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. | Headlight unit | |
| Main body ECU (Multiplex network body ECU) | ||
| Harness or connector | - | |
| One taillight does not illuminate. | Rear combination light assembly | |
| 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. (Though TAIL fuse has been replaced the fuse brakes again.) |
License plate light assembly | |
| Rear combination light assembly | ||
| Headlight unit | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| One low beam headlight does not illuminate. | Check DTCs | |
| Light control ECU | ||
| No. 1 integration relay | ||
| Headlight unit | ||
| Harness or connector | - | |
| Both left and right low beam headlights do not illuminate. | Check DTCs | |
| 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. | Headlight unit | |
| Main body ECU (Multiplex network body ECU) | ||
| Harness or connector | - | |
| One rear taillight does not illuminate. | Rear combination light assembly | |
| Harness or connector | - | |
| One license plate light does not illuminate. | License plate light assembly | |
| Harness or connector | - | |
| All of the lights (rear 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. (Though TAIL fuse has been replaced the fuse brakes again.) |
License plate light assembly | |
| Rear combination light assembly | ||
| Headlight unit | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| One side stop light does not illuminate. | Rear combination light assembly | |
| Harness or connector | - | |
| High mounted stop light does not illuminate. | High mounted stop light assembly | |
| Harness or connector | - | |
| All of the stop lights do not illuminate. | STOP fuse | - |
| Stop light switch assembly | ||
| Stop light control relay | ||
| Harness or connector | - | |
| All of the stop lights do not turn off. | Stop light switch assembly | |
| Stop light control relay | ||
| Brake booster with master cylinder (for LHD)*1 | ||
| Brake booster with master cylinder (for RHD)*1 | ||
| Harness or connector | - |
*1: The stop lights may always come on due to abnormality of the brake booster with master cylinder.
| Symptom | Suspected Area | See page |
|---|---|---|
| One 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 |
|---|---|---|
| One back-up light does not illuminate. | Bulb | - |
| Harness or connector | - | |
| Both left and right back-up lights do not illuminate. | Back-up light circuit |
| 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 | - | |
| Outer mirror control ECU assembly*1 | ||
| Turn signal lights do not operate in one direction. | Headlight dimmer switch assembly (Turn signal light switch) | |
| Turn signal flasher assembly | ||
| Harness or connector | - | |
| All turn signal lights do not operate. | GAUGE 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 | - |
*1: w/ Seat Memory Switch
| Symptom | Suspected Area | See page |
|---|---|---|
| Hazard warning lights do not operate. | TURN & HAZ fuse | - |
| Hazard warning switch circuit | ||
| Turn signal flasher assembly | ||
| Main body ECU (Multiplex network body ECU) |
| 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. (Light control switch is in TAIL or HEAD position) | Headlight dimmer switch circuit | |
| IG signal circuit | ||
| Main body ECU (Multiplex network body ECU) | ||
| Light auto turn-off system does not operate. (Light control switch is in AUTO position) | Headlight dimmer switch circuit | |
| Door courtesy 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 | |
| Headlight dimmer switch circuit | ||
| IG signal circuit | ||
| Daytime running light relay circuit | ||
| Main body ECU (Multiplex network body ECU) |
| Symptom | Suspected Area | See page |
|---|---|---|
| One door mirror foot light does not illuminate. | Bulb | - |
| Door mirror foot light circuit | ||
| Outer mirror control ECU assembly | ||
| Both left and right door mirror foot light do not illuminate. | CAN communication system | |
| Power door lock control system | ||
| Wireless door lock control system | ||
| 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 |
|---|---|---|
| One door mirror foot light does not illuminate. | Bulb | - |
| Outer rear view mirror assembly | ||
| Harness or connector | - | |
| Both left and right door mirror 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) | ||
| Door mirror foot light circuit | ||
| Door unlock detection switch circuit | ||
| Main body ECU (Multiplex network body ECU) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Headlight beam level control indicator light flashes. | Check DTCs | |
| Indicator light circuit | ||
| Headlight leveling ECU assembly (for LHD) | ||
| Headlight leveling ECU assembly (for RHD) | ||
| Headlight beam level control does not operate (indicator light is off). | Check the FAIL-SAFE function | |
| Check DTCs | ||
| Headlight leveling ECU power source circuit | ||
| Headlight signal circuit | ||
| Headlight beam level control actuator circuit | ||
| Speed signal circuit | ||
| Headlight leveling ECU assembly (for LHD) | ||
| Headlight leveling ECU assembly (for RHD) | ||
| Headlight beam level control system indicator light does not come on when turning the power switch on (IG). | Indicator light circuit | |
| Headlight leveling ECU assembly (for LHD) | ||
| Headlight leveling ECU assembly (for RHD) | ||
| Combination meter assembly | ||
| DTC information can not be detected. | Diagnosis circuit | |
| Headlight leveling ECU assembly (for LHD) | ||
| Headlight leveling ECU assembly (for RHD) | ||
| Initialization can not be performed. | Check DTCs | |
| LVL terminal circuit | ||
| Headlight leveling ECU assembly (for LHD) | ||
| Headlight leveling ECU assembly (for RHD) |
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.