Problem Symptoms Table
HINT:
- Use the table below to help determine the cause of the problem symptom. 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.
- Inspect the fuses and relays related to this system before inspecting the suspected areas below.
LANE-KEEPING ASSIST SYSTEM
| Symptom | Suspected Area | See |
|---|---|---|
| Lane-keeping assist system does not operate | Main switch circuit | Refer to Main Switch Circuit |
| Lane-recognition camera sensor assembly | Refer to REMOVAL | |
| Harness and connector | - | |
| Driving support ECU | Refer to REMOVAL | |
| LKA indicator light is abnormal (Does not turn on) | Indicator light circuit | Refer to Indicator Circuit |
| Main switch circuit | Refer to Main Switch Circuit | |
| Combination meter | Refer to PROBLEM SYMPTOMS TABLE | |
| Driving support ECU | Refer to REMOVAL | |
| LKA indicator light is abnormal (Remains on) | Indicator light circuit | Refer to Indicator Circuit |
| Main switch circuit | Refer to Main Switch Circuit | |
| Combination meter | Refer to PROBLEM SYMPTOMS TABLE | |
| Driving support ECU | Refer to REMOVAL | |
| Lane-keeping assist system is not canceled even when turn signal light switch is operated | Turn signal light switch | Refer to INSPECTION |
| Harness or connector | - | |
| Driving support ECU | Refer to REMOVAL | |
| Lane-keeping assist system is not canceled even when windshield wiper switch is operated (Lo or Hi) | Windshield wiper switch | Refer to HOW TO PROCEED WITH TROUBLESHOOTING |
| Harness or connector | - | |
| Driving support ECU | Refer to REMOVAL | |
| Increase in cases that driver can see line marker but system cannot detect lane markers | Windshield glass is dirty | - |
| Lane recognition camera sensor is dirty | - | |
| Adjust object recognition camera sensor | Refer to ADJUSTMENT | |
| Driving support ECU | Refer to REMOVAL | |
| Lane-keeping assist system is operating, but no operation condition is displayed on multi-information display in combination meter | Combination meter | Refer to PROBLEM SYMPTOMS TABLE |
| Driving support ECU | Refer to REMOVAL | |
| Buzzer does not sound even when lane markers are lost during lane departure warning function | Skid control buzzer | Refer to DTC C1A4A: Skid Control Buzzer Circuit |
| Brake booster with master cylinder (skid control ECU) | Refer to REMOVAL | |
| Driving support ECU | Refer to REMOVAL | |
| Lane-keeping assist system cannot detect line marker during nighttime | Headlight | Refer to HOW TO PROCEED WITH TROUBLESHOOTING |
| Driving support ECU | Refer to REMOVAL |