Problem Symptoms Table [10/2016 - 09/2020]
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2020 Lexus IS 350, 2020 Lexus IS 300, 2019 Lexus IS 350, 2019 Lexus IS 300, and 2018 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
If the headlight swivel ECU assembly has been replaced, it is necessary to synchronize the vehicle information and initialize the headlight swivel ECU assembly.
Refer to INITIALIZATION [10/2016 - 09/2020]
HINT:
- 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.
- Inspect the fuses and relays related to this system before inspecting the suspected areas below.
AFS (ADAPTIVE FRONT-LIGHTING SYSTEM)
| Symptom | Suspected Area | Link |
|---|---|---|
| AFS (adaptive front-lighting system) does not operate | Check DTCs | Refer to DTC CHECK / CLEAR [10/2016 - 09/2020] |
| Check the fail-safe function | Refer to FAIL-SAFE CHART [10/2016 - 09/2020] | |
| ECU power source circuit | Refer to ECU Power Source Circuit [10/2016 - 09/2020] | |
| Headlight swivel ECU assembly | Refer to REMOVAL [10/2016 - 09/2020] | |
| AFS (adaptive front-lighting system) cannot be cancelled using AFS On/Off switch | CAN communication system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2016 - 09/2018] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2018 - ] |
| Headlight swivel ECU assembly | Refer to REMOVAL [10/2016 - 09/2020] | |
| Combination meter assembly | Refer to REMOVAL [10/2016 - 09/2020] | |
| Initialization cannot be performed | Check DTCs | Refer to DTC CHECK / CLEAR [10/2016 - 09/2020] |
| CAN communication system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2016 - 09/2018] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2018 - ] | |
| Headlight swivel ECU assembly | Refer to REMOVAL [10/2016 - 09/2020] | |
| AFS OFF indicator light does not come on when turning the engine switch on (IG) | Headlight swivel ECU assembly | Refer to REMOVAL [10/2016 - 09/2020] |
| Combination meter assembly | Refer to REMOVAL [10/2016 - 09/2020] |