Note
Before replacing the main body ECU (multiplex network body ECU) or certification ECU (smart key ECU assembly), refer to Service Bulletin.*1
The vehicle battery supplies power to the main body ECU (multiplex network body ECU) via the door control battery. Therefore, before performing this troubleshooting procedure, make sure to perform an on-vehicle inspection to confirm that the main body ECU (multiplex network body ECU) power source circuit is normal.*2
*1: w/ Smart Entry and Start System
*2: w/ Door Control Battery
Tech Tips
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.
| 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 | - |
*: w/ Shift Lever Illumination
| Symptom | Suspected Area | Link |
|---|---|---|
| Room light does not illuminate (Other interior lights are normal)*1 | Bulb | |
| Harness or connector (Including bulb holder of the room light assembly which is part of the wire harness) | - | |
| Spot light LH or spot light RH does not illuminate (Other interior lights are normal)*2 | Spot light assembly | |
| Spot light LH and spot light RH do not illuminate (Other interior lights are normal)*2 | Spot light assembly | |
| Harness or connector | - | |
| Switch illumination or rear seat armrest illumination does not illuminate (Other interior lights are normal)*3 | Spot light assembly | |
| Switch illumination and rear seat armrest illumination do not illuminate (Other interior lights are normal)*3 | Spot light assembly | |
| Harness or connector | - |
*1: w/ Room Light (for Bulb Type)
*2: w/ Room Light (for LED Type)
*3: w/ Rear Seat Armrest Illumination
| Symptom | Suspected Area | Link |
|---|---|---|
| Vanity light LH does not illuminate | Bulb | |
| Visor assembly LH | ||
| Harness or connector (Including bulb holder of the vanity light assembly that are part of the wire harness) | - | |
| Vanity light RH does not illuminate | Bulb | |
| Visor assembly RH | ||
| Harness or connector (Including bulb holder of the vanity light assembly that are part of the wire harness) | - |
| 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) |
*: w/ Courtesy Light
| Symptom | Suspected Area | Link |
|---|---|---|
| Glove box light does not illuminate | Glove box light assembly | |
| Harness or connector | - |
*: w/ Glove Box Light
| Symptom | Suspected Area | Link |
|---|---|---|
| Front console light does not illuminate | Front console light (No. 2 interior illumination light sub-assembly) | |
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| Footwell light LH does not illuminate | Footwell light circuit | |
| Instrument panel junction block assembly | ||
| Footwell light RH does not illuminate | Footwell light circuit | |
| Instrument panel junction block assembly | ||
| Footwell light LH and RH do not illuminate | Footwell light circuit | |
| Instrument panel junction block assembly | ||
| Main body ECU (Multiplex network body ECU) |
*: w/ Footwell Light
| Symptom | Suspected Area | Link |
|---|---|---|
| Instrument panel ambient illumination light does not illuminate | Ambient illumination light circuit | |
| Harness or connector | - | |
| Main body ECU (Multiplex network body ECU) |
*: w/ Instrument Panel Ambient Illumination Light
| Symptom | Suspected Area | Link |
|---|---|---|
| Front door inside handle illumination light LH does not illuminate*1 | Inside handle illumination light circuit | |
| Front door inside handle illumination light RH does not illuminate*1 | Inside handle illumination light circuit | |
| Rear door inside handle illumination light LH does not illuminate*2 | Inside handle illumination light circuit | |
| Rear door inside handle illumination light RH does not illuminate*2 | Inside handle illumination light circuit | |
| All inside handle illumination lights do not illuminate | Inside handle illumination light circuit | |
| Main body ECU (Multiplex network body ECU) |
*1: w/ Front Door Inside Handle Illumination Light
*2: w/ Rear Door Inside Handle Illumination 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) |
| 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) |
| Symptom | Suspected Area | Link |
|---|---|---|
| All illuminated entry system control functions do not operate under any condition | 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*1 | CAN communication system | |
| Smart entry and start 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 | 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*1 | 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) | - | |
| 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) | ||
| Ignition key cylinder light does not illuminate*2 | Interior light circuit | |
| Main body ECU (Multiplex network body ECU) |
*1: w/ Smart Entry and Start System
*2: w/o Smart Entry and Start 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) |