Toyota Avalon Service & Repair 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.

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.
  • Inspect the fuses and relays related to this system before inspecting the suspected areas below.
Map Light

Symptom

Suspected Area

Link

Map light LH or map light RH does not illuminate (Other interior lights are normal)

Map light (Roof console box sub-assembly)

Map light LH and map light RH do not illuminate (Other interior lights are normal)

Map light (Roof console box sub-assembly)

Harness or connector

-

Switch illumination or shift lever illumination does not illuminate (Other interior lights are normal)

Map light (Roof console box sub-assembly)

Switch illumination and shift lever illumination do not illuminate (Other interior lights are normal)

Map light (Roof console box sub-assembly)

Harness or connector

-

Room Light

Symptom

Suspected Area

Link

Spot light LH or spot light RH does not illuminate (Other interior lights are normal)

Spot light assembly

Spot light LH and spot light RH do not illuminate (Other interior lights are normal)

Spot light assembly

Harness or connector

-

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

-

Courtesy Light

Symptom

Suspected Area

Link

Courtesy light LH does not illuminate

Bulb

Courtesy light assembly LH

Front door courtesy switch circuit

Harness or connector

-

Main body ECU (Multiplex network body ECU)

Courtesy light RH does not illuminate

Bulb

Courtesy light assembly RH

Front door courtesy switch circuit

Harness or connector

-

Main body ECU (Multiplex network body ECU)

Glove Box Light

Symptom

Suspected Area

Link

Glove box light does not illuminate

Glove box light assembly

Harness or connector

-

Console Box Light

Symptom

Suspected Area

Link

Console box light does not illuminate

Console box light (No. 5 interior illumination light sub-assembly)

Harness or connector

-

Footwell Light and Front Console Light

Symptom

Suspected Area

Link

Front footwell light LH does not illuminate

Front footwell light LH (No. 1 interior illumination light sub-assembly)

Harness or connector

-

Front footwell light RH does not illuminate

Front footwell light RH (No. 1 interior illumination light sub-assembly)

Harness or connector

-

Rear footwell light LH does not illuminate.

Rear footwell light LH (No. 6 interior illumination light sub-assembly)

Harness or connector

-

Rear footwell light RH does not illuminate

Rear footwell light RH (No. 6 interior illumination light sub-assembly)

Harness or connector

-

Front console light does not illuminate

Front console light (interior illumination light sub-assembly)

Harness or connector

-

All footwell lights and front console light do not illuminate

Harness or connector

-

Combination meter assembly

Ambient Illumination Light (w/ Mood Switch)

Symptom

Suspected Area

Link

Front door inside handle illumination light LH does not illuminate

Ambient illumination light circuit

Front door inside handle illumination light RH does not illuminate

Ambient illumination light circuit

Console light (for passenger side) does not illuminate

Ambient illumination light circuit

Console light (for driver side) does not illuminate

Ambient illumination light circuit

Cup holder light (for front side) does not illuminate

Ambient illumination light circuit

Cup holder light (for rear side) does not illuminate

Ambient illumination light circuit

All ambient illumination lights do not illuminate

Ambient illumination light circuit

Ambient light switch circuit

Instrument panel junction block assembly

Main body ECU (Multiplex network body ECU)

Luggage Compartment Light

Symptom

Suspected Area

Link

Luggage compartment light does not illuminate (Other interior lights are normal)

Bulb

No. 1 luggage compartment light assembly

Luggage compartment door courtesy switch circuit

Harness or connector

-

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

Interior light auto cut circuit

Main body ECU (Multiplex network body ECU)

Illuminated Entry System

Symptom

Suspected Area

Link

All illuminated entry system control functions do not operate under any condition

Check customize parameters (Interior Light Control)

Interior light auto cut circuit

Interior light 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

Check customize parameters (Room Light when Aprchd)

CAN communication system

Smart key system (for Entry Function)

Main body ECU (Multiplex network body ECU)

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

Check customize parameters (I/L ON W/Door Key Unlock)

Door unlock detection switch circuit

Main body ECU (Multiplex network body ECU)

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

Front door courtesy switch circuit

Rear door courtesy switch circuit

Main body ECU (Multiplex network body ECU)

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

Check customize parameters (I/L when ACC OFF)

IG signal circuit

ACC signal circuit

Main body ECU (Multiplex network body ECU)

Engine switch illumination does not illuminate

CAN communication system

Engine switch illumination circuit

Certification ECU (Smart key ECU assembly)

Ambient light dimmer control does not operate with mood switch operation

Ambient light switch circuit

Main body ECU (Multiplex network body ECU)

Battery Saving Control System

Symptom

Suspected Area

Link

Battery saving function does not operate

IG signal circuit

ACC signal circuit

Front door courtesy switch circuit

Rear door courtesy switch circuit

Luggage compartment door courtesy switch circuit

Door unlock detection switch circuit

Interior light auto cut circuit

Main body ECU (Multiplex network body ECU)

    Precaution

    Rear Door Courtesy Switch Circuit

    See More:

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