Mazda 2015 5 Owner's Manual page 206

Interior Comfort
Climate Control System
Rear vent buttons
The rear vent switches adjust the airflow
volume flowing from the rear vent.
OFF: Fan off
LO: Low speed
HI: High speed
NOTE
Only cool or cold air (no heat) blows through
the rear vents while the front climate control is
on. Heat for the rear passengers comes from
under the front seats when the front heater is
on and set to floor mode.
When pressing the rear ventilation control
switch on the front control panel (with climate
control system on), the rear ventilation system
operates at low speed only. To change to high
speed, press the HI rear vent button.
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