Note
Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.
Tech Tips
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.
| Symptom | Suspected Area | See page |
|---|---|---|
| Automatic high beam indicator on the combination meter assembly does not illuminate | Check operating conditions | |
| Combination meter assembly | ||
| Forward recognition camera | ||
| Main body ECU (Multiplex network body ECU) (for LHD) | ||
| Main body ECU (Multiplex network body ECU) (for RHD) | ||
| Automatic high beam system does not operate | Check Data List (Auto H Beam STS) | |
| Automatic high beam switch circuit | ||
| Headlight dimmer switch circuit | ||
| Check automatic light control system operation | ||
| Forward recognition camera power source circuit | ||
| Forward recognition camera | ||
| Main body ECU (Multiplex network body ECU) (for LHD) | ||
| Main body ECU (Multiplex network body ECU) (for RHD) |
Tech Tips
Camera detection malfunctions can be detected using the GTS.
Aiming misalignment of the camera can be detected using the GTS. If the camera aiming is misaligned, check the following conditions:
Check if the vehicle is inclined.
Check if the windshield glass is installed correctly.
Check if the forward recognition camera is installed correctly.
Check if there is deformation of the forward recognition camera.
| Symptom | Suspected Area | See page |
|---|---|---|
| Inner rear view mirror indicator light flashes. | Perform operation check | |
| Inner rear view mirror assembly | ||
| Automatic high beam indicator light does not come on when the automatic high beam system is in standby mode (automatic light control system operates normally). | Perform operation check | |
| Headlight dimmer switch assembly | ||
| Harness or connector | - | |
| Combination meter assembly | ||
| Main body ECU (multiplex network body ECU) (for LHD) | ||
| Main body ECU (multiplex network body ECU) (for RHD) | ||
| Automatic high beam system does not operate (automatic high beam indicator light flashes). | Check for DTCs | |
| Combination meter assembly | ||
| Automatic high beam system does not operate (automatic high beam indicator light is on or off). | Active test | |
| Inner rear view mirror assembly (Camera detection malfunction*1) | ||
| Inner rear view mirror assembly (Aiming misalignment*2) | ||
| Main body ECU (multiplex network body ECU) (for LHD) | ||
| Main body ECU (multiplex network body ECU) (for RHD) |
Note
*1: Camera detection malfunctions can be detected using the Techstream. Under the following conditions, if the camera built into the inner rear view mirror assembly cannot detect other vehicles or lights correctly, it will stop automatic high beam control and turn off the automatic high beam indicator light:
When the front windshield is not clear (ice, snow or frost is on the glass).
When the front windshield is dirty (sand, mud, water stains or bugs are on the glass).
When there is a seal or sticker, etc., on the front windshield near the automatic high beam sensor.
*2: Aiming misalignment of the camera can be detected using the Techstream. Under the following conditions, the camera built into the rear view mirror assembly cannot adjust its center point:
When the inner rear view mirror assembly is at an angle due to incorrect installation or damage to the camera.
When the automatic aiming adjusting function of the mirror does not work correctly.
If the camera aiming is misaligned, check the following conditions:
Check if the vehicle is inclined.
Check if the windshield glass is installed correctly.
Check if the inner rear view mirror assembly is installed correctly.
Check if there is deformation of the camera or stay of the inner rear view mirror assembly.