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 |
|---|---|---|
| Illuminated entry system does not operate. | DOME fuse | - |
| Main body ECU | ||
| Harness or connector | - | |
| Illuminated entry system does not operate with door opening or closing operation. | Door courtesy switch circuit | |
| Main body ECU | ||
| Illuminated entry system does not operate with door lock or unlock operation. | Door unlock detection switch circuit | |
| Main body ECU | ||
| Illuminated entry system does not operate with power switch*1 or ignition switch*2 operation. | IG signal circuit | |
| ACC signal circuit | ||
| Main body ECU | ||
| Power switch illumination does not illuminate.*1 | CAN communication system (w/ Toyota Safety Sense) | |
| CAN communication system (w/o Toyota Safety Sense) | ||
| Power switch illumination circuit | ||
| Certification ECU (Smart key ECU assembly) | ||
| Main body ECU | ||
| Map light assembly does not operate. | Interior light circuit | |
| Main body ECU | ||
| Harness or connector | - | |
| No. 1 interior illumination light assembly does not operate.*3 | Footwell light circuit | |
| Main body ECU | ||
| Harness or connector | - |
*1: w/ Power Switch
*2: w/o Power Switch
*3: w/ Foot Light
| Symptom | Suspected Area | See page |
|---|---|---|
| Map light assembly does not illuminate. | DOME fuse | - |
| Bulb | - | |
| Map light assembly | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| No. 2 room light assembly does not illuminate. | DOME fuse | - |
| Bulb | - | |
| Door courtesy switch circuit | ||
| Main body ECU | ||
| Instrument panel junction block assembly | - | |
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| No. 1 interior illumination light assembly on one side does not illuminate. | No. 1 interior illumination light assembly LH | |
| No. 1 interior illumination light assembly RH | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Vanity light assembly does not illuminate. | ACC fuse | - |
| Vanity light assembly LH | ||
| Vanity light assembly RH | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Battery saving function does not operate. | Door courtesy switch circuit | |
| IG signal circuit | ||
| Main 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 | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| All the interior lights that receive power via the DOME relay do not illuminate. (The DOME fuse is normal.) | Interior light auto cut circuit | |
| Interior Light Circuit | ||
| Main body ECU | ||
| All the interior lights that receive power via the DOME relay do not illuminate. (Although the DOME fuse is replaced, the fuse breaks again.) | Map Light Assembly | |
| No. 1 Interior Illumination Light Assembly*1 | ||
| No. 2 Room Light Assembly | ||
| Harness or connector | - | |
| Main body ECU |
*1: w/ Foot Light
| Symptom | Suspected Area | See page |
|---|---|---|
| Interior light auto cut system does not operate normally | Interior light auto cut circuit | |
| Interior Light Circuit | ||
| Door Courtesy Switch Circuit | ||
| Door Unlock Detection Switch Circuit | ||
| Main body ECU |