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:
Battery: Button battery CR1620 or
equivalent
Wrap a flat-head screwdriver with vinyl
tape or a cloth. Open the key head using a
flat-head screwdriver.
Remove the transmitter case from the
key head.
Open the transmitter case by releasing
the hooks...
CAUTION
Do not let dust, oil or water get on
or in the access key fob/transmitter
when replacing the battery.
Before replacing the battery, remove
any static electricity.
Be careful not to touch or damage
the printed circuit board in the
access key fob/transmitter when
replacing the battery...