Toyota CH-R Service Manual: 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*1.

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  • *1: w/ Smart Key System

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.

Personal Light (Map light assembly)

Symptom

Suspected Area

Link

Personal light LH does not illuminate

Bulb

-

Map light assembly

Harness or connector

-

Personal light RH does not illuminate

Bulb

-

Map light assembly

Harness or connector

-

Room Light (No. 1 room light assembly)

Symptom

Suspected Area

Link

Room light does not illuminate

Bulb

-

Harness or connector (Including all light components that are part of the wire harness)

-

Vanity Light

Symptom

Suspected Area

Link

Vanity light LH does not illuminate

Bulb

Visor assembly LH

-

Harness or connector

-

Vanity light RH does not illuminate

Bulb

Visor assembly RH

-

Harness or connector

-

Ambient Illumination Light*1

Symptom

Suspected Area

Link

Door ambient illumination light LH does not illuminate

No. 1 interior illumination light assembly LH

Harness or connector

-

Door ambient illumination light RH does not illuminate

No. 1 interior illumination light assembly RH

Harness or connector

-

No. 1 cup holder illumination light

Instrument cluster finish panel garnish

Harness or connector

-

No. 2 cup holder illumination light

Instrument cluster finish panel center garnish

Harness or connector

-

All ambient lights do not illuminate

Ambient illumination light circuit

Main body ECU (Multiplex network body ECU)

  • *1: w/ Door ambient illumination light
Glove Box Light

Symptom

Suspected Area

Link

Glove box light does not illuminate

Glove box light assembly

Harness or connector

-

Luggage Compartment Light

Symptom

Suspected Area

Link

Luggage compartment room light does not illuminate

Bulb

-

No. 1 luggage compartment light assembly

Back door courtesy switch circuit

Harness or connector

-

Instrument panel junction block assembly

Main body ECU (Multiplex network body ECU)

Interior Light Power Source Control

Symptom

Suspected Area

Link

All the interior lights that receive power via the DOME CUT relay do not illuminate (The DOME fuse is normal)

Interior light auto cut circuit

Main body ECU (Multiplex network body ECU)

Illuminated Entry System (Interior Light Control)

Symptom

Suspected Area

Link

All interior light control functions do not operate under any condition

Interior light circuit

Main body ECU (Multiplex network body ECU)

Door open/close-linked control function does not operate when doors are opened/closed

Door courtesy switch circuit

Map light assembly

Main body ECU (Multiplex network body ECU)

Door lock/unlock-linked control function does not operate when doors are locked/unlocked

Door unlock detection switch circuit

Main body ECU (Multiplex network body ECU)

Actuation area-linked control function does not operate when registered key is brought into any exterior detection area*1

CAN communication system

Smart key system (for Entry Function)

Main body ECU (Multiplex network body ECU)

Engine switch-linked control function does not operate when engine switch is operated*1

IG signal circuit

ACC signal circuit

Main body ECU (Multiplex network body ECU)

Ignition switch-linked control function does not operate when ignition switch is operated*2

IG signal circuit

ACC signal circuit

Main body ECU (Multiplex network body ECU)

Engine switch illumination does not illuminate*1

CAN communication system

Engine switch illumination circuit

Certification ECU (Smart key ECU assembly)

  • *1: w/ Smart Key System
  • *2: w/o Smart Key System
Illuminated Entry System (Ambient Illumination Light)*1

Symptom

Suspected Area

Link

All interior light control functions do not operate under any condition

Ambient illumination light circuit

Main body ECU (Multiplex network body ECU)

Engine switch-linked control function does not operate when engine switch is operated*2

IG signal circuit

ACC signal circuit

Main body ECU (Multiplex network body ECU)

Ignition switch-linked control function does not operate when ignition switch is operated*2

IG signal circuit

ACC signal circuit

Main body ECU (Multiplex network body ECU)

  • *1: w/ Door ambient illumination light
  • *2: w/ Smart Key System
  • *3: w/o Smart Key System
Battery Saving Control

Symptom

Suspected Area

Link

Battery saving function does not operate

IG signal circuit

ACC signal circuit

Door courtesy switch circuit

Back door courtesy switch circuit

Interior light circuit

Door unlock detection switch circuit

Interior light auto cut circuit

Main body ECU (Multiplex network body ECU)

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