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 bulb related to this system before inspecting the suspected areas below.
If the main body ECU (multiplex network body ECU) is replaced, refer to the Service Bulletin.
As the door control battery is installed between the vehicle battery and main body ECU (multiplex network body ECU), first perform the inspections in On-vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (multiplex network body ECU) before performing this troubleshooting procedure.
| Symptom | Suspected Area | Link |
|---|---|---|
| Illuminated entry system does not operate. | CAN communication system (for LHD) | |
| CAN communication system (for RHD) | ||
| Smart entry and start system (for Entry Function) | ||
| Interior light auto cut circuit | Click here | |
| Interior light circuit | ||
| Interior light switch signal circuit* | ||
| Door unlock detection switch circuit | ||
| Door courtesy switch circuit | ||
| Back door courtesy switch circuit | ||
| IG signal circuit | ||
| ACC signal circuit | ||
| Harness or connector | - | |
| Main body ECU (Multiplex network body ECU) |
*: for LED Type
| Symptom | Suspected Area | Link |
|---|---|---|
| Only the interior illumination lights do not illuminate when the integration control and panel assembly is operated. | Ceiling color illumination switch circuit | |
| Room light control relay | ||
| Neither of the interior illumination lights can be dimmed when the integration control and panel assembly is operated. | Ceiling color illumination switch circuit | Click here |
| Room light control relay | ||
| Neither of the interior illumination lights change color when the integration control and panel assembly is operated. | Ceiling color illumination switch circuit | Click here |
| Room light control relay | Click here | |
| Neither of the interior illumination lights can be turned off when the integration control and panel assembly is operated. | Ceiling color illumination switch circuit | Click here |
| Room light control relay | Click here | |
| Only the interior illumination lights do not illuminate, dim, change color or turn off when the multi-information display is operated. | CAN communication system (for LHD) | |
| CAN communication system (for RHD) | ||
| Meter / Gauge System | ||
| Only the interior illumination lights do not illuminate when the integration control and panel assembly or multi-information display is operated. | CAN communication system (for LHD) | |
| CAN communication system (for RHD) | ||
| Room light control relay | Click here | |
| Only the right side interior illumination light does not illuminate. | Ceiling color illumination circuit | |
| Room light control relay | Click here | |
| Only the left side interior illumination light does not illuminate. | Ceiling color illumination circuit | |
| Room light control relay | Click here | |
| Neither of the interior illumination lights can dim, change color or turn off when the integration control and panel assembly or multi-information display is operated. | Room light control relay | Click here |
| Both of the interior illumination lights have certain colors that do not illuminate. | Room light control relay | Click here |
| The right side interior illumination light has certain colors that do not illuminate. | Ceiling color illumination circuit | |
| Room light control relay | Click here | |
| The left side interior illumination light has certain colors that do not illuminate. | Ceiling color illumination circuit | |
| Room light control relay |
| Symptom | Suspected Area | Link |
|---|---|---|
| None of the spot light assemblies illuminate. | CAN communication system (for LHD)* | |
| CAN communication system (for RHD)* | ||
| Harness or connector | - | |
| Room light control relay* | ||
| Spot light assembly RH (for Rear No. 1 Seat) does not illuminate. | Personal light switch circuit* | |
| Personal light circuit* | ||
| Spot light assembly RH* | ||
| Harness or connector | - | |
| Spot light assembly RH (for Rear No. 2 Seat) does not illuminate. | Personal light switch circuit* | Click here |
| Personal light circuit* | ||
| Spot light assembly RH* | ||
| Harness or connector | - | |
| Spot light assembly LH (for Rear No. 1 Seat) does not illuminate. | Personal light switch circuit* | |
| Personal light circuit* | ||
| Spot light assembly LH* | ||
| Harness or connector | - | |
| Spot light assembly LH (for Rear No. 2 Seat) does not illuminate. | Personal light switch circuit* | |
| Personal light circuit* | ||
| Spot light assembly LH* | ||
| Harness or connector | - | |
| None of the spot light assemblies dim.* | Room light control relay | |
| Spot light assembly RH (for Rear No. 1 Seat) does not dim.* | Room light control relay | |
| Spot light assembly RH (for Rear No. 2 Seat) does not dim.* | Room light control relay | |
| Spot light assembly LH (for Rear No. 1 Seat) does not dim.* | Room light control relay | |
| Spot light assembly LH (for Rear No. 2 Seat) does not dim.* | Room light control relay | |
| Spot light assembly RH (for Rear No. 1 Seat) does not turn off.* | Personal light switch circuit | |
| Personal light circuit | ||
| Spot light assembly RH | ||
| Spot light assembly RH (for Rear No. 2 Seat) does not turn off.* | Personal light switch circuit | |
| Personal light circuit | ||
| Spot light assembly RH | ||
| Spot light assembly LH (for Rear No. 1 Seat) does not turn off.* | Personal light switch circuit | |
| Personal light circuit | ||
| Spot light assembly LH | ||
| Spot light assembly LH (for Rear No. 2 Seat) does not turn off.* | Personal light switch circuit | |
| Personal light circuit | ||
| Spot light assembly LH | ||
| Lights do not turn off through multi-information display operation.* | CAN communication system (for LHD) | |
| CAN communication system (for RHD) | ||
| Meter / gauge system | ||
| Entering lounge mode through multi-information display operation does not dim the spot light assemblies.* | CAN communication system (for LHD) | |
| CAN communication system (for RHD) | ||
| Meter / gauge system | ||
| Room light control relay |
*: for LED Type
| Symptom | Suspected Area | Link |
|---|---|---|
| No. 2 spot light assembly RH does not illuminate. | Harness or connector | - |
| No. 2 spot light assembly RH | ||
| Rear power seat switch RH | ||
| Rear seat climate control ECU RH | ||
| No. 2 spot light assembly LH does not illuminate. | Harness or connector | - |
| No. 2 spot light assembly LH | ||
| Rear power seat switch LH | ||
| Rear seat climate control ECU LH | ||
| No. 2 spot light assembly RH does not dim. | Harness or connector | - |
| Rear power seat switch RH | ||
| Rear seat climate control ECU RH | ||
| No. 2 spot light assembly LH does not dim. | Harness or connector | - |
| Rear power seat switch LH | ||
| Rear seat climate control ECU LH | ||
| No. 2 spot light assembly RH does not turn off. | Harness or connector | - |
| Rear power seat switch RH | ||
| Rear seat climate control ECU RH | ||
| No. 2 spot light assembly LH does not turn off. | Harness or connector | - |
| Rear power seat switch LH | ||
| Rear seat climate control ECU LH |
| Symptom | Suspected Area | Link |
|---|---|---|
| No. 1 luggage compartment light assembly does not illuminate. | No. 1 luggage compartment light bulb | |
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| Vanity light assembly does not illuminate. | Vanity light bulb | |
| Visor assembly | ||
| Harness or connector (including bulb holder) | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| No instrument panel illumination lights come on. | Harness or connector | - |
| No. 1 interior illumination light assembly RH | for RHD: Click here for LHD: Click here |
|
| No. 1 interior illumination light assembly LH | for LHD: Click here for RHD: Click here |
|
| Junction block assembly LH | ||
| Main body ECU (Multiplex network body ECU) | Click here |
| Symptom | Suspected Area | Link |
|---|---|---|
| Battery saving function (basic function) does not operate. | Door courtesy switch circuit | |
| Back door courtesy switch circuit | ||
| IG signal circuit | ||
| Harness or connector | - | |
| Main body ECU (Multiplex network body ECU) | ||
| Battery saving function (interior light auto cut function) does not operate. | Interior light auto cut circuit | |
| Main body ECU (Multiplex network body ECU) |
| Symptom | Suspected Area | Link |
|---|---|---|
| Engine switch illumination does not illuminate. | CAN communication system (for LHD) | |
| CAN communication system (for RHD) | ||
| Headlight dimmer switch circuit | ||
| Engine switch illumination circuit | ||
| Certification ECU (Smart key ECU assembly) | - | |
| Main body ECU (Multiplex network body ECU) |
| Symptom | Suspected Area | Link |
|---|---|---|
| No instrument panel illumination lights come on (taillights operate normally). | Harness or connector | - |