The invention relates to a method for controlling access to at least one function of a motor vehicle (10), comprising: —an action step during which an electronic control unit (11) on board the motor vehicle detects an interaction of a user with the motor vehicle, —a verification step during which the electronic control unit verifies that the user is authorized to access said function, and —an authorization step during which the electronic control unit authorises access to said function. According to the invention, said verification step comprises sending of a query message by said electronic control unit to a mobile terminal (20) carried by the user or by a person accompanying the user, and said authorisation step is only implemented if, in response to the query message, the electronic control unit receives an access-right validation message from the mobile terminal.