Subaru Forester: Light control switch / Sensor for the auto on/off headlights

The sensor is as shown in the illustration.
CAUTION
If any object is placed on or near the
sensor, the sensor may not detect
the level of the ambient light correctly
and the auto on/off headlights
may not operate properly.
High beam
Low beam
When the headlights are on high beam, the
high beam indicator light on the
combination meter is also on...
Other information:
If the light is blinking while driving, an
engine misfire condition has been detected
which may damage the emission
control system.
To prevent serious damage to the emission
control system, you should do the
following.
Reduce vehicle speed.
Avoid hard acceleration...
WARNING
Do not use a seatbelt extender. If
a seatbelt extender is used when
installing a child restraint system,
the seatbelt will not securely
hold the child restraint system.
Use of a seatbelt extender could
cause death or serious injury to
children or other passengers in
sudden braking, swerving, or
accidents...