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 |
|---|---|---|
| One of the low beam and high beam headlights does not illuminate. | H-LP LH-LO fuse or H-LP RH-LO fuse | - |
| Discharge headlight bulb | ||
| Harness or connector | - | |
| Headlight light control ECU sub-assembly | ||
| Headlight unit assembly | ||
| No low beam or high beam headlights illuminate. | Headlight dimmer switch circuit | |
| Headlight relay circuit | ||
| Harness or connector | - | |
| Main body ECU (Multiplex network body ECU) | ||
| High beam flash function does not operate. | Headlight dimmer switch circuit | |
| Main body ECU (Multiplex network body ECU) | ||
| Discharge headlight bulb is dark. | Discharge headlight bulb | |
| Harness or connector | - | |
| Headlight light control ECU sub-assembly | ||
| One of the headlights does not switch to high beam mode. | Harness or connector | - |
| No. 2 integration relay | ||
| Headlight unit assembly | ||
| No headlights switch to high beam mode. | Headlight dimmer switch circuit | |
| Headlight (High beam) circuit | ||
| Harness or connector | - | |
| No. 2 integration relay | ||
| Main body ECU (Multiplex network body ECU) | ||
| Clearance lights do not illuminate. | Harness or connector | - |
| Headlight unit (clearance light) | ||
| Headlight unit assembly |
| Symptom | Suspected Area | See page |
|---|---|---|
| Low beam headlight on one side does not illuminate. | H-LP LH-LO fuse or H-LP RH-LO fuse | - |
| Harness or connector | - | |
| Light control ECU (for low beam) | ||
| Headlight LED unit assembly | ||
| Headlight assembly | ||
| Both left and right low beam headlights do not illuminate. | Headlight dimmer switch circuit | |
| Headlight relay circuit | ||
| Harness or connector | - | |
| Main body ECU (Multiplex network body ECU) | ||
| High beam flash function does not operate. | Headlight dimmer switch circuit | |
| Main body ECU (Multiplex network body ECU) | ||
| High beam headlight on one side does not illuminate. | Harness or connector | - |
| No. 2 integration relay | ||
| Light control ECU (for high beam) | ||
| Headlight LED unit assembly | ||
| Headlight assembly | ||
| Both left and right high beam headlights do not illuminate. | Headlight dimmer switch circuit | |
| Headlight (High beam) circuit | ||
| Harness or connector | - | |
| No. 2 integration relay | ||
| Main body ECU (Multiplex network body ECU) | ||
| Clearance lights and side marker light do not illuminate. | Harness or connector | - |
| Headlight unit (clearance light) | ||
| Headlight assembly |
| Symptom | Suspected Area | See page |
|---|---|---|
| Front fog light does not illuminate (taillight is normal). | Front fog light bulb | |
| Headlight dimmer switch circuit | ||
| Front fog light circuit | ||
| Harness or connector | - | |
| No. 2 integration relay | ||
| Main body ECU (Multiplex network body ECU) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Rear fog light does not illuminate (taillight is normal). | RR FOG fuse | - |
| Headlight dimmer switch circuit | ||
| Rear fog light circuit | ||
| Harness or connector | - | |
| Rear light lens and body LH (for LHD) | ||
| Rear light lens and body RH (for RHD) | ||
| Rear light socket and wire | ||
| Main body ECU (Multiplex network body ECU) |
| Symptom | Suspected Area | See page |
|---|---|---|
| License plate light does not illuminate. | License plate light assembly | |
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Taillight does not illuminate (rear combination light). | Rear combination light lens and body | |
| Rear combination light socket and wire sub-assembly | ||
| Harness or connector | - | |
| Taillight does not illuminate (rear light). | Rear light lens and body | |
| Rear light socket and wire | ||
| Harness or connector | - | |
| All lights do not illuminate. | Headlight dimmer switch circuit | |
| Taillight relay circuit | ||
| Harness or connector | - | |
| No. 2 integration relay | ||
| Main body ECU (Multiplex network body ECU) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Stop light on one side 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 | |
| Harness or connector | - | |
| All lights do not operate. (w/ Emergency Stop Light) | STOP fuse | - |
| Stop light circuit | ||
| Harness or connector | - | |
| No. 2 integration relay | ||
| All lights do not operate. (w/o Emergency Stop Light) | STOP fuse | - |
| Stop light switch assembly | ||
| Harness or connector | - | |
| No. 2 integration relay |
| Symptom | Suspected Area | See page |
|---|---|---|
| Back-up light on one side does not illuminate. | Back-up light bulb | |
| Rear light socket and wire | ||
| Harness or connector | - | |
| Both left and right back-up lights do not illuminate. | Hybrid control system | |
| BACK UP fuse | - | |
| IGCT NO. 1 fuse | - | |
| IGCT NO. 5 fuse | - | |
| IGCT relay | - | |
| No. 1 junction block assembly (BACK UP LP relay) | - | |
| Shift lever position sensor | ||
| Power management control ECU | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Headlight dimmer switch assembly (turn signal light switch) does not function properly. | Windshield wiper switch assembly | |
| Headlight dimmer switch assembly | ||
| Spiral with sensor cable sub-assembly (steering angle sensor) | ||
| Harness or connector | - | |
| No turn signal lights operate. | Turn signal switch circuit | |
| Windshield wiper switch assembly | ||
| Combination meter assembly | ||
| One of the turn signal lights does not operate. | Meter/gauge system |
| Symptom | Suspected Area | See page |
|---|---|---|
| Hazard warning lights do not operate (turn signal lights are normal). | HAZ fuse | - |
| Hazard warning switch circuit | ||
| Combination meter assembly | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Automatic light control system does not operate. | Headlight dimmer switch circuit | |
| IG signal 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 | |
| Door courtesy switch circuit | ||
| IG signal circuit | ||
| Main body ECU (Multiplex network body ECU) |
| Symptom | Suspected Area | See page |
|---|---|---|
| AFS does not operate. | Headlight swivel ECU assembly power source | |
| Headlight swivel ECU assembly (for LHD) | ||
| Headlight swivel ECU assembly (for RHD) | ||
| AFS OFF indicator light does not come on when turning the power switch on (IG). | CAN communication system (for LHD) | |
| CAN communication system (for RHD) | ||
| Combination meter assembly | ||
| Headlight swivel ECU assembly (for LHD) | ||
| Headlight swivel ECU assembly (for RHD) | ||
| AFS on/off condition cannot be changed using headlight swivel main switch. | CAN communication system (for LHD) | |
| CAN communication system (for RHD) | ||
| Headlight swivel main switch | ||
| Harness or connector | - | |
| Combination meter assembly | ||
| Headlight swivel ECU assembly (for LHD) | ||
| Headlight swivel ECU assembly (for RHD) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Automatic headlight beam level control system does not operate. | Headlight swivel ECU assembly power source | |
| Headlight swivel ECU assembly (for LHD) | ||
| Headlight swivel ECU assembly (for RHD) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Daytime running light system does not operate. | CAN communication system (for LHD) | |
| CAN communication system (for RHD) | ||
| Headlight dimmer switch circuit | ||
| DRL relay circuit | ||
| Harness or connector | - | |
| No. 2 integration relay | ||
| Headlight unit (clearance light) (for HID Headlight) | ||
| Headlight unit (clearance light) (for LED Headlight) | ||
| Headlight unit assembly (for HID Headlight) | ||
| Headlight assembly (for LED Headlight) | ||
| Main body ECU (Multiplex network body ECU) |
| Symptom | Suspected Area | See page |
|---|---|---|
| Inner rear view mirror indicator light remains on when the inner rear view mirror assembly AUTO switch is pressed. | Inner rear view mirror assembly (automatic high beam sensor) | |
| Inner rear view mirror indicator light flashes. | Perform operation check | |
| Inner rear view mirror assembly (automatic high beam sensor) | ||
| 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 | ||
| Integration control and panel assembly (automatic high beam main switch) | ||
| Harness or connector | - | |
| Combination meter assembly | ||
| Main body ECU (Multiplex network body ECU) | ||
| 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 (Automatic High Beam Operation) | |
| Date List (Auto H Beam STS) | ||
| Main body ECU (Multiplex network body ECU) |