LIGHTING SYSTEM PROBLEM SYMPTOMS TABLE
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 |
|---|---|---|
| Low beam headlight does not turn on (One side) | H-LP LH-LO fuse or H-LP RH-LO | - |
| Headlight bulb (Low) | ||
| Harness or connector | - | |
| Headlight unit assembly | ||
| Low beam headlight does not turn on (Both sides) | Light control switch circuit | |
| Headlight signal circuit | ||
| Harness or connector | - | |
| Main body ECU (multiplex network body ECU [for LHD]) | ||
| Main body ECU (multiplex network body ECU [for RHD]) | ||
| High beam headlight does not turn on (One side) | H-LP LH-HI fuse or H-LP RH-HI | - |
| Headlight bulb (High) | ||
| Harness or connector | - | |
| Headlight unit assembly | ||
| High beam headlight does not turn on (Both sides) | Light control switch circuit | |
| Headlight (HI-BEAM) circuit | ||
| Harness or connector | - | |
| Main body ECU (multiplex network body ECU [for LHD]) | ||
| Main body ECU (multiplex network body ECU [for RHD]) | ||
| Flash does not turn on (Low beam and high beam are normal) | Light control switch circuit | |
| Main body ECU (multiplex network body ECU [for LHD]) | ||
| Main body ECU (multiplex network body ECU [for RHD]) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Low beam headlight does not turn on (One side) | H-LP LH-LO fuse or H-LP RH-LO | - |
| Headlight unit assembly | ||
| Harness or connector | - | |
| Low beam headlight does not turn on (Both sides) | Light control switch circuit | |
| Headlight signal circuit | ||
| Harness or connector | - | |
| Main body ECU (multiplex network body ECU [for LHD]) | ||
| Main body ECU (multiplex network body ECU [for RHD]) | ||
| High beam headlight does not turn on (One side) | H-LP LH-HI fuse or H-LP RH-HI | - |
| Headlight bulb (High) | - | |
| Harness or connector | - | |
| Headlight unit assembly | ||
| High beam headlight does not turn on (Both sides) | Light control switch circuit | |
| Headlight (HI-BEAM) circuit | ||
| Harness or connector | - | |
| Main body ECU (multiplex network body ECU [for LHD]) | ||
| Main body ECU (multiplex network body ECU [for RHD]) | ||
| Flash does not turn on (Low beam and high beam are normal) | Light control switch circuit | |
| Main body ECU (multiplex network body ECU [for LHD]) | ||
| Main body ECU (multiplex network body ECU [for RHD]) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Low beam headlight does not turn on (One side) | H-LP LH-LO fuse or H-LP RH-LO | - |
| Harness or connector | - | |
| Headlight unit assembly | ||
| Low beam headlight does not turn on (Both sides) | Light control switch circuit | |
| Headlight signal circuit | ||
| Harness or connector | - | |
| Main body ECU (multiplex network body ECU [for LHD]) | ||
| Main body ECU (multiplex network body ECU [for RHD]) | ||
| High beam headlight does not turn on (One side) | H-LP LH-HI fuse or H-LP RH-HI | - |
| Harness or connector | - | |
| Headlight unit assembly | ||
| High beam headlight does not turn on (Both sides) | Light control switch circuit | |
| Headlight (HI-BEAM) circuit | ||
| Harness or connector | - | |
| Main body ECU (multiplex network body ECU [for LHD]) | ||
| Main body ECU (multiplex network body ECU [for RHD]) | ||
| Flash does not turn on (Low beam and high beam are normal) | Light control switch circuit | |
| Main body ECU (multiplex network body ECU [for LHD]) | ||
| Main body ECU (multiplex network body ECU [for RHD]) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Taillight does not turn on (All) | Light control switch circuit | |
| Taillight circuit | ||
| Only one clearance lights does not turn on (for Halogen Type Clearance Light) | Clearance light bulb | - |
| Headlight unit assembly | ||
| Harness or connector | - | |
| Only one clearance lights does not turn on (for LED Type Clearance Light) | Headlight unit assembly (for Halogen Headlight and LED Headlight) | |
| Headlight unit assembly (for LED Headlight) | ||
| Harness or connector | - | |
| Only one taillight does not turn on | Taillight bulb (for Double Swing Out Type) | - |
| Rear combination light assembly (except Double Swing Out Type) | ||
| Rear light assembly (except Double Swing Out Type) | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Light auto turn off system does not operate | Light control switch circuit | |
| Engine switch (for 1GR-FE) (except Double Swing Out Type) | ||
| Engine switch (for 1UR-FE) (except Double Swing Out Type) | ||
| Engine switch (for 3UR-FE) (except Double Swing Out Type) | ||
| Engine switch (for 1VD-FTV) (except Double Swing Out Type) | ||
| Ignition switch (for 1GR-FE) (for Double Swing Out Type) | ||
| Ignition switch (for 1VD-FTV) (for Double Swing Out Type) | ||
| Door courtesy switch circuit | ||
| Main body ECU (multiplex network body ECU [for LHD]) | ||
| Main body ECU (multiplex network body ECU [for RHD]) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Battery saving function (basic function) does not operate | Door courtesy switch circuit | |
| Harness or connector | - | |
| Main body ECU (multiplex network body ECU [for LHD]) | ||
| Main body ECU (multiplex network body ECU [for RHD]) | ||
| Battery saving function (interior light auto cut function) does not operate (w/ Dome Cut Relay) | DOME CUT relay (cowl side junction block LH) | - |
| Harness or connector | - | |
| Main body ECU (multiplex network body ECU [for LHD]) | ||
| Main body ECU (multiplex network body ECU [for RHD]) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Front fog light does not turn on | Light control switch circuit | |
| Front fog light circuit | ||
| Harness or connector | - | |
| Main body ECU (multiplex network body ECU [for LHD]) | ||
| Main body ECU (multiplex network body ECU [for RHD]) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Rear fog light does not turn on (All) | Light control switch circuit | |
| Rear fog light circuit | ||
| Main body ECU (multiplex network body ECU [for LHD]) | ||
| Main body ECU (multiplex network body ECU [for RHD]) | ||
| Only one rear fog light does not turn on | Rear fog light bulb | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| No turn signal lights operate (hazard warning lights are normal) | Meter/gauge system |
| Symptom | Suspected Area | See page |
|---|---|---|
| Hazard warning signal lights does not operate (turn signal lights are normal) | Harness or connector | - |
| Hazard warning signal switch circuit | ||
| Combination meter assembly | ||
| Emergency brake signal (hazard warning light blink) does not operate (w/ Emergency Brake Signal) | CAN communication system (for LHD with Central Gateway ECU) | |
| CAN communication system (for LHD without Central Gateway ECU) | ||
| CAN communication system (for RHD with Central Gateway ECU) | ||
| CAN communication system (for RHD without Central Gateway ECU) | ||
| Vehicle stability control system | ||
| Combination meter assembly |
| Symptom | Suspected Area | See page |
|---|---|---|
| Stop light does not operate (All) | STOP fuse | - |
| Harness or connector | - | |
| Stop light switch assembly | ||
| Stop light control relay assembly | ||
| Only one stop light does not operate | Stop light bulb (for Double Swing Out Type) | - |
| Rear combination light assembly (except Double Swing Out Type) | ||
| Rear light assembly (except Double Swing Out Type) | ||
| Harness or connector | - | |
| Only one center stop light does not operate | Center stop light assembly (for Double Swing Out Type) | |
| Center stop light assembly (except Double Swing Out Type) | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Illuminated entry does not operate (All) | Door courtesy switch circuit | |
| Illumination circuit | ||
| Main body ECU (multiplex network body ECU [for LHD]) | ||
| Main body ECU (multiplex network body ECU [for RHD]) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Door courtesy light does not turn on (All) | Perform Active Test (Door courtesy light switch) | |
| Door courtesy light switch circuit | ||
| Main body ECU (multiplex network body ECU [for LHD]) | ||
| Main body ECU (multiplex network body ECU [for RHD]) | ||
| Harness or connector | - | |
| Only front door courtesy light LH does not turn on | Front door courtesy light bulb LH | - |
| Front door courtesy light switch LH | ||
| Harness or connector | - | |
| Only front door courtesy light RH does not turn on | Front door courtesy light bulb RH | - |
| Front door courtesy light switch RH | ||
| Harness or connector | - | |
| Only rear door courtesy light LH does not turn on | Rear door courtesy light bulb LH | - |
| Rear door courtesy light switch LH | ||
| Harness or connector | - | |
| Only rear door courtesy light RH does not turn on | Rear door courtesy light bulb RH | - |
| Rear door courtesy light switch RH | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Headlight beam level control does not operate (Low beam headlights are normal) | Headlight signal circuit | |
| Headlight leveling ECU power source circuit | ||
| Headlight beam level control actuator circuit | ||
| Headlight leveling ECU assembly (for LHD) | ||
| Headlight leveling ECU assembly (for RHD) | ||
| Harness or connector | - | |
| Headlight beam level control system warning light does not come on when turning the ignition switch ON | Combination meter assembly (w/ Multi-information Display) | |
| Headlight leveling ECU assembly (for LHD) | ||
| Headlight leveling ECU assembly (for RHD) | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Headlight beam level control does not operate | Headlight leveling ECU power source circuit | |
| Headlight swivel ECU assembly (for LHD) | ||
| Headlight swivel ECU assembly (for RHD) | ||
| Headlight beam level control system warning light does not come on when turning the ignition switch ON | CAN communication system (for LHD with Central Gateway ECU) | |
| CAN communication system (for LHD without Central Gateway ECU) | ||
| CAN communication system (for RHD with Central Gateway ECU) | ||
| CAN communication system (for RHD without Central Gateway ECU) | ||
| Combination meter assembly | ||
| Headlight swivel ECU assembly (for LHD) | ||
| Headlight swivel ECU assembly (for RHD) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Daytime running light does not turn on (One side) | Headlight unit assembly (for Halogen Headlight and LED Headlight) | |
| Headlight unit assembly (for LED Headlight) | ||
| Harness or connector | - | |
| Daytime running light does not turn on (Both side) | CAN communication system (for LHD with Central Gateway ECU) | |
| CAN communication system (for LHD without Central Gateway ECU) | ||
| CAN communication system (for RHD with Central Gateway ECU) | ||
| CAN communication system (for RHD without Central Gateway ECU) | ||
| Light control switch circuit | ||
| Daytime running light relay circuit | ||
| Main body ECU (multiplex network body ECU [for LHD]) | ||
| Main body ECU (multiplex network body ECU [for RHD]) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Back-up light does not operate (All) | BK/UP LP fuse | - |
| Back-up light circuit | ||
| Park/Neutral position switch (for AE80F Automatic Transmission) | ||
| Park/Neutral position switch (for AB60F Automatic Transmission) | ||
| Park/Neutral position switch (for AC60F Automatic Transmission) | ||
| Back-up light switch (for Manual Transmission) | ||
| Harness or connector | - | |
| Only one back-up light does not operate | Back-up light bulb | - |
| Harness or connector | - | |
| Vanity light does not operate (w/ Vanity Light) | Illumination circuit | |
| Harness or connector | - | |
| Scuff plate illumination light does not operate | Front door scuff plate | |
| Front door courtesy light switch | ||
| Harness or connector | - | |
| Glove box illumination light does not operate | Glove box light | |
| Harness or connector | - | |
| Engine switch illumination does not operate (except Double Swing Out Type) | Engine switch illumination circuit | |
| Harness or connector | - | |
| Transfer position switch illumination does not operate | Transfer position switch | |
| Harness or connector | - | |
| Hazard warning signal switch illumination does not operate | Hazard warning signal switch | |
| Harness or connector | - | |
| Step light does not turn on (w/ Side Step Light) | CAN communication system (for LHD with Central Gateway ECU) | |
| CAN communication system (for LHD without Central Gateway ECU) | ||
| CAN communication system (for RHD with Central Gateway ECU) | ||
| CAN communication system (for RHD without Central Gateway ECU) | ||
| Step light bulb | - | |
| Step light assembly | ||
| No. 2 Main body ECU | ||
| Main body ECU (multiplex network body ECU [for LHD]) | ||
| Main body ECU (multiplex network body ECU [for RHD]) | ||
| Harness or connector | - | |
| Ashtray illumination does not operate | Ashtray illumination (w/ Sliding Roof) | |
| Ashtray illumination (w/o Sliding Roof) | ||
| Harness or connector | - | |
| VSC OFF switch illumination does not operate (w/ VSC) | VSC OFF switch | |
| Harness or connector | - | |
| Transmission control switch illumination does not operate | Transmission control switch (for AE80F Automatic Transmission) | |
| Transmission control switch (for AC60F Automatic Transmission) | ||
| Transmission control switch (for AB60F Automatic Transmission with Entry and Start System) | ||
| Transmission control switch (for AB60F Automatic Transmission without Entry and Start System) | ||
| Harness or connector | - | |
| Curtain shield airbag cutoff switch illumination does not operate (w/ Side Airbag) | Curtain shield airbag cutoff switch | |
| Harness or connector | - | |
| Center differential lock switch illumination does not operate | Center differential lock switch | |
| Harness or connector | - | |
| Suspension control switch illumination does not operate | Suspension control switch | |
| Harness or connector | - | |
| Air conditioning panel illumination does not operate | Air conditioning panel (w/ Multi-display) | |
| Air conditioning panel (w/o Multi-display) | ||
| Harness or connector | - | |
| Rear air conditioning panel illumination does not operate (w/ Rear Air Conditioning System) | Rear air conditioning panel | |
| Harness or connector | - | |
| Cigarette lighter illumination does not operate | Cigarette lighter assembly | |
| Harness or connector | - | |
| Steering pad switch illumination does not operate (w/ Steering Pad Switch) | Steering pad switch assembly | |
| Harness or connector | - | |
| Outer mirror switch illumination does not operate | Outer mirror switch | |
| Harness or connector | - | |
| Headlight leveling switch illumination does not operate (w/ Manual Leveling) | Headlight reveling switch | |
| Harness or connector | - | |
| Multi-display illumination does not operate (w/ Multi-display) | Multi-display assembly | |
| Seat heater switch illumination does not operate (w/ Seat Heater System) | Seat heater switch | |
| Harness or connector | - | |
| Radio receiver illumination does not operate | Radio receiver (w/o Stereo Component Amplifier) | |
| Radio receiver (w/ Multi-display) | ||
| Radio receiver (w/o Multi-display) | ||
| Harness or connector | - | |
| Door illumination does not operate | Door illumination circuit | |
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| LED indicator of the forward recognition camera does not illuminate | Forward recognition camera | |
| Harness or connector | - | |
| LED indicator remains on or blinks even if the AUTO switch of the forward recognition camera is operated | Forward recognition camera | |
| Automatic high beam indicator light does not illuminate in green (automatic high beam system operates) | Check operation condition | |
| Combination meter assembly | ||
| Main body ECU (multiplex network body ECU) [for LHD] | ||
| Main body ECU (multiplex network body ECU) [for RHD] | ||
| Automatic high beam system does not operate | Check for DTCs | |
| Check illumination condition of low and high beam headlights using manual operation | - | |
| Harness or connector | - | |
| Forward recognition camera | ||
| Main body ECU (multiplex network body ECU) [for LHD] | ||
| Main body ECU (multiplex network body ECU) [for RHD] | ||
| "Headlight system check" is displayed on the multiinformation display | Check for DTCs | |
| Main body ECU (multiplex network body ECU) [for LHD] | ||
| Main body ECU (multiplex network body ECU) [for RHD] | ||
| Forward recognition camera | ||
| Combination meter assembly |
| Symptom | Suspected Area | See page |
|---|---|---|
| Inner rear view mirror indicator light remains on when the inner rear view mirror AUTO switch is pressed. | Inner rear view mirror assembly | |
| Inner rear view mirror indicator light flashes. | Perform operation check | |
| 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 | - | |
| Combination meter assembly | ||
| Main body ECU (multiplex network body ECU [for LHD]) | ||
| Main body ECU (multiplex network body ECU [for LHD]) | ||
| Automatic high beam system does not operate (automatic high beam indicator light flashes). | Check for DTCs | |
| Combination meter assembly | ||
| 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) | ||
| Main body ECU (multiplex network body ECU [for LHD]) | ||
| Main body ECU (multiplex network body ECU [for RHD]) |
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:
-
When the front windshield is not clear (ice, snow or frost is on the glass).
-
When the front windshield is dirty (sand, mud, water stains or bugs are on the glass).
-
When there is a seal or sticker, etc., on the front windshield near the automatic high beam sensor.
*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:
-
When the inner rear view mirror assembly is at an angle due to incorrect installation or damage to the camera.
-
When the automatic aiming adjusting function of the mirror does not work correctly.
If the camera aiming is misaligned, check the following conditions:
-
Check if the vehicle is inclined.
-
Check if the windshield glass is installed correctly.
-
Check if the inner rear view mirror assembly is installed correctly.
-
Check if there is deformation of the camera or stay of the inner rear view mirror assembly.