Tesla MODEL X Owner's Manual page 16

Keys and Doors
NOTE: Unlocking Model X using this method disables
walk away locking. You must manually re-enable walk
away locking after replacing the key's battery.
Opening Interior Doors with No
Power
If Model X has no electrical power, the front doors open
as usual using the interior door handles. To open the
rear doors, carefully remove the speaker grille from the
door and pull the mechanical release cable down and
towards the front of the vehicle. After the latch is
released, manually lift up the door.
14 MODEL X Owner's Manual