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 LO-beam headlight does not illuminate | H-LP L LWR fuse or H-LP R LWR fuse | - |
| Bulb | - | |
| Light control ECU | ||
| Wire harness | - | |
| Both left and right LO-beam headlights do not illuminate | MAIN fuse | - |
| HEAD LP relay | ||
| Headlight relay circuit | ||
| Light control switch circuit | ||
| Headlight signal circuit | ||
| Main body ECU RH (Cowl side junction block RH) | - | |
| One HI-beam headlight does illuminate | Bulb | - |
| Wire harness | - | |
| Front controller (Multiplex Network Body ECU) | - | |
| Both left and right HI-beam headlights do not illuminate | FR CTRL-B fuse | - |
| Headlight (HI-BEAM) circuit | ||
| Light control switch circuit | ||
| Headlight signal circuit | ||
| Front controller (Multiplex Network Body ECU) | - | |
| Main body ECU RH (Cowl side junction block RH) | - | |
| "Flash" headlight does not illuminate | Light control switch circuit | |
| Main body ECU RH (Cowl side junction block RH) | - | |
| Front controller (Multiplex Network Body ECU) | - | |
| When the headlight dimmer switch is moved to the HI-beam position, the LO-beam of the discharge headlights remains on, but the illumination area of the discharge headlights is not increased. (Bi-function does not work.) | Headlight (HI-BEAM) circuit | |
| Headlight assembly |
| Symptom | Suspected Area | See page |
|---|---|---|
| Daytime running light system does not operate | Satellite switch | |
| Light control switch circuit | ||
| Wire harness | - | |
| Daytime running light relay circuit | ||
| Front controller (Multiplex Network Body ECU) | - | |
| Main body ECU RH (Cowl side junction block RH) | - | |
| Combination meter assembly |
| Symptom | Suspected Area | See page |
|---|---|---|
| Parking light does not operate | Headlight assembly | |
| Wire harness | - | |
| Front controller (Multiplex Network Body ECU) | - | |
| One taillight does not illuminate | Rear combination light assembly | |
| Rear light assembly | ||
| Wire harness | - | |
| Taillight system does not operate (Taillights, parking lights and license plate lights do not illuminate) | TAIL fuse and FR TAIL fuse | - |
| Taillight circuit | ||
| Light control switch circuit | ||
| Front controller (Multiplex Network Body ECU) | - | |
| Main body ECU LH (Cowl side junction block LH) | - | |
| Main body ECU RH (Cowl side junction block RH) | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Stop light system does not operate | STOP SW fuse | - |
| Stop light switch | ||
| Stop light control relay | ||
| BRK-LP relay | ||
| Rear combination light assembly | ||
| Wire harness | - | |
| One side stop light does not illuminate | Rear combination light assembly | |
| Wire harness | - | |
| High mounted stop light does not illuminate | High mounted stop light assembly | |
| Wire harness | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| One fog light does not illuminate | Bulb | - |
| Wire harness | - | |
| Both left and right fog lights do not illuminate | FR FOG fuse | - |
| Front fog light circuit | ||
| Light control switch circuit | ||
| Front controller (Multiplex Network Body ECU) | - | |
| Main body ECU RH (Cowl side junction block RH) | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| One side fog light does not illuminate | Bulb | - |
| Wire harness | - | |
| Both left and right fog lights do not illuminate | RR FOG fuse | - |
| Light control switch circuit | ||
| Rear fog light circuit | ||
| Main body ECU LH (Cowl side junction block LH) | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Hazard warning light does not operate | TURN-HAZ fuse | - |
| LH-IG fuse | - | |
| Turn signal flasher assembly (for LHD) | ||
| Turn signal flasher assembly (for RHD) | ||
| Hazard warning switch | ||
| Turn signal light circuit | ||
| Wire harness | - | |
| Main body ECU RH (Cowl side junction block RH) | - | |
| One turn signal light does not operate | Bulb | - |
| Turn signal flasher assembly (for LHD) | ||
| Turn signal flasher assembly (for RHD) | ||
| Turn signal light circuit | ||
| Headlight assembly | ||
| Rear combination light assembly | ||
| Main body ECU LH (Cowl side junction block LH) | - | |
| All turn signal lights do not flash | TURN-HAZ fuse | - |
| LH-IG fuse | - | |
| Turn signal light circuit | ||
| Light control switch circuit | ||
| Hazard warning switch | ||
| Main body ECU LH (Cowl side junction block LH) | - | |
| All turn signal lights do not flash at the correct speed | Bulb | - |
| Turn signal flasher assembly (for LHD) | ||
| Turn signal flasher assembly (for RHD) | ||
| Headlight assembly | ||
| Rear combination light assembly | ||
| Wire harness | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| One back-up light does not illuminate | Bulb | - |
| Wire harness | - | |
| Both left and right back-up lights do not illuminate | LH-IG fuse | - |
| Park/Neutral position switch | ||
| Wire harness | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| One license plate light does not illuminate | License plate light assembly | |
| Wire harness | - | |
| Both left and right license plate lights do not illuminate | TAIL fuse | - |
| License plate light assembly | ||
| Wire harness | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Door mirror foot lights do not illuminate | DOME fuse | - |
| Door mirror foot light (Outer rear view mirror) | ||
| Door mirror foot light circuit | ||
| Interior light switch signal circuit | ||
| Overhead junction block (Interior light switch) | ||
| Main body ECU LH (Cowl side junction block LH) | - | |
| Main body ECU RH (Cowl side junction block RH) | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| A malfunction message is displayed in the multi-information display (Headlight beam leveling control system operates) | Multiplex communication system | |
| CAN communication system | ||
| Speed signal circuit | ||
| Indicator circuit | ||
| Generator signal circuit | ||
| Headlight leveling ECU assembly | ||
| Main body ECU LH (Cowl side junction block LH) | - | |
| Combination meter assembly | ||
| Headlight beam level control system does not operate (A malfunction message is displayed in the multi-information display) | Height control sensor circuit | |
| Headlight beam level control actuator circuit | ||
| Headlight leveling ECU assembly | ||
| Headlight beam level control system does not operate (A malfunction message is not displayed in the multi-information display) | Multiplex communication system | |
| CAN communication system | ||
| Headlight leveling ECU power source circuit | ||
| Headlight relay operation signal circuit | ||
| Generator signal circuit | ||
| Headlight leveling ECU assembly | ||
| Main body ECU LH (Cowl side junction block LH) | - |