Mazda 3 Sedan 2020 Owner's Manual page 226

When Driving
Brake
CAUTION
If you stop operating the accelerator pedal before the vehicle starts moving, the
force holding the vehicle in the stopped position may weaken. Firmly depress the
brake pedal or depress the accelerator pedal to accelerate the vehicle.
NOTE
Under the following conditions, a problem with the AUTOHOLD is occurring.

Have your vehicle inspected at an Authorized Mazda Dealer as soon as possible.
A message is indicated on the multi-information display and a warning sound is

activated for about 5 seconds while the AUTOHOLD is operating or when you
press the AUTOHOLD switch.
If you switch the ignition OFF while the AUTOHOLD is operating, the parking

brake is applied automatically to assist you with parking the vehicle.
The AUTOHOLD is canceled when the selector lever/shift lever is shifted to R

position while the vehicle is on level ground, or facing up a hill or grade (as shown
below).
Vehicle posture and road surface gradient
Vehicle tilts forward
Level ground
Vehicle tilts rearward
: Reverse driving (selector lever/shift lever in the reverse (R) position)
4-72
AUTOHOLD operation status
Operates
Does not operate, canceled
Does not operate, canceled