signal lights do not flash at the correct speed

Combination meter assembly

  • *1: for LED Type Turn Signal Light
  • *2: for Bulb Type Turn Signal Light
  • *3: for TMC Made
  • *4: for TMMK Made
  • *5: w/ Seat Position Memory
Hazard Warning Signal Light

Symptom

Suspected Area

Link

Hazard warning signal lights do not operate

Hazard warning switch circuit

Combination meter assembly

Hazard warning signal switch do not flash

Harness or connector

-

Hazard warning switch assembly

Combination meter assembly

Automatic Light Control System

Symptom

Suspected Area

Link

Automatic light control system does not operate

Headlight dimmer switch circuit

Main body ECU (Multiplex network body ECU)

Light Auto Turn-off System

Symptom

Suspected Area

Link

Light auto turn-off system does not operate

Headlight dimmer switch circuit

IG signal circuit

Front door courtesy switch circuit

Main body ECU (Multiplex network body ECU)

Remote Operation Function (w/ Telematics System)

Symptom

Suspected Area

Link

Lights do not operate using remote operation function (Lighting system is normal)

Telematics system

Wiper-linked Low Beam Headlight Control System

Symptom

Suspected Area

Link

Wiper-linked low beam headlight control system does not operate

Check customize settings

Main body ECU (Multiplex network body ECU)

Outside Handle Foot Light Control

Symptom

Suspected Area

Link

All of the outside handle foot lights do not illuminate

Check customize settings

Power door lock control system

Wireless door lock control system

Smart access system with push-button start (for entry function)

Door unlock detection switch circuit

Outside handle foot light circuit

Main body ECU (Multiplex network body ECU)

Left or right outside handle foot light does not illuminate

Front door outside handle assembly

Rear door outside handle assembly

Harness or connector

-

Welcome Light Illumination Control

Symptom

Suspected Area

Link

Welcome light illumination control does not operate

Check customize settings

Main body ECU (Multiplex network body ECU)

Automatic Headlight Beam Level Control System (for LED Type Turn Signal Light)

Symptom

Suspected Area

Link

Automatic headlight beam level control system does not operate (Left Headlight)

Headlight ECU sub-assembly LH

Headlight unit assembly LH

Automatic headlight beam level control system does not operate (Right Headlight)

Headlight ECU sub-assembly RH

Headlight unit assembly RH

Initialization cannot be performed

CAN communication system

Headlight ECU sub-assembly LH

AFS (for LED Type Turn Signal Light)

Symptom

Suspected Area

Link

AFS control does not operate (Left Headlight)

Headlight ECU sub-assembly LH

Headlight unit assembly LH

AFS control does not operate (Right Headlight)

Headlight ECU sub-assembly RH

Headlight unit assembly RH

Automatic High Beam System

Symptom

Suspected Area

Link

Automatic high beam system does not operate or automatic high beam indicator does not illuminate (low beam headlights and high beam headlights are normal)

Front radar sensor system

Check Data List (Front Recognition Camera High Temperature 2)

Check automatic high beam indicator light

Check Data List (Auto H Beam STS0)

Perform Active Test (Multi Display All (White))

Turn signal switch (Automatic high beam switch)

Steering wheel switch housing

Steering sensor

Combination meter assembly

Forward recognition camera

Main body ECU (Multiplex network body ECU)

Automatic high beam switch indicator does not come ON

Refer to "Automatic High Beam Switch Indicator does not Come ON"

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