Note
If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.
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 |
|---|---|---|
| Left or right low beam headlight does not illuminate | H-LP LH-LO fuse or H-LP RH-LO fuse | - |
| Headlight unit | ||
| 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 (for LED Type) | Headlight unit | |
| Engine room junction block assembly | ||
| Harness or connector | - | |
| Left or right high beam headlight does not illuminate (for Bulb Type) | Bulb | - |
| Engine room junction block assembly | ||
| 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) | ||
| Left or right parking light does not illuminate | Headlight unit | |
| Instrument panel junction block assembly | ||
| Harness or connector | - | |
| Left or right front side marker light does not illuminate | Headlight unit | |
| Headlight cord | ||
| Harness or connector | - | |
| One front side marker light does not illuminate | Bulb | - |
| Headlight cord | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Left or right 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 | - | |
| Left or right taillight (rear light assembly) does not illuminate | Rear light lens and body | |
| Rear light socket and wire | ||
| Harness or connector | - | |
| Left or right 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, clearance lights, front side marker lights, rear side marker lights and license plate lights) do not illuminate | Headlight dimmer switch circuit | |
| Taillight relay circuit | ||
| Main body ECU (Multiplex network body ECU) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Left or right license plate light does not illuminate | License plate light assembly | |
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Left or right stop light does not illuminate | Rear combination light lens and body | |
| Rear combination light socket and wire sub-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 | ||
| Engine room junction block assembly | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Left or right front fog light does not illuminate | 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 | See page |
|---|---|---|
| Left or right rear fog light does not illuminate | Rear light lens and body | |
| Rear light socket and wire | ||
| Harness or connector | - | |
| 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 |
|---|---|---|
| Left or right 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) | ||
| Park/neutral position switch assembly (for U761E A/T) | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Left or right 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 (w/ Central Gateway ECU) | |
| CAN communication system (w/o Central Gateway ECU) | ||
| Headlight dimmer switch circuit | ||
| IG signal circuit | ||
| Daytime running light relay circuit | ||
| Main body ECU (Multiplex network body ECU) | ||
| Left or right daytime running light does not illuminate | Headlight unit | |
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Left or right door mirror foot light does not illuminate (w/ Reverse Shift-linked Mirror) | Bulb | - |
| Door mirror foot light circuit | ||
| Outer mirror control ECU assembly | ||
| Left or right door mirror foot light does not illuminate (w/o Reverse Shift-linked Mirror) | 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/ Central Gateway ECU) (w/ Reverse Shift-linked Mirror) | |
| CAN communication system (w/o Central Gateway ECU) (w/ Reverse Shift-linked Mirror) | ||
| 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) |