Mazda MX-5 Owner's Manual page 255

NOTE
The Blind Spot Monitoring (BSM) will operate when all of the following conditions
are met:
The ignition is switched ON.
The Blind Spot Monitoring (BSM) switch is pressed and the Blind Spot Monitoring
(BSM) OFF indicator light in the instrument cluster is turned off.
The vehicle speed is about 30 km/h (19 mph) or faster.
The Blind Spot Monitoring (BSM) will not operate under the following circumstances.
The vehicle speed falls below about 25 km/h (15 mph) even though the Blind Spot
Monitoring (BSM) OFF indicator light is turned off.
The shift lever (manual transmission)/selector lever (automatic transmission) is
shifted to reverse (R) and the vehicle is reversing.
In the following cases, the Blind Spot Monitoring (BSM) OFF indicator light turns
on and operation of the system is stopped. If the Blind Spot Monitoring (BSM) OFF
indicator light remains illuminated, have the vehicle inspected at an Authorised Mazda
Dealer as soon as possible.
Some problem with the system including the Blind Spot Monitoring (BSM) warning
lights is detected.
A large deviation in the installation position of a radar sensor (rear) on the vehicle
has occurred.
There is a large accumulation of snow or ice on the rear bumper near a radar sensor
(rear). Remove any snow, ice or mud on the rear bumper.
Driving on snow-covered roads for long periods.
The temperature near the radar sensors (rear) becomes extremely hot due to driving
for long periods on slopes during the summer.
The battery voltage has decreased.
Under the following conditions, the radar sensors (rear) cannot detect target objects or
it may be dif cult to detect them.
A vehicle is in the detection area at the rear in an adjacent driving lane but it does
not approach. The Blind Spot Monitoring (BSM) determines the condition based on
radar detection data.
A vehicle is travelling alongside your vehicle at nearly the same speed for an
extended period of time.
Vehicles approaching in the opposite direction.
A vehicle in an adjacent driving lane is attempting to pass your vehicle.
A vehicle is in an adjacent lane on a road with extremely wide driving lanes. The
detection area of the radar sensors (rear) is set at the road width of expressways.
When Driving
i-ACTIVSENSE
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