Subaru BRZ 2018 Owner's Manual page 198

2-1. Driving procedures
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Turn signals can be operated when
Vehicles without a keyless access with push button start system
The engine switch is in the "ON" position.
Vehicles with a keyless access with push button start system
The push-button ignition switch is in "ON" mode.
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If the indicators flash faster than usual
Check that a light bulb in the turn signal lights has not burned out.
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If the turn signals stop flashing before a lane change has been per-
formed
Operate the lever again.
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To discontinue flashing of the turn signals during a lane change
Operate the lever in the opposite direction.
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Customization that can be configured at your SUBARU dealer
The lane change turn signal function can be disabled.
(Customizable features:
196
P. 522)