Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

NOTICE:

Before replacing the main ECU (multiplex network body ECU), refer to Service Bulletin.

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.

Front Map Light

Symptom

Suspected Area

Link

Front map light LH or front map light RH does not illuminate

Map light assembly

Harness or connector

-

Front Dome Light

Symptom

Suspected Area

Link

Front dome light does not illuminate

Interior light switch signal circuit

Map light assembly

Harness or connector

-

Main body ECU (Multiplex network body ECU)

Rear Interior Light

Symptom

Suspected Area

Link

Rear dome light does not illuminate

Spot light assembly

Harness or connector

-

Main body ECU (Multiplex network body ECU)

Vanity Light

Symptom

Suspected Area

Link

Vanity light assembly LH or vanity light assembly RH does not illuminate

Bulb

Visor assembly

-

Harness or connector

-

Door Courtesy Light

Symptom

Suspected Area

Link

Courtesy light assembly LH or courtesy light assembly RH does not illuminate

Bulb

-

Courtesy light assembly

Door courtesy switch circuit

Harness or connector

-

Main body ECU (Multiplex network body ECU)

Scuff Light (w/ Scuff Light)

Symptom

Suspected Area

Link

Scuff Light LH or scuff Light RH does not illuminate

Front door scuff plate

Harness or connector

-

All scuff lights do not illuminate

Interior light circuit

Ambient Illumination Light

Symptom

Suspected Area

Link

Front door ambient illumination light LH or front door ambient illumination light RH does not illuminate*1

Front door trim board sub-assembly

Harness or connector

-

Rear door ambient illumination light LH or rear door ambient illumination light RH does not illuminate*1

Rear door trim board sub-assembly

Harness or connector

-

Instrument panel ambient illumination light does not illuminate*2

Interior illumination light sub-assembly

Harness or connector

-

Ambient illumination light circuit

Main body ECU (Multiplex network body ECU)

All ambient lights do not illuminate*1, *2

Ambient illumination light circuit

Main body ECU (Multiplex network body ECU)

*1: w/ Door ambient illumination light

*2: w/ Instrument panel 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 Room Light

Symptom

Suspected Area

Link

Luggage compartment room light LH, luggage compartment room light RH or luggage compartment room light (Back door) does not illuminate

No. 1 luggage compartment light assembly

Harness or connector

-

All luggage compartment room light do not illuminate

Back door courtesy switch circuit

Multiplex network door ECU

Main body ECU (Multiplex network body ECU)

Instrument Panel Box Light and Footwell Light

Symptom

Suspected Area

Link

Footwell light LH or footwell light RH does not illuminate

No. 1 interior illumination light assembly(Footwell light)

Harness or connector

-

Instrument panel box light does not illuminate

No. 1 interior illumination light assembly(Instrument panel box light)

Harness or connector

-

Footwell light LH, footwell light RH and instrument panel box light does not illuminate

Instrument panel box light and footwell light circuit

Main body ECU (Multiplex network body ECU)

Console Box Light

Symptom

Suspected Area

Link

Console Box light does not illuminate

No. 1 interior illumination light assembly(Console box light front)

No. 1 interior illumination light assembly(Console box light rear)

Harness or connector

-

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 switch signal circuit

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

CAN communication system

Smart access system with push-button start(for Entry Function)

Main body ECU (Multiplex network body ECU)

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

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)

-

Illuminated Entry System (Ambient Illumination Light)

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

IG signal circuit

ACC signal circuit

Main body ECU (Multiplex network body ECU)

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

Multiplex network door ECU

Main body ECU (Multiplex network body ECU)

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