The invention relates to a man/machine interface (10) that can be used to control at least two functions of a motor vehicle, said man/machine interface comprising: a capacitive touch pad (20) including at least two control areas (21, 22, 23), each control area being configured to receive a command for at least one function; a haptic feedback device (40) configured to supply feedback to the user of the man/machine interface as acknowledgement of the command; and a control device (30) configured to receive a signal from the touch pad that is representative of a command from the user on the touch pad and to accept the command when the level of the signal received is greater than or equal to a threshold value. The invention is characterised in that the control device is configured to include different threshold values for at least two control areas of the touch pad.