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 | - |
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| 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) | |
| Symptom | Suspected Area | Link |
|---|---|---|
| Rear dome light does not illuminate | Spot light assembly | |
| Harness or connector | - | |
| Main body ECU (Multiplex network body ECU) | |
| Symptom | Suspected Area | Link |
|---|---|---|
| Vanity light assembly LH or vanity light assembly RH does not illuminate | Bulb | |
| Visor assembly | - | |
| Harness or connector | - |
| 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) | |
| 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 | |
| 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 | - |
| 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) | |
| 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) | |
| 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 | - |
| 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) | |
| 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) | - |
| 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) | |
| 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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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
- For your information
- Pictorial index
- For safety and security
- Instrument cluster
- Operation of each component
- Driving
- Lexus Display Audio system
- Interior features
- Maintenance and care
- When trouble arises
- Vehicle specifications
- For owners
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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