Acura MDX 2020 Owner's Manual page 150

uuLocking and Unlocking the DoorsuLocking/Unlocking the Doors from the Outside
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Locking/Unlocking the Doors Using a Key
If the lock or unlock button of the keyless access remote does not work, use the key
instead.
2 Replacing the Button Battery P. 613
Lock
148
Fully insert the key and turn it.
Unlock
1Locking/Unlocking the Doors Using a Key
When you lock the driver's door with a key, all the
other doors and tailgate lock at the same time. When
unlocking, the driver's door unlocks first. Turn the
key a second time within a few seconds to unlock the
remaining doors and the tailgate.
You can customize the door unlock mode setting.
2 Customized Features P. 126, 358