Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Problem Symptoms Table

Toyota Corolla Cross (2022-2024) Service Manual / Vehicle Exterior / Lighting (ext) / Lighting System (w/ Afs) / Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

NOTICE:

  • Before replacing the main body ECU (multiplex network body ECU) or certification ECU (smart key ECU assembly), refer to Registration.
  • 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.

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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.
  • When replacing the combination meter assembly, update the ECU security key.

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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 unit assembly LH

Headlight ECU sub-assembly LH

Right low beam headlight does not illuminate

Headlight unit assembly RH

Headlight ECU sub-assembly RH

Left low beam headlight does not turn off

Harness or connector (Headlight ECU sub-assembly LH (HEDL terminal) - Main body ECU (Multiplex network body ECU) (HDL terminal))

-

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 unit assembly LH

Headlight ECU sub-assembly LH

Right low beam headlight and high beam headlight do not illuminate

Headlight unit assembly RH

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

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 *1

Headlight dimmer switch circuit

Main body ECU (Multiplex network body ECU)

Left clearance light flicker

Headlight ECU sub-assembly LH

Right parking light/daytime running light flicker

Headlight ECU sub-assembly RH

  • *1: for vehicles with customize setting "DRL Function"
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)

Taillight

Symptom

Suspected Area

Link

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

Rear combination light assembly

Harness or connector

-

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

Rear light assembly

Harness or connector

-

All of the taillights and license plate lights do not illuminate

Headlight dimmer switch circuit

Taillight relay circuit

Main body ECU (Multiplex network body ECU)

License Plate Light

Symptom

Suspected Area

Link

License plate light does not illuminate

License plate light bulb

License plate light assembly

Harness or connector

-
Stop Light

Symptom

Suspected Area

Link

Left or right stop light does not illuminate

Rear combination light assembly

Harness or connector

-

All of the stop lights do not illuminate

STOP fuse

-

Stop light switch assembly

Harness or connector

-
High Mounted Stop Light

Symptom

Suspected Area

Link

High mounted stop light does not illuminate

Center stop light assembly

Harness or connector

-
Front Fog Light (w/ Front Fog Light)

Symptom

Suspected Area

Link

Left or right front fog light does not illuminate

Fog light LED

-

Fog light assembly

Harness or connector

-

Left or right front fog light does not illuminate

Headlight dimmer switch circuit

Front fog light circuit

Main body ECU (Multiplex network body ECU)

Back-up Light

Symptom

Suspected Area

Link

Left or right back-up light does not illuminate

Back-up light bulb

Rear light assembly

Harness or connector

-

Both left and right back-up lights do not illuminate (for HEV Model)

Back-up light circuit

Both left and right back-up lights do not illuminate (for Gasoline Model)

BKUP LP fuse

-

Park/neutral position switch assembly (for 2WD)

Park/neutral position switch assembly (for AWD)

Harness or connector

-
Turn Signal Light

Symptom

Suspected Area

Link

Left or right front turn signal light does not operate

Front turn signal light LED

-

Headlight ECU sub-assembly

Harness or connector

-

Left or right side turn signal light does not operate

Side turn signal light assembly

Outer rear view mirror assembly

Harness or connector

-

Left or right rear turn signal light does not operate (rear combination light assembly)

Rear combination light assembly

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

Hazard Warning Signal Light

Symptom

Suspected Area

Link

Hazard warning signal lights do not operate

Hazard warning switch circuit

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)

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)

Wiper-linked Low Beam Headlight Control System

Symptom

Suspected Area

Link

Wiper-linked low beam headlight control system does not operate

Main body ECU (Multiplex network body ECU)

Automatic Headlight Beam Level Control System

Symptom

Suspected Area

Link

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

Headlight unit assembly LH

Headlight ECU sub-assembly LH

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

Headlight unit assembly RH

Headlight ECU sub-assembly RH

Both left and right automatic headlight beam level control system does not operate

Headlight ECU sub-assembly LH

CAN communication system (for HEV Model)

CAN communication system (for Gasoline Model)

Initialization cannot be performed

Headlight ECU sub-assembly LH

AFS

Symptom

Suspected Area

Link

Wiper-linked low beam headlight control system does not operate

Headlight unit assembly LH

Headlight ECU sub-assembly LH

AFS control does not operate (Right Headlight)

Headlight unit assembly RH

Headlight ECU sub-assembly RH

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