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) | HEAD LL fuse or HEAD RL fuse | - |
| Discharge headlight bulb (Low) | ||
| Harness or connector | - | |
| Headlight light control ECU sub-assembly | ||
| 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 (cowl side junction block LH) | - | |
| High beam headlight does not turn on (One side) | HEAD RH fuse or HEAD LH fuse | - |
| 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 (cowl side junction block LH) | - | |
| Flash does not turn on (Low beam and high beam are normal) | Light control switch circuit | |
| Main body ECU (cowl side junction block LH) | - | |
| Discharge headlight bulb is dark | Discharge headlight bulb (Low) | |
| Harness or connector | - | |
| Headlight light control ECU sub-assembly | ||
| Headlight unit assembly |
| Symptom | Suspected Area | See page |
|---|---|---|
| Low beam headlight does not turn on (One side) | HEAD LL fuse or HEAD RL fuse | - |
| 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 (cowl side junction block LH) | - | |
| High beam headlight does not turn on (One side) | HEAD RH fuse or HEAD LH fuse | - |
| 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 (cowl side junction block LH) | - | |
| Flash does not turn on (Low beam and high beam are normal) | Light control switch circuit | |
| Main body ECU (cowl side junction block LH) | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Low beam headlight does not turn on (One side) | HEAD LL fuse or HEAD RL fuse | - |
| 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 (cowl side junction block LH) | - | |
| High beam headlight does not turn on (One side) | HEAD RH fuse or HEAD LH fuse | - |
| 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 (cowl side junction block LH) | - | |
| Flash does not turn on (Low beam and high beam are normal) | Light control switch circuit | |
| Main body ECU (cowl side junction block LH) | - |
| 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 HID Headlight) | |
| Headlight unit assembly (for Halogen 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 (cowl side junction block LH) | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Battery saving function (basic function) does not operate | Door courtesy switch circuit | |
| Harness or connector | - | |
| Main body ECU (cowl side junction block LH) | - | |
| Battery saving function (interior light auto cut function) does not operate (w/ Dome Cut Relay) | DOME CUT relay | |
| Harness or connector | - | |
| Main body ECU (cowl side junction block LH) | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Front fog light does not turn on (All) | Light control switch circuit | |
| Front fog light circuit | ||
| Harness or connector | - | |
| Main body ECU (cowl side junction block LH) | - | |
| Only one front fog light does not turn on | Front fog light bulb | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Rear fog light does not turn on (All) | Light control switch circuit | |
| Rear fog light circuit | ||
| Main body ECU (cowl side junction block LH) | - | |
| Only one rear fog light does not turn on | Rear fog light bulb | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Hazard warning signal and Turn signal light does not turn on | Turn signal flasher assembly (for LHD) | |
| Turn signal flasher assembly (for RHD) | ||
| Harness or connector | - | |
| Hazard warning signal light does not turn on | Hazard warning signal switch circuit | |
| Turn signal flasher assembly (for LHD) | ||
| Turn signal flasher assembly (for RHD) | ||
| Turn signal does not turn on | Headlight dimmer switch circuit | |
| Turn signal light circuit | ||
| Turn signal flasher assembly (for LHD) | ||
| Turn signal flasher assembly (for RHD) | ||
| Front turn signal light does not illuminate | Front turn signal light bulb | - |
| Headlight unit assembly (for HID Headlight) | ||
| Headlight unit assembly (for Halogen Headlight) | ||
| Headlight unit assembly (for LED Headlight) | ||
| Harness or connector | - | |
| Side turn signal light does not illuminate | Side turn signal light bulb (w/ Front Fender Type Side Turn Signal Light) | - |
| Side turn signal light assembly (w/o Front Fender Type Side Turn Signal Light) | ||
| Outer rear view mirror assembly (w/o Front Fender Type Side Turn Signal Light) | ||
| Harness or connector | - | |
| Rear turn signal light does not illuminate | Rear turn signal light bulb | - |
| Rear combination light assembly (for Double Swing Out Type) | ||
| Rear combination light assembly (except Double Swing Out Type) | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Stop light does not operate (All) | STOP fuse | - |
| Stop light circuit | ||
| Harness or connector | - | |
| Only one stop light does not operate | Stop light bulb (for Double Swing Out Type) | - |
| Rear combination 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 (cowl side junction block LH) | - |
| 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 (cowl side junction block LH) | - | |
| 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 | ||
| Vehicle speed signal circuit | ||
| Headlight beam level control actuator circuit | ||
| Headlight leveling ECU assembly | ||
| 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) | |
| Combination meter assembly (w/o Multi-information Display) | ||
| Headlight leveling ECU assembly | ||
| 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) | |
| CAN communication system (for RHD) | ||
| Combination meter assembly (w/ Multi-information Display) | ||
| Combination meter assembly (w/o Multi-information Display) | ||
| Headlight swivel ECU assembly (for LHD) | ||
| Headlight swivel ECU assembly (for RHD) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Daytime running light system does not operate | DRL fuse | - |
| CAN communication system (for LHD) | ||
| CAN communication system (for RHD) | ||
| Parking brake switch | ||
| Light control switch circuit | ||
| Headlight signal circuit | ||
| Headlight unit assembly (for HID Headlight) | ||
| Headlight unit assembly (for Halogen Headlight) | ||
| Headlight unit assembly (for LED Headlight) | ||
| Harness or connector | - | |
| Main body ECU (cowl side junction block LH) | - |
| 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 A750F Automatic Transmission) | ||
| Park/Neutral position switch (for AB60F 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) | |
| CAN communication system (for RHD) | ||
| Step light bulb | - | |
| Step light assembly | ||
| No. 2 Main body ECU | ||
| Main body ECU (cowl side junction block LH) | - | |
| 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 A750F Automatic Transmission) | |
| Transmission control switch (for AB60F Automatic Transmission) | ||
| 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 | - |
| 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 (cowl side junction block LH) | - | |
| 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 (cowl side junction block LH) | - |
Note
*1: Camera detection malfunctions can be detected using the intelligent tester. 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 intelligent tester. 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.