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 |
|---|---|---|
| Left or right low beam headlight does not illuminate | H-LP LH-LO fuse or H-LP RH-LO fuse | - |
| Headlight unit | ||
| Headlight unit assembly | ||
| Semiconductor pwr integration ECU | ||
| 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) | ||
| Left or right high beam headlight does not illuminate | Headlight unit | |
| Headlight unit assembly | ||
| Semiconductor pwr integration ECU | ||
| Light control ECU | ||
| Harness or connector | - | |
| Both left and right high beam headlights do not illuminate | Headlight dimmer switch circuit | |
| High beam headlight circuit | ||
| Main body ECU (Multiplex network body ECU) | ||
| "High Flash" (passing function) does not operate (high beam headlights are normal) | Headlight dimmer switch circuit | |
| Main body ECU (Multiplex network body ECU) |
| Symptom | Suspected Area | Link |
|---|---|---|
| Left or right clearance light does not illuminate | Clearance light assembly | |
| Clearance light LED unit assembly | ||
| Harness or connector | - | |
| Both left and right clearance lights do not illuminate | Harness or connector | - |
| Instrument panel junction block assembly |
| Symptom | Suspected Area | Link |
|---|---|---|
| Left or right taillight (rear combination light assembly) do not illuminate | Rear combination light lens and body | |
| Rear combination light socket and wire | ||
| Harness or connector | - | |
| Left or right taillight (rear light assembly) does not illuminate | Rear light lens and body | |
| Rear light socket and wire | ||
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| Left or right license plate light does not illuminate | License plate light assembly | |
| Harness or connector | - | |
| Both left and right license plate lights do not illuminate | Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| Left or right stop light does not illuminate | Rear combination light lens and body | |
| Rear combination light socket and wire | ||
| 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 | ||
| Semiconductor pwr integration ECU | ||
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| Left or right front fog light does not illuminate | Fog light cord | |
| Light control LED ECU | ||
| 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) |
| Symptom | Suspected Area | Link |
|---|---|---|
| Rear fog light does not illuminate (taillights are normal) | Rear light lens and body | |
| Rear light socket and wire | ||
| Headlight dimmer switch circuit | ||
| Rear fog light circuit | ||
| Main body ECU (Multiplex network body ECU) |
| Symptom | Suspected Area | Link |
|---|---|---|
| Back-up light does not illuminate | Hybrid control system | |
| BKUP LP fuse | - | |
| BKUP LP relay | ||
| Back-up light bulb | ||
| Rear light socket and wire | ||
| Instrument panel junction block assembly | ||
| Hybrid vehicle control ECU assembly | ||
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| Left or right turn signal light does not operate (except side turn signal lights) | Front turn signal light bulb | |
| Rear turn signal light bulb | ||
| Headlight cord | ||
| Rear combination light socket and wire | ||
| Harness or connector | - | |
| Left or right side turn signal light does not operate | Side turn signal light assembly | |
| Outer rear view mirror assembly | ||
| Harness or connector | - | |
| Turn signal lights do not operate in one direction | Turn signal switch circuit | |
| Windshield wiper switch assembly | ||
| Meter / gauge system | ||
| All turn signal lights do not operate | Turn signal switch circuit | |
| Windshield wiper switch assembly | ||
| Combination meter assembly | ||
| All turn signal lights do not flash at the correct speed | Combination meter assembly |
| Symptom | Suspected Area | Link |
|---|---|---|
| Hazard warning signal lights do not operate | Hazard warning switch circuit | |
| Combination meter assembly |
| Symptom | Suspected Area | Link |
|---|---|---|
| Automatic light control system does not operate | Check DTCs | |
| Headlight dimmer switch circuit | ||
| Main body ECU (Multiplex network body ECU) |
| Symptom | Suspected Area | Link |
|---|---|---|
| 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) |
| Symptom | Suspected Area | Link |
|---|---|---|
| Daytime running light system does not operate (both left and right daytime running lights do not illuminate) | CAN communication system | |
| Headlight dimmer switch circuit | ||
| IG signal circuit | ||
| Parking brake switch circuit | ||
| Daytime running light relay circuit | ||
| Main body ECU (Multiplex network body ECU) | ||
| Left or right daytime running light does not illuminate | Clearance light assembly | |
| Clearance light LED unit assembly | ||
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| Both left and right outside handle foot lights do not illuminate | CAN communication system | |
| Power door lock control system | ||
| Wireless door lock control system | ||
| Entry and start system (for Entry Function) | ||
| Outside handle foot light circuit | ||
| Door unlock detection switch circuit | ||
| Main body ECU (Multiplex network body ECU) | ||
| Left or right outside handle foot light does not illuminate | Front door outside handle assembly | |
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| Welcome light illumination control does not operate | Wireless door lock control system | |
| Headlight dimmer switch circuit | ||
| Main body ECU (Multiplex network body ECU) |
| Symptom | Suspected Area | Link |
|---|---|---|
| Follow me home system does not operate | IG signal circuit | |
| Headlight dimmer switch circuit | ||
| Main body ECU (Multiplex network body ECU) |