Lexus IS250 IS220d GSE20 ALE20 - LIGHTING
LIGHTING SYSTEM - PROBLEM SYMPTOMS TABLE
| Symptom | Suspected area | See page |
| One side LO-beam headlight does not illuminate | 1. H-LP L LWR fuse or H-LP R LWR fuse | - |
| 2. Bulb | - | |
| 3. Wire harness | - | |
| 4. Light control ECU | - | |
| Both left and right LO-beam headlights do not illuminate | 1. HEAD LP relay | |
| 2. Headlight relay circuit | ||
| 3. Light control switch circuit | ||
| 4. Headlight signal circuit | ||
| 5. Front controller (Engine room No. 2 R/B) | - | |
| 6. Main body ECU RH (Cowl side J/B RH) | - | |
| Without HID headlight: One side HI-beam headlight does not illuminate | 1. Bulb | - |
| 2. Wire harness | - | |
| With HID headlight: One side HI-beam headlight does not illuminate | 1. Bulb | - |
| 2. Wire harness | - | |
| 3. Front controller (Engine room No. 2 R/B) | - | |
| Both left and right HI-beam headlights do not illuminate | 1. H-LP UPR fuse | - |
| 2. Headlight (HI-BEAM) circuit | ||
| 3. Light control switch circuit | ||
| 4. Headlight signal circuit | ||
| 5. Front controller (Engine room No. 2 R/B) | - | |
| 6. Main body ECU RH (Cowl side J/B RH) | - | |
| "Flash" headlight does not illuminate | 1. Light control switch circuit | |
| 2. Main body ECU RH (Cowl side J/B RH) | - | |
| 3. Front controller (Engine room No. 2 R/B) | - | |
| When headlight dimmer switch is moved to HI-beam position, LO-beam of discharge headlights remains on, but illumination area of discharge headlight is not increased. (Bi-function does not work.) | 1. Headlight (HI-BEAM) circuit | |
| 2. Headlight assembly | ||
| 3. Front controller (Engine room No. 2 R/B) | - |
| Symptom | Suspected area | See page |
| Daytime running light system does not operate | 1. Light control switch circuit | |
| 2. Front controller (Engine room No. 2 R/B) | - | |
| 3. Main body ECU RH (Cowl side J/B RH) | - |
| Symptom | Suspected area | See page |
| Parking light does not operate | 1. Bulb | - |
| 2. Wire harness | - | |
| 3. Headlight assembly | ||
| One side taillight does not illuminate | 1. Rear combination light assembly | |
| 2. Wire harness | - | |
| Taillight system does not operate (Taillights and license plate lights do not illuminate) | 1. FR TAIL fuse | - |
| 2. Taillight circuit | ||
| 3. Light control switch circuit | ||
| 4. Front controller (Engine room No. 2 R/B) | - | |
| 5. Main body ECU LH (Cowl side J/B LH) | - |
| Symptom | Suspected area | See page |
| Stop light system does not operate | 1. STOP SW fuse | - |
| 2. Stop light switch | ||
| 3. BRK-LP relay | ||
| 4. Rear combination light | ||
| 5. Wire harness | - | |
| One side stop light does not illuminate | 1. Rear combination light | |
| 2. Wire harness | - | |
| High mounted stop light does not illuminate | 1. High mounted stop light assembly | |
| 2. Wire harness | - |
| Symptom | Suspected area | See page |
| One side fog light does not illuminate | 1. Bulb | - |
| 2. Front fog light circuit | ||
| 3. Fog light assembly | ||
| Both left and right fog lights do not illuminate | 1. FR FOG fuse | - |
| 2. FR FOG relay | - | |
| 3. Front fog light circuit | ||
| 4. Light control switch circuit | ||
| 5. Front controller (Engine room No. 2 R/B) | - | |
| 6. Main body ECU RH (Cowl side J/B RH) | - |
| Symptom | Suspected area | See page |
| One side fog light does not illuminate | 1. Bulb | - |
| 2. Wire harness | - | |
| 3. Rear combination light | ||
| Both left and right fog lights do not illuminate | 1. RR FOG fuse | - |
| 2. RR FOG relay | - | |
| 3. Light control switch circuit | ||
| 4. Rear fog light circuit | ||
| 5. Main body ECU LH (Cowl side J/B LH) | - |
| Symptom | Suspected area | See page |
| Hazard warning light does not operate | 1. TURN-HAZ fuse | - |
| 2. LH-IG fuse | - | |
| 3. Turn signal flasher | ||
| 4. Hazard warning switch | ||
| 5. Hazard warning switch circuit | ||
| 6. Turn signal light circuit | ||
| 7. Main body ECU RH (Cowl side J/B RH) | - | |
| One side turn signal light does not operate | 1. Bulb | - |
| 2. Side turn signal light | - | |
| 3. Turn signal flasher | ||
| 4. Turn signal light circuit | ||
| 5. Headlight assembly | ||
| 6. Rear combination light assembly | ||
| 7. Main body ECU LH (Cowl side J/B LH) | - | |
| All turn signal lights do not flash | 1. TURN-HAZ fuse | - |
| 2. LH-IG fuse | - | |
| 3. Turn signal light circuit | ||
| 4. Light control switch circuit | ||
| 5. Hazard warning switch | ||
| 6. Main body ECU LH (Cowl side J/B LH) | - | |
| All turn signal lights do not flash at the correct speed | 1. Bulb | - |
| 2. Turn signal flasher | ||
| 3. Side turn signal light | - | |
| 4. Headlight assembly | ||
| 5. Rear combination light assembly | ||
| 6. Wire harness | - |
| Symptom | Suspected area | See page |
| One side back-up light does not illuminate | 1. Bulb | - |
| 2. Wire harness | - | |
| Both left and right back-up lights do not illuminate | 1. LH-IG fuse | - |
| 2. Back-up light switch (for M/T) | ||
| 3. Park/Neutral position switch (for A/T) | ||
| 4. Wire harness | - |
| Symptom | Suspected area | See page |
| One side license plate light does not illuminate | 1. License plate light | |
| 2. Wire harness | - | |
| Both left and right license plate lights do not illuminate | 1. TAIL fuse | - |
| 2. License plate light | ||
| 3. Wire harness | - |
| Symptom | Suspected area | See page |
| Front personal lights do not illuminate | 1. Bulb | - |
| 2. DOME fuse | - | |
| 3. Overhead J/B (Personal light) | ||
| 4. Wire harness | - | |
| Rear personal lights do not illuminate | 1. DOME fuse | - |
| 2. Rear room light assembly (Personal light) | ||
| 3. Wire harness | - | |
| Seat illumination does not illuminate | 1. Bulb | - |
| 2. DOME fuse | - | |
| 3. Seat illumination circuit | ||
| 4. Interior light switch signal circuit | ||
| 5. Rear room light assembly | ||
| 6. Overhead J/B (Interior light switch) | ||
| 7. Main body ECU RH (Cowl side J/B RH) | - | |
| 8. Main body ECU LH (Cowl side J/B LH) | - | |
| Door courtesy lights do not illuminate | 1. DOME fuse | - |
| 2. Door courtesy light | ||
| 3. Door courtesy switch | ||
| 4. Main body ECU RH (Cowl side J/B RH) | - | |
| Scuff plate lights do not illuminate | 1. DOME fuse | - |
| 2. Scuff plate light | ||
| 3. Scuff plate light circuit | ||
| 4. Interior light switch signal circuit | ||
| 5. Overhead J/B (Interior light switch) | ||
| 6. Main body ECU LH (Cowl side J/B LH) | - | |
| 7. Main body ECU RH (Cowl side J/B RH) | - | |
| Shift illumination does not illuminate | 1. DOME fuse | - |
| 2. Shift illumination circuit | ||
| 3. Overhead J/B | ||
| 4. Main body ECU LH (Cowl side J/B LH) | - | |
| 5. Main body ECU RH (Cowl side J/B RH) | - | |
| Glove box light does not illuminate | 1. ACC fuse | - |
| 2. Glove box light | ||
| 3. Wire harness | - | |
| Footwell lights do not illuminate | 1. DOME fuse | - |
| 2. Footwell light | ||
| 3. Footwell light circuit | ||
| 4. Main body ECU RH (Cowl side J/B RH) | - | |
| Register illumination does not illuminate | 1. PANEL fuse | - |
| 2. PANEL relay (with DRL) | ||
| 3. Register illumination | ||
| 4. Wire harness | - | |
| Console box light does not illuminate | 1. ACC fuse | - |
| 2. Console box light | ||
| 3. Wire harness | - | |
| Luggage compartment room light does not illuminate | 1. Bulb | - |
| 2. DOME fuse | - | |
| 3. Luggage compartment room light | - | |
| 4. Wire harness | - |
| Symptom | Suspected area | See page |
| Vanity light does not illuminate | 1. Bulb | - |
| 2. Visor assembly | - | |
| 3. Wire harness | - | |
| Battery saving function does not operate | 1. Main body ECU LH (Cowl side J/B LH) | - |
| 2. Main body ECU RH (Cowl side J/B RH) | - | |
| Door mirror foot lights do not illuminate | 1. DOME fuse | - |
| 2. Door mirror foot light | ||
| 3. Door mirror foot light circuit | ||
| 4. Interior light switch signal circuit | ||
| 5. Overhead J/B (Interior light switch) | ||
| 6. Main body ECU LH (Cowl side J/B LH) | - | |
| 7. Main body ECU RH (Cowl side J/B RH) | - |
| Symptom | Suspected area | See page |
| AFS does not operate (*1) | 1. AFS ECU power source circuit | |
| 2. AFS ECU | - | |
| 3. Combination meter assembly | ||
| Only one swivel motor is not initialized (*1) | 1. Headlight assembly or swivel motor stuck (*2) | |
| 2. Headlight swivel motor malfunction | ||
| 3. AFS ECU | - | |
| Only swivel control does not operate or malfunctions | 1. AFS ECU switch status (*3) | |
| 2. Vehicle speed sensor malfunction | ||
| 3. BEAN communication malfunction | ||
| 4. Headlight swivel motor malfunction | ||
| 5. AFS ECU | - | |
| Swivel control and leveling control do not operate | 1. Height control sensor malfunction | |
| 2. Headlight swivel motor malfunction | ||
| 3. AFS ECU | - | |
| AFS OFF indicator light does not come on | 1. AFS OFF switch circuit | |
| 2. AFS ECU | - | |
| 3. Combination meter assembly |
- HINT:
*1: When the AFS indicator light does not come on or blink despite the symptom being occurring, check the battery voltage.
*2: Check if the headlight swivel motor turns smoothly by hand. If the motor does not turn, replace it with a new one. If the motor still does not turn, replace the headlight assembly with a new one.
*3: Before beginning diagnosis, check that the AFS setting is ON.