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.
Note
If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.
| 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 | - |
| Headlight cord | ||
| 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 | |
| Headlight unit assembly | ||
| Harness or connector | - | |
| Instrument panel junction block assembly | ||
| One taillight (rear combination light assembly) does not illuminate. | Rear combination light lens and body | |
| Rear combination light socket and wire sub-assembly | ||
| Harness or connector | - | |
| One taillight (rear light assembly) does not illuminate. | Rear light lens and body | |
| Rear light socket and wire | ||
| Harness or connector | - | |
| One license plate light does not illuminate. | License plate light assembly | |
| Harness or connector | - | |
| One front side marker light does not illuminate. | Bulb | - |
| Headlight cord | ||
| Harness or connector | - | |
| One rear side marker light does not illuminate. | Rear combination light lens and body | |
| Rear combination light socket and wire sub-assembly | ||
| Harness or connector | - | |
| All of the lights (taillights, parking lights, front side marker lights, rear side marker 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, front side marker lights, rear side marker lights and license plate lights) do not illuminate (Although the TAIL fuse is replaced, the fuse breaks again). | Harness or connector | - |
| License plate light assembly | ||
| Rear combination light socket and wire sub-assembly | ||
| Rear light socket and wire | ||
| Headlight cord | ||
| Headlight unit assembly | ||
| Rear combination light lens and body | ||
| Rear light lens and body |
| Symptom | Suspected Area | See page |
|---|---|---|
| One low beam headlight does not illuminate. | H-LP LH-LO fuse or H-LP RH-LO fuse | - |
| Discharge headlight bulb | ||
| Harness or connector | - | |
| Light control ECU | ||
| Headlight unit assembly | ||
| 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 | - |
| Headlight cord | ||
| 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) | ||
| Discharge headlight bulb flickers. | Discharge headlight bulb | |
| Harness or connector | - | |
| Light control ECU | ||
| Discharge headlight bulb is dark. | Discharge headlight bulb | |
| Harness or connector | - | |
| Light control ECU | ||
| One front parking light does not illuminate. | Headlight unit | |
| Headlight unit assembly | ||
| Harness or connector | - | |
| Instrument panel junction block assembly | ||
| One taillight (rear combination light assembly) does not illuminate. | Rear combination light lens and body | |
| Rear combination light socket and wire sub-assembly | ||
| Harness or connector | - | |
| One taillight (rear light assembly) does not illuminate. | Rear light lens and body | |
| Rear light socket and wire | ||
| Harness or connector | - | |
| One license plate light does not illuminate. | License plate light assembly | |
| Harness or connector | - | |
| One front side marker light does not illuminate. | Bulb | - |
| Headlight cord | ||
| Harness or connector | - | |
| One rear side marker light does not illuminate. | Rear combination light lens and body | |
| Rear combination light socket and wire sub-assembly | ||
| Harness or connector | - | |
| All of the lights (taillights, parking lights, front side marker lights, rear side marker 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, front side marker lights, rear side marker lights and license plate lights) do not illuminate (Although the TAIL fuse is replaced, the fuse breaks again). | Harness or connector | - |
| License plate light assembly | ||
| Rear combination light socket and wire sub-assembly | ||
| Rear light socket and wire | ||
| Headlight cord | ||
| Headlight unit assembly | ||
| Rear combination light lens and body | ||
| Rear light lens and body |
| Symptom | Suspected Area | See page |
|---|---|---|
| One side stop light does not illuminate. | Rear combination light socket and wire sub-assembly | |
| Rear combination light lens and body | ||
| 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 (for Halogen Fog Light) | - |
| Fog light assembly (for LED Fog Light) | ||
| 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) |
| Symptom | Suspected Area | See page |
|---|---|---|
| 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 | ||
| Daytime running light relay circuit | ||
| Main body ECU (Multiplex network body ECU) | ||
| One side daytime running light does not illuminate. | Headlight unit | |
| Headlight unit assembly | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| One door mirror foot light does not illuminate (w/ Seat Memory Position). | Bulb | - |
| Door mirror foot light circuit | ||
| Outer mirror control ECU assembly | ||
| One door mirror foot light does not illuminate (w/o Seat Memory Position). | Bulb | - |
| Door mirror foot light circuit | ||
| Main body ECU (Multiplex network body ECU) | ||
| Both left and right door mirror foot lights do not illuminate. | CAN communication system (w/ Seat Position Memory) | |
| Power door lock control system | ||
| Wireless door lock control system | ||
| Smart entry and start system (for entry function) | ||
| Door mirror foot light circuit | ||
| Door unlock detection switch circuit | ||
| Main body ECU (Multiplex network body ECU) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Welcome lights do not illuminate. | Wireless door lock control system | |
| Headlight dimmer switch circuit | ||
| Main body ECU (Multiplex network body ECU) |
| 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) |