Note
When replacing the body ECU, be sure to initialize the automatic light control system.
As the door control battery is installed between the vehicle battery and body ECU, first perform the inspections to confirm that there are no malfunctions in the power source circuit for the body ECU before performing this troubleshooting procedure.
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, relays and bulbs related to this system before inspecting the suspected areas below.
| Symptom | Suspected Area | Link |
|---|---|---|
| Illuminated entry system does not operate normally | Smart entry and start system (for Entry Function) | |
| Light cut relay (DOME CUT) | ||
| Front door courtesy light switch assembly | ||
| Rear door courtesy light switch assembly | ||
| Front door lock assembly | ||
| Rear door lock assembly | ||
| Back door lock assembly | ||
| Harness or connector | - | |
| Instrument panel junction block assembly | ||
| Body ECU (for LHD) | ||
| Body ECU (for RHD) | ||
| Only engine switch illumination does notilluminate*1 | Engine switch illumination circuit | |
| Harness or connector | - | |
| Body ECU (for LHD) | ||
| Body ECU (for RHD) | ||
| Certification ECU (smart key ECU assembly) | - | |
| Only ignition key cylinder light does notilluminate*2 | Transponder key coil | |
| Harness or connector | - | |
| Body ECU (for LHD) | ||
| Body ECU (for RHD) | ||
| Map light does not illuminate (The room light illuminates) | Light cut relay (DOME CUT) | |
| Map light assembly | ||
| Body ECU (for LHD) | ||
| Body ECU (for RHD) | ||
| Harness or connector | - |
*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 | Front door courtesy light switch assembly | |
| Rear door courtesy light switch assembly | ||
| Back door lock assembly | ||
| Instrument panel junction block assembly | ||
| Harness or connector | - | |
| Body ECU (for LHD) | ||
| Body ECU (for RHD) |
| Symptom | Suspected Area | Link |
|---|---|---|
| Map light does not illuminate | Map light assembly | |
| Front door courtesy light switch assembly | ||
| Rear door courtesy light switch assembly | ||
| Back door lock assembly | ||
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| Spot light does not illuminate | Spot light assembly | |
| Front door courtesy light switch assembly | ||
| Rear door courtesy light switch assembly | ||
| Back door lock assembly | ||
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| No. 1 room light does not illuminate | No. 1 room light assembly | |
| Front door courtesy light switch assembly | ||
| Rear door courtesy light switch assembly | ||
| Back door lock assembly | ||
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| Glove box light assembly does not illuminate. | Glove box light assembly | - |
| 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 |
|---|---|---|
| Door courtesy light does not illuminate. | Door courtesy bulb (for Front Door) | |
| Door courtesy bulb (for Rear Door) | ||
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| No instrument panel illumination comes on | Headlight dimmer switch assembly | |
| Harness or connector | - |