A motor vehicle comprising side doors, a bonnet and a boot lid, power-operated key-cylinder-less locks associated with all the side doors, a power-operated lock associated with the boot lid, a key-cylinder lock associated with the bonnet, and an electronic control system configured to sense operation of the key-cylinder lock by means of a mechanical key and, upon determining a specific operation of the key-cylinder lock by means of a mechanical key, responsively unlock one or more of the power-operated key-cylinder-less locks.