Mazda 3 Sedan 2019 Owner's Manual page 157

Symptom
Android Auto™ is activated each
time an Android™-genuine connec-
tor cord connected to your An-
droid™ Smartphone is inserted into
the USB port. (You have an An-
droid™ Smartphone which you do
not want to use to activate Android
Auto™ mode)
Cause
Set the "Device Connection Status"
of the connected Android™ Smart-
phone to "Always Enable".
Troubleshooting
Troubleshooting
Solution method
Set the "Device Connection Status"
to "Never Enabled".
Refer to Connectivity Settings on
page 7-17.
10-5