Subaru 2015 XV Crosstrek Hybrid Owner's Manual page 214

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Instruments and controls/Multi function display
2. Operate the or
select the Hazard Warning Flasher item.
Then push the button.
3. The current setting will be displayed.
Push the button to enter the selection
mode.
switch to 4. Select On or Off by operating the
or switch. Then push the
button.
5. Select Set by operating the
switch, and confirm the setting by pushing
the button.
6. The system will notify you that the
setting is complete.
If the setting is not available, the following
notification will be displayed. In this case,
perform the setting procedure again.