Mazda mx5 Owner's Manual page 263

Sensor Detection Range
The sensors detect obstructions within the following range.
Rear corner sensor detection range
Park Assist Sensor System Operation
When the ignition is switched ON and the shift lever (manual transmission)/selector lever
(automatic transmission) is shifted to the reverse (R), the beep sound activates and the
system is enabled for use.
Parking Sensor Warning Beep
The beeper sounds as follows while the system is operating.
Rear Sensor
Distance detection area
Farthest distance
Far distance
Middle distance
A
B
Distance between vehicle and obstruction
Approx. 150 cm—60 cm (59.0—23.0 in)
Approx. 60—45 cm (23—17 in)
Approx. 45—35 cm (17—13 in)
Parking Sensor System
A: About 50 cm (About 19 in)
B: About 150 cm (About 59.0 in)
Rear sensor detection range
Slow intermittent sound
Medium intermittent sound
Fast intermittent sound
When Driving
*1
Beeper sound
4–135