LIGHTING SYSTEM PROBLEM SYMPTOMS TABLE
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 |
|---|---|---|
| "Low beam" and "High beam" do not turn on (One side) | Discharge headlight bulb | |
| Light control ECU (Headlight assembly) | ||
| Headlight signal circuit | ||
| "Low beam" and "High beam" do not turn on (Both sides) | Light control switch circuit | |
| Headlight signal circuit | ||
| Main body ECU (Instrument panel junction block assembly) | - | |
| "Flash" does not turn on (Low beam and high beam are normal) | Light control switch circuit | |
| Main body ECU (Instrument panel junction block assembly) | - | |
| Discharge headlight bulb is dark | Discharge headlight bulb | |
| Light control ECU (Headlight assembly) | ||
| When headlight dimmer switch is moved to high beam position, low beam of discharge headlights remains on, illumination area of discharge headlight does not increase (Bi-function does not work) | Light control switch circuit | |
| Headlight (HI-BEAM) circuit | ||
| Headlight assembly |
| Symptom | Suspected Area | See page |
|---|---|---|
| "Low beam" does not turn on (One side) | Headlight bulb (Low) | |
| Headlight signal circuit | ||
| "Low beam" does not turn on (Both sides) | Light control switch circuit | |
| Headlight signal circuit | ||
| Main body ECU (Instrument panel junction block assembly) | - | |
| "High beam" does not turn on (One side) | Headlight bulb (High) | |
| Headlight (HI-BEAM) circuit | ||
| "High beam" does not turn on (Both sides) | Light control switch circuit | |
| Headlight (HI-BEAM) circuit | ||
| Main body ECU (Instrument panel junction block assembly) | - | |
| "Flash" does not turn on (Low beam and high beam are normal) | Light control switch circuit | |
| Main body ECU (Instrument panel junction block assembly) | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Taillight does not turn on (All) | Light control switch circuit | |
| Main body ECU (TAIL relay) | - | |
| Taillight circuit | ||
| Front parking light does not turn on | Front parking light bulb (for Halogen Headlight) | - |
| Taillight circuit | ||
| Headlight assembly (for HID Headlight) | ||
| Headlight assembly (for Halogen Headlight) | ||
| Main body ECU (Instrument panel junction block assembly) | - | |
| Taillight does not turn on | Taillight circuit | |
| Rear combination light assembly (for Sedan) | ||
| Rear combination light assembly (for Wagon) | ||
| Rear light assembly (for Sedan) | ||
| Rear light assembly (for Wagon) | ||
| Main body ECU (Instrument panel junction block assembly) | - | |
| License plate light does not turn on | License plate light bulb | - |
| Taillight circuit | ||
| Main body ECU (Instrument panel junction block assembly) | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Rear fog light does not turn on | Rear fog light bulb | - |
| Light control switch circuit | ||
| Rear fog light circuit | ||
| Rear light assembly (for Wagon) | ||
| Main body ECU (Instrument panel junction block assembly) | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Daytime running light system does not operate | Check CAN communication system | |
| Check electric parking brake system | ||
| Light control switch circuit | ||
| Headlight signal circuit | ||
| Daytime running light bulb (for Halogen Headlight) | - | |
| Headlight assembly (for HID Headlight) | ||
| Headlight assembly (for Halogen Headlight) | ||
| Main body ECU (Instrument panel junction block assembly) | - |