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 | Link |
|---|---|---|
| One low beam headlight does not illuminate | H-LP LH-LO fuse or H-LP RH-LO fuse | - |
| Discharge headlight bulb | ||
| Headlight light control ECU sub-assembly | ||
| Headlight unit | ||
| Semiconductor pwr integration ECU | ||
| 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 | Headlight unit | |
| Semiconductor pwr integration ECU | ||
| Harness or connector | - | |
| Both left and right high beam headlights do not illuminate | Headlight dimmer switch circuit | |
| Headlight solenoid 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 | - | |
| Headlight light control ECU sub-assembly | ||
| Discharge headlight bulb is dark | Discharge headlight bulb | |
| Harness or connector | - | |
| Headlight light control ECU sub-assembly |
| Symptom | Suspected Area | Link |
|---|---|---|
| One low beam headlight does not illuminate | H-LP LH-LO fuse or H-LP RH-LO fuse | - |
| Headlight light control ECU sub-assembly | ||
| Headlight unit | ||
| Semiconductor pwr integration ECU | ||
| 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 | Headlight light control ECU sub-assembly | |
| Headlight unit | ||
| Semiconductor pwr integration ECU | ||
| 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 illuminate low beam headlights (high beam headlights are normal) | Headlight dimmer switch circuit | |
| Main body ECU (Multiplex network body ECU) |
| Symptom | Suspected Area | Link |
|---|---|---|
| One clearance light does not illuminate | Clearance light assembly | |
| Harness or connector | - | |
| Both left and right clearance lights do not illuminate | Harness or connector | - |
| Instrument panel junction block assembly |
| Symptom | Suspected Area | Link |
|---|---|---|
| One side 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 sub-assembly | ||
| Harness or connector | - | |
| All of the lights (taillights, clearance 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, clearance lights and license plate lights) do not illuminate (TAIL fuse breaks when replaced) | License plate light assembly | |
| Rear combination light socket and wire sub-assembly | ||
| Rear light socket and wire sub-assembly | ||
| Clearance light assembly | ||
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| One license plate light does not illuminate | License plate light assembly | |
| Harness or connector | - | |
| Both left and right license plate lights do not illuminate | Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| One side 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 assembly | |
| Radio setting condenser | ||
| Harness or connector | - | |
| All of the stop lights do not illuminate | STOP fuse | - |
| Stop light switch assembly | ||
| Semiconductor pwr integration ECU | ||
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| One front fog light does not illuminate (for Standard) | Bulb | - |
| Fog light assembly | ||
| Harness or connector | - | |
| One front fog light does not illuminate (for Sport Package) | Light control ECU | |
| 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 | Link |
|---|---|---|
| Rear fog light does not illuminate (taillights are normal) | Rear light lens and body | |
| Rear light socket and wire sub-assembly | ||
| Headlight dimmer switch circuit | ||
| Rear fog light circuit | ||
| Main body ECU (Multiplex network body ECU) |
| Symptom | Suspected Area | Link |
|---|---|---|
| Back-up light does not illuminate | BKUP LP fuse | - |
| Bulb | - | |
| Rear light socket and wire sub-assembly | ||
| Back-up light circuit |
| Symptom | Suspected Area | Link |
|---|---|---|
| Both left and right back-up lights do not illuminate | BKUP LP fuse | - |
| Back-up light circuit | ||
| One back-up light does not illuminate | Bulb | - |
| Rear light socket and wire sub-assembly | ||
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| One turn signal light does not operate (except side turn signal lights) | Bulb | - |
| Headlight cord (for HID Headlight) | ||
| Headlight cord (for LED Headlight) | ||
| Headlight assembly (for HID Headlight) | ||
| Headlight assembly (for LED Headlight) | ||
| Rear combination light lens and body | ||
| Rear combination light socket and wire sub-assembly | ||
| Harness or connector | - | |
| One side turn signal light does not operate | Side turn signal light assembly | |
| Outer rear view mirror assembly | ||
| Harness or connector | - | |
| Turn signal lights do not operate in one direction | Turn signal switch circuit | |
| Windshield wiper switch assembly | ||
| Meter/gauge system | ||
| All turn signal lights do not operate | Turn signal switch circuit | |
| Windshield wiper switch assembly | ||
| Combination meter assembly | ||
| All turn signal lights do not flash at the correct speed | Combination meter assembly |
| Symptom | Suspected Area | Link |
|---|---|---|
| Hazard warning signal lights do not operate | Hazard warning switch circuit | |
| Combination meter assembly | ||
| Emergency brake signal (hazard warning signal lights blink) does not operate (w/ Emergency Brake Signal) | CAN communication system | |
| Electronically controlled brake system | ||
| Combination meter assembly |
| Symptom | Suspected Area | Link |
|---|---|---|
| Automatic light control system does not operate | Check DTCs | |
| Headlight dimmer switch circuit | ||
| Main body ECU (Multiplex network body ECU) |
| Symptom | Suspected Area | Link |
|---|---|---|
| Light auto turn-off system does not operate | Headlight dimmer switch circuit | |
| IG signal circuit | ||
| Front door courtesy switch circuit (except European Models) |
||
| Main body ECU (Multiplex network body ECU) |
| Symptom | Suspected Area | Link |
|---|---|---|
| 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 | ||
| Parking brake switch circuit | ||
| Daytime running light relay circuit | ||
| Main body ECU (Multiplex network body ECU) | ||
| One side daytime running light does not illuminate | Clearance light assembly | |
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| 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) | ||
| One door mirror foot light does not illuminate (w/ Power Mirror Control System) | Door mirror foot light circuit | |
| Outer mirror control ECU assembly | ||
| One door mirror foot light does not illuminate (w/o Power Mirror Control System) | Bulb | - |
| Harness or connector | - | |
| Outer rear view mirror assembly |
| Symptom | Suspected Area | Link |
|---|---|---|
| Welcome light illumination control does not operate | Wireless door lock control system | |
| Headlight dimmer switch circuit | ||
| Main body ECU (Multiplex network body ECU) |
| Symptom | Suspected Area | Link |
|---|---|---|
| Follow me home system does not operate | IG signal circuit | |
| Headlight dimmer switch circuit | ||
| Main body ECU (Multiplex network body ECU) |