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 |
|---|---|---|
| Inner rear view mirror assembly indicator light does not come on when ignition switch is turned from off to ON | Power source circuit | |
| Inner rear view mirror assembly | ||
| Inner rear view mirror assembly indicator light remains on or flashes when inner rear view mirror assembly AUTO switch is pressed | Inner rear view mirror assembly | |
| Automatic high beam indicator light on the combination meter assembly does not illuminate | Check operating conditions | |
| Combination meter assembly | ||
| Inner rear view mirror assembly | ||
| Main body ECU (multiplex network body ECU) | ||
| Automatic high beam system does not operate | Check Data List (Auto H Beam STS) | |
| High beam headlight circuit | ||
| Headlight dimmer switch circuit | ||
| Power source circuit | ||
| Inner rear view mirror assembly | ||
| Main body ECU (multiplex network body ECU) |
Tech Tips
Camera detection malfunctions can be detected using the intelligent tester. 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 on the glass).
When the front windshield is dirty (sand, mud, water stains or bugs are on the glass).
Aiming misalignment of the camera can be detected using the intelligent tester. If the camera aiming is misaligned, check the following:
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 the camera or stay of the inner rear view mirror assembly is deformed.