LIGHTING SYSTEM PROBLEM SYMPTOMS TABLE
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. | H-LP LH-LO fuse or H-LP RH-LO fuse | - |
| Bulb | - | |
| 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. | Bulb | - |
| Harness or connector | - | |
| Engine room junction block assembly | ||
| 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 illuminate low beam headlights (high beam headlights are normal). | Headlight dimmer switch circuit | |
| Main body ECU (Multiplex network body ECU) | ||
| One front parking light does not illuminate. | Headlight unit | - |
| Harness or connector | - | |
| Instrument panel junction block assembly | ||
| One taillight does not illuminate. | Bulb | - |
| Harness or connector | - | |
| One license plate light does not illuminate. | License plate light assembly | |
| Harness or connector | - | |
| All of the lights (taillights, parking lights and license plate lights) do not illuminate. (TAIL fuse is normal.) |
Headlight dimmer switch circuit | |
| Taillight relay circuit | ||
| Main body ECU (Multiplex network body ECU) | ||
| All of the lights (taillights, parking lights and license plate lights) do not illuminate. (Although the TAIL fuse is replaced the fuse breaks again.) |
License plate light assembly | |
| Rear combination light assembly | ||
| Rear light assembly | ||
| Headlight assembly | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| One low beam headlight does not illuminate. | H-LP LH-LO fuse or H-LP RH-LO fuse | - |
| Bulb | - | |
| Harness or connector | - | |
| Light control ECU | ||
| 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. | Bulb | - |
| Harness or connector | - | |
| Engine room junction block assembly | ||
| 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 illuminate low beam headlights (high beam headlights are normal). | Headlight dimmer switch circuit | |
| Main body ECU (Multiplex network body ECU) | ||
| One front parking light does not illuminate. | Headlight unit | - |
| Harness or connector | - | |
| Instrument panel junction block assembly | ||
| One rear taillight does not illuminate. | Bulb | - |
| Harness or connector | - | |
| One license plate light does not illuminate. | License plate light assembly | |
| Harness or connector | - | |
| All of the lights (taillights, parking lights and license plate lights) do not illuminate. (TAIL fuse is normal.) |
Headlight dimmer switch circuit | |
| Taillight relay circuit | ||
| Main body ECU (Multiplex network body ECU) | ||
| All of the lights (taillights, parking lights and license plate lights) do not illuminate. (Although the TAIL fuse is replaced the fuse breaks again.) |
License plate light assembly | |
| Rear combination light assembly | ||
| Rear light assembly | ||
| Headlight assembly | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| One side stop light does not illuminate. | Rear combination light assembly | |
| Harness or connector | - | |
| Center stop light does not illuminate. | Center stop light set | |
| Radio setting condenser | ||
| Harness or connector | - | |
| All of the stop lights do not illuminate. | STOP fuse | - |
| Stop light switch assembly | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| One front fog light does not illuminate. | Bulb | - |
| Harness or connector | - | |
| Engine room junction block assembly | ||
| 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 | See page |
|---|---|---|
| One rear fog light does not illuminate. | Bulb | - |
| Harness or connector | - | |
| Engine room junction block assembly | ||
| Both left and right rear fog lights do not illuminate (taillights are normal). | 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. | BKUP-LP fuse | - |
| Park/neutral position switch assembly (for U660E A/T) | ||
| Park/neutral position switch assembly (for U760E A/T) | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| One turn signal light does not operate (except side turn signal lights). | Bulb | - |
| Harness or connector | - | |
| Side turn signal light does not operate. | Side turn signal light assembly | |
| Harness or connector | - | |
| Turn signal lights do not operate in one direction. | Turn signal switch circuit | |
| Combination meter assembly | ||
| Harness or connector | - | |
| 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 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) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Light auto turn-off system does not operate. | Headlight dimmer switch circuit | |
| Front door courtesy switch circuit | ||
| Rear door courtesy switch circuit | ||
| IG signal circuit | ||
| Main body ECU (Multiplex network body ECU) |