LIGHTING SYSTEM PROBLEM SYMPTOMS TABLE
Tech Tips
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Use the table below to help determine the cause of the problem symptom. 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.
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Inspect the fuse and relay related to this system before inspecting the suspected areas below.
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Problem symptoms may occur if the electric power control system's functions malfunction. Follow the HOW TO PROCEED WITH TROUBLESHOOTING procedures.
| Symptom | Suspected Area | See page |
|---|---|---|
| No low beam headlight illumination | LO-beam Headlight does not Illuminate | |
| One of the low beam headlights does not illuminate | H-LP LL fuse or H-LP RL fuse | - |
| Engine room No. 2 relay block (H-LP LO relay) | - | |
| Discharge headlight bulb | ||
| Harness or connector | - | |
| Headlight control ECU | ||
| Headlight assembly | ||
| No high beam headlight illumination (except vehicles in china with a pre-crash safety system) | HI-beam Headlight does not Illuminate | |
| "LO/HI beam" headlight does not change to high beam (w/o Adaptive High Beam System) | Headlight dimmer switch assembly | |
| Windshield wiper switch assembly (Combination ECU) | ||
| Headlight assembly | ||
| Multiplex network front light ECU (Front controller) | - | |
| Engine room No. 2 relay block (H-LP LVL relay) | - | |
| Harness or connector | - | |
| "LO/HI beam" headlight does not change to High beam (w/ Adaptive High Beam System) | Headlight dimmer switch assembly | |
| Windshield wiper switch assembly (Combination ECU) | ||
| Harness or connector | - | |
| "Flash" headlight does not illuminate | Data List (HIGH FLASHER SW) | |
| Headlight dimmer switch assembly | ||
| Harness or connector | - | |
| Windshield wiper switch assembly (Combination ECU) | ||
| Headlight is dark | Headlight control ECU | |
| Discharge headlight bulb | ||
| Harness or connector | - | |
| All taillights do not illuminate (clearance lights, license plate lights and taillights) | Clearance Light does not Illuminate | |
| Clearance lights do not illuminate | Harness or connector | - |
| Headlight assembly | ||
| Clearance light unit | ||
| Light control ECU (for clearance light) | ||
| Multiplex network front light ECU (front controller) | - | |
| Taillight does not illuminate (rear combination light) | Harness or connector | - |
| Rear combination light socket and wire sub-assembly | ||
| Rear combination light assembly | ||
| Luggage room junction block (rear junction block ECU) | - | |
| Taillight does not illuminate (rear light) | Harness or connector | - |
| Rear light socket and wire | ||
| Rear light assembly | ||
| Luggage room junction block (rear junction block ECU) | - | |
| Taillight does not illuminate (license plate light) | Harness or connector | - |
| License plate light assembly | ||
| Luggage room junction block (rear junction block ECU) | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Stop light system does not illuminate | Stop Light does not Illuminate | |
| High mounted stop light does not illuminate | Stop Light does not Illuminate |
| Symptom | Suspected Area | See page |
|---|---|---|
| Fog light does not illuminate or has abnormal operation | Front Fog Light does not Illuminate |
| Symptom | Suspected Area | See page |
|---|---|---|
| Rear fog light does not illuminate or has abnormal operation | Rear Fog Light does not Illuminate |
| Symptom | Suspected Area | See page |
|---|---|---|
| All turn signal light does not illuminate | Turn Signal Light does not Illuminate | |
| Turn signal light on one side do not illuminate | Turn Signal Light does not Illuminate | |
| Turn signal light does not illuminate (front turn signal light) | Harness or connector | - |
| Front turn signal light unit | ||
| Headlight assembly | ||
| Turn signal light does not illuminate (side turn signal light) | Harness or connector | - |
| Front multiplex network door ECU | ||
| Outer mirror actuator assembly | ||
| Side turn signal light assembly | ||
| Turn signal light does not illuminate (rear combination light) | Harness or connector | - |
| Rear combination light socket and wire sub-assembly | ||
| Rear combination light assembly | ||
| Hazard warning light does not illuminate | Multi-media module receiver assembly (hazard warning signal switch) | |
| Main body ECU (driver side junction block assembly) | - | |
| Turn signal flasher assembly | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Room light does not illuminate or has abnormal operation | Room Light Control does not Operate | |
| Map light does not illuminate | Map light assembly | |
| Personal light does not illuminate or has abnormal operation | Personal Light does not Illuminate | |
| Console spot light does not illuminate | Map light assembly | |
| Vanity light does not illuminate | Vanity light | |
| Visor assembly | ||
| Map light assembly | ||
| Harness or connector | - | |
| Rear vanity light does not illuminate | Rear Vanity Light does not Illuminate | |
| Inside handle light does not illuminate | Inside Handle Light does not Illuminate | |
| Door courtesy light does not illuminate | Door Courtesy Light does not Illuminate | |
| Interior foot light does not illuminate | Interior Foot Light does not Illuminate | |
| Engine switch (illumination) does not illuminate | Engine switch | - |
| Main body ECU (driver side junction block assembly) | - | |
| Harness or connector | - | |
| Rear ashtray light does not illuminate | Active test (Ashtray Light) | |
| Bulb | - | |
| Rear multiplex network door ECU | ||
| Harness or connector | - | |
| Seat inner belt light does not illuminate | Front seat inner belt assembly | - |
| Rear seat inner belt assembly (w/ Rear Seat Inner Belt illumination) | - | |
| Luggage room junction block (rear junction block ECU) | - | |
| Main body ECU (driver side junction block assembly) | - | |
| Harness or connector | - | |
| Luggage room light does not illuminate | Luggage Room Light does not Illuminate | |
| Clock illumination does not illuminate | Clock assembly | |
| Main body ECU (driver side junction block assembly) | - | |
| Harness or connector | - | |
| Remote touch illumination does not illuminate | Remote operation switch | |
| Remote operation board | ||
| No. 1 meter ECU sub-assembly | ||
| Meter display panel | ||
| Harness or connector | - | |
| Room light switch illumination does not illuminate | Map light assembly | |
| Spot light assembly (w/o Console Box) | ||
| Console box light assembly (w/ Console Box) | ||
| No. 1 meter ECU sub-assembly | ||
| Meter display panel | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Instrument panel illumination does not turn on | Instrument Panel Illumination does not Turn On | |
| Driver Side Instrument Panel Illumination does not Turn On | ||
| Driver side instrument panel illumination does not turn on | Driver Side Instrument Panel Illumination does not Turn On | |
| Instrument panel illumination does not turn on properly | Instrument Panel Illumination does not Turn On Properly | |
| Instrument panel illumination remains on | Instrument Panel Illumination Remains On |
| Symptom | Suspected Area | See page |
|---|---|---|
| Automatic light control function does not operate | Automatic Light Control Function does not Operate |
| Symptom | Suspected Area | See page |
|---|---|---|
| Light auto turn off system does not operate normally | Main body ECU (driver side junction block assembly) | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Battery saving function does not operate | Operation check | |
| Main body ECU (driver side junction block assembly) | - | |
| Map light assembly | ||
| Luggage room junction block assembly (rear junction block ECU) | - | |
| Front multiplex network door ECU | ||
| Rear multiplex network door ECU | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Inner rear view mirror assembly indicator light remains on when the inner rear view mirror assembly AUTO switch is pressed. | Inner rear view mirror assembly | |
| Automatic high beam indicator light does not come on when the automatic high beam system is in standby mode (automatic light control system operates normally). | Perform operation check | |
| Headlight dimmer switch assembly | ||
| Harness or connector | - | |
| No. 1 meter ECU sub-assembly | ||
| Meter display panel | ||
| Main body ECU (driver side junction block assembly) | - | |
| Automatic high beam system does not operate (the system check screen is displayed on the multi-information display in the combination meter). | Check for DTCs | |
| Automatic high beam system does not operate (automatic high beam indicator light is on or off). | Active test | |
| Inner rear view mirror assembly (Camera detection malfunction*1) | ||
| Inner rear view mirror assembly (Aiming misalignment*2) | ||
| Multiplex network front light ECU (Front controller) | - | |
| Main body ECU (driver side junction block assembly) | - |
Note
*1: Camera detection malfunctions can be detected using the GTS. Under the following conditions, if the camera built into the inner rear view mirror assembly cannot detect other vehicles or lights correctly, it will stop automatic high beam control and turn off the automatic high beam indicator light:
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When the front windshield is not clear (ice, snow or frost is on the glass).
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When the front windshield is dirty (sand, mud, water stains or bugs are on the glass).
*2: Aiming misalignment of the camera can be detected using the GTS. Under the following conditions, the camera built into the rear view mirror assembly cannot adjust its center point:
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When the inner rear view mirror assembly is at an angle due to incorrect installation or damage to the camera.
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When the automatic aiming adjusting function of the mirror does not work correctly.
If the camera aiming is misaligned, check the following conditions:
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Check if the vehicle is inclined.
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Check if the windshield glass is installed correctly.
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Check if the inner rear view mirror assembly is installed correctly.
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Check if there is deformation of the camera or stay of the inner rear view mirror assembly.
| Symptom | Suspected Area | See page |
|---|---|---|
| Inner rear view mirror assembly indicator light remains on when the inner rear view mirror assembly AUTO switch is pressed. | Inner rear view mirror assembly | |
| Adaptive high beam system indicator light in combination meter does not illuminate | Operation check (confirm operation conditions) | |
| Outer mirror switch (adaptive high beam system main switch) | ||
| No. 1 meter ECU sub-assembly | ||
| Meter display panel | ||
| Headlight dimmer switch assembly | ||
| High beam indicator light in combination meter does not illuminate | No. 1 meter ECU sub-assembly | |
| Meter display panel | ||
| Headlight dimmer switch assembly | ||
| "LO/HI beam" headlight does not change to high beam or variable shade beam | High Beam or Variable Shade Beam does not Operate | |
| High beam beam headlight does not illuminate | Harness or connector | - |
| Headlight dimmer switch assembly | ||
| One of the high beam headlight does not illuminate | Bulb | - |
| Headlight assembly | ||
| Harness or connector | - | |
| Adaptive high beam system does not change to automatic beam switching adjustment (operation conditions are not met and adaptive high beam system does not operate) | Operation check (confirm operation conditions) | |
| Customize parameters (confirm customization setting) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Lane change flasher system does not operate (turn signal lights are normal) | Check for DTCs | |
| Headlight dimmer switch assembly | ||
| Windshield wiper switch assembly (Combination ECU) | ||
| Main body ECU (driver side junction block assembly) | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Daytime running light system does not operate | Headlight dimmer switch assembly | |
| Clearance light unit | ||
| Light control ECU (for clearance light) | ||
| Headlight assembly | ||
| Headlight dimmer switch assembly | ||
| Parking brake switch | - | |
| Multiplex network front light ECU (Front controller) | - | |
| Engine room No. 2 relay block (DRL relay) | - | |
| Main body ECU (driver side junction block assembly) | - | |
| Harness or connector | - | |
| CAN communication system (for LHD) | ||
| CAN communication system (for RHD) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Back-up light does not illuminate | Back-up light does not Illuminate | |
| Door mirror foot light does not illuminate | Door mirror foot light does not Illuminate |