Tech Tips
If any of the following symptoms exist despite the normal system code being output when checking for CAN communication and LKA/LDA system DTCs, check the suspected areas in the order they are listed.
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.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.
| Symptom | Suspected Area | Link |
|---|---|---|
| LKA/LDA system does not operate | Power source circuit | |
| Steering pad switch circuit | ||
| CAN communication system | ||
| Forward recognition camera | ||
| The LKA/LDA indicator does not illuminate even when the LKA/LDA main switch (steering pad switch assembly) is operated. | Indicator circuit | |
| Steering pad switch circuit | ||
| CAN communication system | ||
| Combination meter assembly | ||
| Forward recognition camera | ||
| Driving support ECU assembly | Click here | |
| The LKA/LDA indicator does not turn off even when the LKA/LDA main switch (steering pad switch assembly) is operated. | Indicator circuit | |
| Steering pad switch circuit | ||
| CAN communication system | ||
| Combination meter assembly | ||
| Forward recognition camera | ||
| LKA/LDA system is not canceled even when turn signal light switch is operated | Data List/Active Test (Check turn signal switch signal) |
|
| Turn signal switch circuit | ||
| Forward recognition camera | ||
| Increase in cases that driver can see line markers but system cannot detect lane markers | Windshield glass is dirty | - |
| Forward recognition camera is dirty | - | |
| Headlight assemblies are dirty or worn | - | |
| Non-standard suspension is installed | - | |
| Non-standard tires are installed | - | |
| Non-Lexus genuine windshield glass is installed | - | |
| There is a foreign object or foreign matter between the windshield glass and forward recognition camera | - | |
| A sticker or similar item is attached to the area in front of the forward recognition camera | - | |
| Adjust forward recognition camera | ||
| Forward recognition camera | ||
| LKA/LDA system is operating, but no operation condition is displayed on multi-information display in combination meter assembly | Data List/Active Test (Check the item LDA Control) |
|
| Combination meter assembly | ||
| Forward recognition camera | ||
| Buzzer does not sound even when vehicle deviates from its lane. | Combination meter assembly | |
| Forward recognition camera |