Note
Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.
If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information Click here.
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 |
|---|---|---|
| Left low beam headlight does not illuminate | Headlight unit assembly LH | |
| Headlight ECU sub-assembly LH | ||
| Right low beam headlight does not illuminate | Headlight unit assembly RH | |
| Headlight ECU sub-assembly RH | ||
| Both left and right low beam headlights do not illuminate | Headlight dimmer switch circuit | |
| Main body ECU (Multiplex network body ECU) (for LHD) | ||
| Main body ECU (Multiplex network body ECU) (for RHD) | ||
| Left high beam headlight does not illuminate | Headlight unit assembly LH | |
| Headlight ECU sub-assembly LH | ||
| Right high beam headlight does not illuminate | Headlight unit assembly RH | |
| Headlight ECU sub-assembly RH | ||
| Both left and right high beam headlights do not illuminate | Headlight dimmer switch circuit | |
| Main body ECU (Multiplex network body ECU) (for LHD) | ||
| Main body ECU (Multiplex network body ECU) (for RHD) | ||
| High Flash (passing function) does not operate (high beam headlights are normal) | Headlight dimmer switch circuit | |
| Main body ECU (Multiplex network body ECU) (for LHD) | ||
| Main body ECU (Multiplex network body ECU) (for RHD) | ||
| Left low beam headlight and high beam headlight do not illuminate | Power source circuit | |
| Headlight ECU sub-assembly LH | ||
| Right low beam headlight and high beam headlight do not illuminate | Power source circuit | |
| Headlight ECU sub-assembly RH |
| Symptom | Suspected Area | See page |
|---|---|---|
| Left clearance light does not illuminate | Clearance light/daytime running light relay circuit | |
| Headlight ECU sub-assembly LH | ||
| Right clearance light does not illuminate | Clearance light/daytime running light relay circuit | |
| Headlight ECU sub-assembly RH | ||
| Both left and right clearance lights do not illuminate | Check customize setting | |
| Headlight dimmer switch circuit | ||
| Main body ECU (Multiplex network body ECU) (for LHD) | ||
| Main body ECU (Multiplex network body ECU) (for LHD) |
| Symptom | Suspected Area | See page |
|---|---|---|
| One side taillight (rear combination light assembly) does not illuminate | Rear combination light assembly | |
| Harness or connector | - | |
| One taillight (rear light assembly) does not illuminate | Rear light assembly | |
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| License plate light does not illuminate | License plate light assembly | |
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| One side stop light (rear combination light assembly) does not illuminate | Rear combination light assembly | |
| Harness or connector | - | |
| One side stop light (rear light assembly) does not illuminate (Stop light in rear light assembly) | Rear light assembly | |
| Harness or connector | - | |
| Center stop light does not illuminate | Center stop light assembly | |
| Harness or connector | - | |
| All of the stop lights do not illuminate | STOP fuse | - |
| Stop light switch assembly | ||
| Stop light control relay assembly (for LHD) | ||
| Stop light control relay assembly (for RHD) | ||
| Harness or connector | - | |
| Emergency brake signal (stop light blink) does not operate | CAN Communication system (for LHD) | |
| CAN Communication system (for RHD) | ||
| Vehicle stability control system | ||
| Meter/gauge system |
| Symptom | Suspected Area | See page |
|---|---|---|
| One front fog light does not illuminate | Front fog light circuit | |
| Fog light assembly | ||
| Harness or connector | - | |
| Both left and right front fog lights do not illuminate (taillights are normal) | Headlight dimmer switch circuit | |
| Front fog light circuit | ||
| Main body ECU (Multiplex network body ECU) (for LHD) | ||
| Main body ECU (Multiplex network body ECU) (for RHD) |
| Symptom | Suspected Area | See page |
|---|---|---|
| One rear fog light does not illuminate | Rear fog light circuit | |
| Rear fog light assembly | ||
| Harness or connector | - | |
| Both left and right rear fog lights do not illuminate | Rear fog bulb | - |
| Headlight dimmer switch circuit | ||
| Rear fog light circuit | ||
| Main body ECU (Multiplex network body ECU) (for LHD) | ||
| Main body ECU (Multiplex network body ECU) (for RHD) |
| Symptom | Suspected Area | See page |
|---|---|---|
| One back-up light does not illuminate | Back-up light assembly | |
| Harness or connector | - | |
| Both left and right back-up lights do not illuminate (for 3UR-FE) | BKUP LP fuse | - |
| Park/neutral position switch assembly | ||
| Cowl side junction block LH (for LHD) | ||
| Cowl side junction block LH (for RHD) | ||
| Harness or connector | - | |
| Both left and right back-up lights do not illuminate (for 1VD-FTV) | BKUP LP fuse | - |
| ECU-ACC NO.1 fuse | - | |
| Park/neutral position switch assembly | ||
| Cowl side junction block LH (BK/UP LP relay) (for LHD) | ||
| Cowl side junction block LH (BK/UP LP relay) (for RHD) | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| One turn signal light does not operate (except side turn signal lights) | Headlight unit assembly | |
| Headlight ECU-sub Assembly | ||
| Harness or connector | - | |
| One side turn signal light does not operate | Side turn signal light assembly | |
| Outer rear view mirror assembly | ||
| Outer mirror control ECU assembly | ||
| Harness or connector | - | |
| Turn signal lights do not operate in one direction | Turn signal switch circuit | |
| Meter/gauge system | ||
| All turn signal lights do not operate | Turn signal switch circuit | |
| Combination meter assembly | ||
| All turn signal lights do not flash at the correct speed | Combination meter assembly |
| Symptom | Suspected Area | See page |
|---|---|---|
| Hazard warning signal lights do not operate | Hazard warning switch circuit | |
| Combination meter assembly |
| Symptom | Suspected Area | See page |
|---|---|---|
| Automatic light control system does not operate | Check DTCs | |
| Headlight dimmer switch circuit | ||
| Main body ECU (Multiplex network body ECU) (for LHD) | ||
| Main body ECU (Multiplex network body ECU) (for RHD) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Light auto turn-off system does not operate | Headlight dimmer switch circuit | |
| IG signal circuit | ||
| Door courtesy switch circuit | ||
| Main body ECU (Multiplex network body ECU) (for LHD) | ||
| Main body ECU (Multiplex network body ECU) (for RHD) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Follow me home system does not operate | IG signal circuit | |
| Headlight dimmer switch circuit | ||
| Main body ECU (Multiplex network body ECU) (for LHD) | ||
| Main body ECU (Multiplex network body ECU) (for RHD) |