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 |
|---|---|---|
| One low beam headlight does not illuminate. | Bulb | - |
| No. 1 integration relay | ||
| Harness or connector | - | |
| Both left and right low beam headlights do not illuminate. | Headlight dimmer switch circuit | |
| Low beam headlight circuit | ||
| Main body ECU (Multiplex network body ECU) | - | |
| One high beam headlight does not illuminate. | H-LP LH HI fuse or H-LP RH HI fuse | - |
| Bulb | - | |
| Harness or connector | - | |
| Both left and right high beam headlights do not illuminate. | H-LP HI MAIN FUSE | - |
| Headlight dimmer switch circuit | ||
| High beam headlight circuit | ||
| Main body ECU (Multiplex network body ECU) | - | |
| "High Flash" (passing function) headlight does not illuminate (high beam headlights are normal). | Headlight dimmer switch circuit | |
| Main body ECU (Multiplex network body ECU) | - | |
| One front parking light does not illuminate. | Bulb | - |
| Harness or connector | - | |
| One rear taillight does not illuminate. | Bulb | - |
| Harness or connector | - | |
| One license plate light does not illuminate. | Bulb | - |
| Harness or connector | - | |
| All of the lights (rear taillights, parking lights and license plate lights) do not illuminate. | TAIL fuse | - |
| Headlight dimmer switch circuit | ||
| Taillight relay circuit | ||
| Main body ECU (Multiplex network body ECU) | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| One low beam headlight does not illuminate. | Discharge headlight bulb | |
| No. 1 integration relay | ||
| Light control ECU | ||
| Harness or connector | - | |
| Both left and right low beam headlights do not illuminate. | Headlight dimmer switch circuit | |
| Low beam headlight circuit | ||
| Main body ECU (Multiplex network body ECU) | - | |
| One high beam headlight does not illuminate. | H-LP LH HI fuse or H-LP RH HI fuse | - |
| Bulb | - | |
| Harness or connector | - | |
| Both left and right high beam headlights do not illuminate. | H-LP HI MAIN FUSE | - |
| Headlight dimmer switch circuit | ||
| High beam headlight circuit | ||
| Main body ECU (Multiplex network body ECU) | - | |
| "High Flash" (passing function) headlight does not illuminate (high beam headlights are normal). | Headlight dimmer switch circuit | |
| Main body ECU (Multiplex network body ECU) | - | |
| One front parking light does not illuminate. | Bulb | - |
| Harness or connector | - | |
| One rear taillight does not illuminate. | Bulb | - |
| Harness or connector | - | |
| One license plate light does not illuminate. | Bulb | - |
| Harness or connector | - | |
| All of the lights (rear taillights, parking lights and license plate lights) do not illuminate. | TAIL fuse | - |
| Headlight dimmer switch circuit | ||
| Taillight relay circuit | ||
| Main body ECU (Multiplex network body ECU) | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| One side stop light does not illuminate. | Bulb | - |
| Harness or connector | - | |
| High mounted stop light does not illuminate. | Center Stop Light Set | |
| Harness or connector | - | |
| All of the lights do not illuminate. | STOP fuse | - |
| STOP LP relay | ||
| Stop light switch assembly | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| One side front fog light does not illuminate. | Bulb | - |
| Harness or connector | - | |
| Both left and right front fog lights do not illuminate (taillights are normal). | FR FOG fuse | - |
| Headlight dimmer switch circuit | ||
| Front fog light circuit | ||
| Main body ECU (Multiplex network body ECU) | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Rear fog lights do not illuminate (taillights are normal). | Bulb | - |
| RR FOG fuse | - | |
| Headlight dimmer switch circuit | ||
| Rear fog light circuit | ||
| Main body ECU (Multiplex network body ECU) | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| One back-up light does not illuminate. | Bulb | - |
| Harness or connector | - | |
| Both left and right back-up lights do not illuminate. | Hybrid control system | |
| Back-up light circuit | ||
| Power management control ECU |
| Symptom | Suspected Area | See page |
|---|---|---|
| Side turn signal light does not operate. | Side turn signal light assembly | |
| Harness or connector | - | |
| One turn signal light does not operate (except side turn signal lights). | Bulb | - |
| Harness or connector | - | |
| Turn signal lights do not operate in one direction. | Turn signal flasher assembly | |
| Headlight dimmer switch assembly (Turn signal light switch) | ||
| Harness or connector | - | |
| All turn signal lights do not operate. | ECU-IG NO. 2 fuse | - |
| TURN HAZ fuse | - | |
| Headlight dimmer switch assembly (Turn signal light switch) | ||
| Turn signal flasher assembly | ||
| Harness or connector | - | |
| All turn signal lights do not flash at the correct speed. | Bulb | - |
| Turn signal flasher assembly | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Hazard warning lights do not operate. | TURN HAZ fuse | - |
| ECU-IG NO. 2 fuse | - | |
| Hazard warning switch | ||
| Turn signal flasher assembly | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Automatic light control system does not operate. | Check DTCs | |
| Headlight dimmer switch circuit | ||
| IG signal circuit | ||
| Main body ECU (Multiplex network body ECU) | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Light auto turn-off system does not operate. | Headlight dimmer switch circuit | |
| Door courtesy switch circuit | ||
| IG signal circuit | ||
| Main body ECU (Multiplex network body ECU) | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Daytime running light system does not operate. | CAN communication system | |
| Hybrid control system | ||
| Daytime running light assembly | ||
| Headlight dimmer switch circuit | ||
| IG signal circuit | ||
| Parking brake switch circuit (*1) | ||
| Daytime running light relay circuit | ||
| Main body ECU (Multiplex network body ECU) | - | |
| The daytime running lights cannot be disabled or re-enabled.(*2) | IG signal circuit | |
| Headlight dimmer switch circuit | ||
| Parking brake switch circuit | ||
| Main body ECU (Multiplex network body ECU) | - | |
| When the daytime running lights are disabled or re-enabled, the buzzer does not sound.(*2) | CAN communication system | |
| Combination meter assembly | ||
| Main body ECU (Multiplex network body ECU) | - |
*1: Vehicles with daytime running light illumination control that uses the release of the parking brake
*2: Vehicles with daytime running light illumination control that does not use the release of the parking brake
| Symptom | Suspected Area | See page |
|---|---|---|
| Headlight beam level control does not operate. | Headlight leveling switch | |
| Headlight unit (Headlight leveling motor) | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Headlight beam level control indicator light comes on. | Check DTCs | |
| Indicator light circuit | ||
| Headlight leveling ECU assembly | ||
| Headlight beam level control does not operate (Indicator light is off). | Check the FAIL-SAFE function | |
| Headlight leveling ECU power source circuit | ||
| Headlight signal circuit | ||
| Headlight beam level control actuator circuit | ||
| Headlight unit (Headlight leveling motor) | ||
| Headlight leveling ECU assembly | ||
| Headlight beam level control system indicator light does not come on when turning the power switch on (IG). | Headlight leveling ECU power source circuit | |
| Indicator light circuit | ||
| Headlight leveling ECU assembly | ||
| Combination meter assembly | ||
| DTC information can not be detected. | Diagnosis circuit | |
| Headlight leveling ECU assembly | ||
| Initialization can not be performed. | Check DTCs | |
| LVL terminal circuit | ||
| Headlight leveling ECU assembly |
Note
Initialize the headlight leveling ECU assembly after the vehicle height changes due to replacement of the suspension or after performing such operations as removal and reinstallation or replacement of the rear height control sensor sub-assembly.
When the headlight leveling ECU assembly is replaced, initialization is also necessary.