Control module for a human-machine dialogue system, said system including a plurality of human-machine dialogue members , each human-machine dialogue member comprising a functional element that includes at least one electrical contact (S1) and/or a signalling indicator (DI1); - said control module comprising a microcontroller that is designed to be connected to a first power supply source, a common line (LC) that is designed to link the microcontroller to all of the functional elements and a plurality of control lines (LCD1, LCD2), each designed to link the microcontroller to a functional element of a distinct human-machine dialogue member; - said control module being configured to operate in a write mode to attribute a state to each signalling indicator of each human-machine dialogue member and in a read mode to read a state of the electrical contact of each human-machine dialogue member; - said write mode being applied by placing said common line (LC) at a first electrical potential and said read mode being applied by placing said common line (LC) at a second electrical potential, distinct from the first electrical potential, - said microcontroller being configured to read the state of the electrical contact (S1) of each human-machine dialogue member on the associated control line in said read mode, characterized in that the control module includes: - for each control line of a human-machine dialogue member, at least one power supply block that is designed to be linked to a second power supply source and connected to said control line of said human-machine dialogue member; - said microcontroller being configured to activate or to deactivate each power supply block in said write mode by changing the electrical potential assigned to the associated control line. - said control module comprising a microcontroller that is designed to be connected to a first power supply source, a common line (LC) that is designed to link the microcontroller to all of the functional elements and a plurality of control lines (LCD1, LCD2), each designed to link the microcontroller to a functional element of a distinct human-machine dialogue member; - said control module being configured to operate in a write mode to attribute a state to each signalling indicator of each human-machine dialogue member and in a read mode to read a state of the electrical contact of each human-machine dialogue member; - said write mode being applied by placing said common line (LC) at a first electrical potential and said read mode being applied by placing said common line (LC) at a second electrical potential, distinct from the first electrical potential, - said microcontroller being configured to read the state of the electrical contact (S1) of each human-machine dialogue member on the associated control line in said read mode, - for each control line of a human-machine dialogue member, at least one power supply block that is designed to be linked to a second power supply source and connected to said control line of said human-machine dialogue member; - said microcontroller being configured to activate or to deactivate each power supply block in said write mode by changing the electrical potential assigned to the associated control line. <EOS>