Subaru BRZ 2017 Owner's Manual page 216

2-3. Operating the lights and windshield wipers
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Daytime running light system (if equipped)
Vehicles with an automatic transmission: To make your vehicle more visible
to other drivers during daytime driving, the daytime running lights turn on
automatically whenever the engine is started and the parking brake is
released with the headlight switch off or in the "AUTO" position. (Illuminate
brighter than the front position lights.) Daytime running lights are not
designed for use at night.
Vehicles with a manual transmission: To make your vehicle more visible to
other drivers during daytime driving, the daytime running lights turn on auto-
matically whenever the engine is started and the parking brake is released
with the headlight switch off or in the "AUTO" position. (Illuminate brighter
than the front position lights.) Daytime running lights are not designed for
use at night.
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Headlight control sensor
216
Headlight control sensor is located on the
passenger's side.
The sensor may not function properly if
an object is placed on the sensor, or any-
thing that blocks the sensor is affixed to
the windshield.
Doing so interferes with the sensor
detecting the level of ambient light and
may cause the automatic headlight sys-
tem to malfunction.