Mazda CX-9 2016 Owner's Manual page 206

When Driving
Switches and Controls
With auto-wiper control
Switch
Position
Operation while pulling up lever
Stop
Auto control
Low speed
High speed
4–58
Wiper operation
Auto-wiper control
When the wiper lever is in the
position, the rain sensor senses the amount
of rainfall on the windshield and turns the
wipers on or off automatically (off—
intermittent—low speed—high speed).
The sensitivity of the rain sensor can be
adjusted by turning the switch on the
wiper lever.
From the center position (normal), rotate
the switch upward for higher sensitivity
(faster response) or rotate it downward for
less sensitivity (slower response).
Switch
Less sensitivity
Center
position
Higher sensitivity