The official notice
Defect
On certain vehicles, the vehicle may make a reverse warning sound when the gear selector is in a position other than reverse. As a result, the vehicles don't meet the requirements of the Canadian regulations.
Safety Risk
Audible warnings that don't work correctly could create confusion and increase the risk of injury for pedestrians and cyclists.
Remedy
Mazda will notify owners by mail and advise you to take your vehicle to a dealership to reprogram the software for the Approaching Vehicle Audible System (AVAS) Information Sound Box (ISB) amplifier. To minimize the safety risk, Mazda recommends that you should move the shift lever slowly when shifting from 'P' to 'N' or from 'P' to 'D' and pause for at least one second at the 'R' position until the recall repairs are completed.