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 | Link |
|---|---|---|
| Illuminated entry system does not operate. | CAN communication system (for LHD with central gateway ECU) | |
| CAN communication system (for RHD with central gateway ECU) | ||
| CAN communication system (for LHD without central gateway ECU) | ||
| CAN communication system (for RHD without central gateway ECU) | ||
| Entry and start system (for entry function) (w/ Entry and Start System) | ||
| DOME fuse | - | |
| Interior light circuit | ||
| Door unlock detection switch circuit | ||
| Door courtesy switch circuit | ||
| Back door courtesy switch circuit | ||
| IG signal circuit | ||
| ACC signal circuit | ||
| Interior light auto cut circuit | ||
| Harness or connector | - | |
| Main body ECU (Multiplex network body ECU) (for LHD) | ||
| Main body ECU (Multiplex network body ECU) (for RHD) |
| Symptom | Suspected Area | Link |
|---|---|---|
| Map light assembly does not illuminate. | Map light bulb | |
| Map light assembly | ||
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| No. 1 room light assembly does not illuminate. | No. 1 room light bulb | |
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| No. 2 room light assembly does not illuminate. | No. 2 room light bulb | |
| No. 2 room light assembly | ||
| Back door lock assembly (back door courtesy light switch) | ||
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| Vanity light assembly does not illuminate. | Vanity light bulb | - |
| Visor assembly | ||
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| Upper console panel sub-assembly (center console illumination light) does not illuminate. | Upper console panel sub-assembly (center console illumination light) | |
| Harness or connector | - |
| 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) (for LHD) | ||
| Main body ECU (Multiplex network body ECU) (for RHD) | ||
| Battery saving function (interior light auto cut function) does not operate. | Interior light auto cut circuit | |
| Main body ECU (Multiplex network body ECU) (for LHD) | ||
| Main body ECU (Multiplex network body ECU) (for RHD) |
| Symptom | Suspected Area | Link |
|---|---|---|
| Engine switch illumination does not illuminate. | CAN communication system (for LHD with central gateway ECU) | |
| CAN communication system (for RHD with central gateway ECU) | ||
| CAN communication system (for LHD without central gateway ECU) | ||
| CAN communication system (for RHD without central gateway ECU) | ||
| Headlight dimmer switch circuit | ||
| Engine switch illumination circuit | ||
| Certification ECU (Smart key ECU assembly) | - | |
| Main body ECU (Multiplex network body ECU) (for LHD) | ||
| Main body ECU (Multiplex network body ECU) (for RHD) |
| Symptom | Suspected Area | Link |
|---|---|---|
| No instrument panel illumination lights come on (taillights operate normally). | PANEL fuse | - |
| Harness or connector | - |