Problem Symptoms Table [12/2018 - ]
WARNING: This page is about a different car, the 2022 Toyota Prius, 2021 Toyota Prius, 2020 Toyota Prius, and 2019 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
If the No. 1 headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the No. 1 headlight ECU sub-assembly LH.
Refer to INITIALIZATION [12/2018 - 06/2021] , or refer to INITIALIZATION [06/2021 - ]
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.
AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM
| Symptom | Suspected Area | Link |
|---|---|---|
| Automatic headlight beam level control system does not operate (Left Headlight) | Headlight unit assembly LH | Refer to DISASSEMBLY [12/2018 - ] |
| No. 1 headlight ECU sub-assembly LH | Refer to REMOVAL [12/2018 - ] | |
| Automatic headlight beam level control system does not operate (Right Headlight) | Headlight unit assembly RH | Refer to DISASSEMBLY [12/2018 - ] |
| No. 1 headlight ECU sub-assembly RH | Refer to REMOVAL [12/2018 - ] | |
| Initialization cannot be performed | CAN communication system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2018 - ] |
| No. 1 headlight ECU sub-assembly LH | Refer to REMOVAL [12/2018 - ] |