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.
| Symptom | Suspected Area | See page |
|---|---|---|
| Only front interior light does not illuminate. | Bulb | - |
| Map light assembly | ||
| Harness or connector | - | |
| Only rear interior light does not illuminate. | Bulb | - |
| No. 1 room light assembly | ||
| Harness or connector (Including all light components that are part of the wire harness) | - | |
| Only power switch illumination does not illuminate. | Power switch illumination circuit | |
| Certification ECU (Smart key ECU assembly) | - | |
| Interior light control does not operate normally. | DOME fuse | - |
| IG signal circuit | ||
| ACC signal circuit | ||
| Door courtesy switch circuit | ||
| Door unlock detection switch circuit | ||
| Interior light circuit | ||
| Main body ECU (Multiplex network body ECU) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Only one footwell light does not illuminate. | No. 1 interior illumination light assembly | |
| Harness or connector | - | |
| Instrument panel junction block assembly | ||
| Both footwell light LH and RH do not illuminate (interior light control is normal). | Footwell light circuit | |
| Main body ECU (Multiplex network body ECU) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Vanity light does not illuminate. | Bulb | - |
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Glove box light does not illuminate. | Glove box light assembly | |
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Battery saving control does not operate. | IG signal circuit | |
| ACC signal circuit | ||
| Door courtesy switch circuit | ||
| Door unlock detection switch circuit | ||
| Interior light auto cut circuit | ||
| Main body ECU (Multiplex network body ECU) |
| Symptom | Suspected Area | See page |
|---|---|---|
| All the interior lights that receive power via the DOME CUT relay do not illuminate. (The DOME fuse is normal.) | Interior light power source circuit | |
| Main body ECU (Multiplex network body ECU) | ||
| All the interior lights that receive power via the DOME CUT relay do not illuminate. (Although the DOME fuse is replaced, the fuse breaks again.) | Map light assembly | |
| No. 1 room light assembly | ||
| No. 1 interior illumination light assembly | ||
| No. 2 room light assembly | ||
| Harness or connector | - | |
| Instrument panel junction block assembly | ||
| Main body ECU (Multiplex network body ECU) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Luggage compartment room light does not illuminate. | Bulb | - |
| No. 2 room light assembly | ||
| Door courtesy switch circuit | ||
| Harness or connector | - | |
| Main body ECU (Multiplex network body ECU) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Front personal light does not illuminate. | Bulb | - |
| Map light assembly | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Center console spot light does not illuminate. | IG signal circuit | |
| ACC signal circuit | ||
| Overhead console illumination light circuit | ||
| Main body ECU (Multiplex network body ECU) |
| Symptom | Suspected Area | See page |
|---|---|---|
| All of instrument panel illumination lights do not come on. (Taillights operate normally.) | PANEL fuse | - |
| Harness or connector | - | |
| Instrument panel junction block assembly |
| Symptom | Suspected Area | See page |
|---|---|---|
| All of lights that controlled by DOME ON/OFF switch do not come on when DOME ON/OFF switch is operated. | Interior light circuit | |
| Main body ECU (Multiplex network body ECU) |