Tech Tips
Use the table below to help determine the cause of a problem. The likely causes of the problem are indicated in descending order. Check each suspected area in order. Repair or replace faulty parts or perform adjustments as necessary.
| Symptom | Suspected Area | See page |
|---|---|---|
| One side LO-beam headlight does not illuminate. | H-LP LH LO fuse or H-LP RH LO fuse | - |
| Bulb | - | |
| Harness or connector | - | |
| Power distributor (Engine room junction block assembly) | - | |
| Both left and right LO-beam headlights do not illuminate. | Light control switch circuit | |
| Headlight relay circuit | ||
| Main body ECU (Instrument panel junction block) | - | |
| One side HI-beam headlight does not illuminate. | H-LP LH HI fuse or H-LP RH HI fuse | - |
| Bulb | - | |
| Harness or connector | - | |
| Power distributor (Engine room junction block assembly) | - | |
| Both left and right HI-beam headlights do not illuminate (Lo beam headlights are normal). | Light control switch circuit | |
| Headlight (HI-BEAM) circuit | ||
| Main body ECU (Instrument panel junction block) | - | |
| "High Flash" headlight does not illuminate (Passing function). | Light control switch circuit | |
| Headlight (HI-BEAM) circuit | ||
| Main body ECU (Instrument panel junction block) | - | |
| Headlight leveling can not be changed by headlight leveling switch operation. | Headlight leveling switch | |
| Harness or connector | - | |
| Headlight leveling motor |
| Symptom | Suspected Area | See page |
|---|---|---|
| One front parking light does not illuminate. | Bulb | - |
| Harness or connector | - | |
| One rear taillight does not illuminate. | Bulb | - |
| Harness or connector | - | |
| One license plate light does not illuminate. | Bulb | - |
| Harness or connector | - | |
| All of the lights do not illuminate. | TAIL fuse | - |
| Light control switch circuit | ||
| Taillight relay circuit | ||
| Main body ECU (Instrument panel junction block) | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| One stop light does not illuminate. | Bulb | - |
| Harness or connector | - | |
| High-mounted stop light does not illuminate. | High-mounted stop light assembly | |
| Harness or connector | - | |
| All of the lights do not operate. | STOP fuse | - |
| Stop light switch | ||
| BRK Relay | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| One fog light does not illuminate. | Bulb | - |
| Harness or connector | - | |
| Both left and right fog lights do not illuminate (Taillights illuminate). | FR FOG fuse | - |
| Light control switch circuit | ||
| Front fog light circuit | ||
| Main body ECU (Instrument panel junction block) | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Rear fog light does not illuminate (Taillights illuminate). | Bulb | - |
| RR FOG fuse | - | |
| Light control switch circuit | ||
| Rear fog light circuit | ||
| Main body ECU (Instrument panel junction block) | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Hazard warning lights do not operate (Turn signal lights are normal). | HAZ fuse | - |
| Hazard warning switch | ||
| Turn signal flasher assembly | ||
| Harness or connector | - | |
| Turn signal lights do not operate (Hazard warning lights are normal). | GAUGE No. 1 fuse | - |
| Headlight dimmer switch assembly (Turn signal switch) | ||
| Turn signal flasher assembly | ||
| Harness or connector | - | |
| Hazard warning lights and turn signal lights do not operate. | Turn signal flasher assembly | |
| Harness or connector | - | |
| Turn signal lights do not operate in one direction. | Headlight dimmer switch assembly (Turn signal switch) | |
| Turn signal flasher assembly | ||
| Harness or connector | - | |
| Only one bulb does not operate. | Bulb | - |
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| One side back-up light does not illuminate. | Bulb | - |
| Harness or connector | - | |
| Both left and right back-up lights do not illuminate. | GAUGE No. 1 fuse | - |
| Park/Neutral position switch (for U151E) | ||
| Park/Neutral position switch (for U151F) | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Only personal light does not illuminate. | Bulb | - |
| Personal light assembly | ||
| Harness or connector | - | |
| Only front interior light does not illuminate. | Bulb | - |
| Harness or connector | - | |
| Only rear interior light does not illuminate. | Bulb | - |
| Harness or connector | - | |
| Only ignition key cylinder light does not illuminate. (w/o Smart Entry and Start System) | Ignition key cylinder light | |
| Harness or connector | - | |
| Only engine switch illumination does not illuminate. (w/ Smart Entry and Start System) | Engine switch illumination circuit | |
| Main body ECU (Instrument panel junction block) | - | |
| One side door mirror foot light does not come on. | Bulb | - |
| Door mirror foot light | ||
| Harness or connector | - | |
| Both left and right door mirror foot lights do not come on (Interior lights operate normally). | Door mirror foot light circuit | |
| Door control switch | ||
| Door key linked lock switch (Driver side door lock assembly) | ||
| Harness or connector | - | |
| Main body ECU (Instrument panel junction block) | - | |
| Illuminated entry system does not operate normally. | DOME fuse | - |
| Door courtesy switch circuit | ||
| Door lock position switch circuit | ||
| IG signal circuit | ||
| ACC signal circuit | ||
| Door control switch | ||
| Door key linked lock switch (Driver side door lock assembly) | ||
| Interior light circuit | ||
| Engine switch illumination circuit | ||
| Door mirror foot light circuit | ||
| Harness or connector | - | |
| Main body ECU (Instrument panel junction block) | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Vanity light does not illuminate. | Bulb | - |
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Glove box light does not illuminate. | Glove box light assembly | |
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Front personal lights do not illuminate. | Bulb | - |
| Personal light assembly | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Front door courtesy light does not illuminate. | Front door courtesy light | |
| Front door courtesy switch | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Automatic light control system does not operate normally. | Check DTCs | |
| Light control switch circuit | ||
| IG signal circuit | ||
| Main body ECU (Instrument panel junction block) | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Light auto turn off system does not operate normally. | Light control switch circuit | |
| Door courtesy switch circuit | ||
| IG signal circuit | ||
| Main body ECU (Instrument panel junction block) | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Battery saving function does not operate. | Door courtesy switch circuit | |
| Unlock warning switch circuit | ||
| IG signal circuit | ||
| Main body ECU (Instrument panel junction block) | - |