A capacitive detection device for detecting the presence of a person near or in contact with a component of a motor vehicle, which component is provided with a capacitive sensor, said device comprising - at least one electrode of the capacitive sensor, - a voltage source arranged to deliver an alternating voltage, - a device for measuring a complex value, corresponding to an impedance or an admittance, between said electrode and an electrical circuit reference point; - a first calibration resistor (R c1, R c2) for calibrating the measurement of a complex impedance or admittance value; wherein: said capacitive detection device comprises a switching device (26, SW1-SW6) arranged to - connect the voltage source to said electrode, in a measurement mode, - connect the voltage source to the first calibration resistor (R c1, R c2) and disconnect said electrode from the voltage source, in a calibration mode, and the measuring device is arranged to - measure a first complex value of the first calibration resistor (R C1, R C2), during operation in the calibration mode; - measure a second complex value between said electrode and said electrical circuit reference point, during operation in the measurement mode, and - correct the second measured complex value on the basis of the first measured complex value, characterized in that the capacitive detection device further comprises a second calibration resistor (R C1, R C2), in that the first and the second calibration resistor (R C1, R C2) have different resistive values, and in that the two calibration resistors (R C1, R C2) are mounted in parallel and the switching device (26, SW1-SW6) is arranged to selectively connect the voltage source to one or the other of the two resistors (R C1, R C2). - at least one electrode of the capacitive sensor, - a voltage source arranged to deliver an alternating voltage, - a device for measuring a complex value, corresponding to an impedance or an admittance, between said electrode and an electrical circuit reference point; - a first calibration resistor (R c1, R c2) for calibrating the measurement of a complex impedance or admittance value; said capacitive detection device comprises a switching device (26, SW1-SW6) arranged to - connect the voltage source to said electrode, in a measurement mode, - connect the voltage source to the first calibration resistor (R c1, R c2) and disconnect said electrode from the voltage source, in a calibration mode, and the measuring device is arranged to - measure a first complex value of the first calibration resistor (R C1, R C2), during operation in the calibration mode; - measure a second complex value between said electrode and said electrical circuit reference point, during operation in the measurement mode, and - correct the second measured complex value on the basis of the first measured complex value, - connect the voltage source to said electrode, in a measurement mode, - connect the voltage source to the first calibration resistor (R c1, R c2) and disconnect said electrode from the voltage source, in a calibration mode, and the measuring device is arranged to - measure a first complex value of the first calibration resistor (R C1, R C2), during operation in the calibration mode; - measure a second complex value between said electrode and said electrical circuit reference point, during operation in the measurement mode, and - correct the second measured complex value on the basis of the first measured complex value, characterized in that the capacitive detection device further comprises a second calibration resistor (R C1, R C2), in that the first and the second calibration resistor (R C1, R C2) have different resistive values, and in that the two calibration resistors (R C1, R C2) are mounted in parallel and the switching device (26, SW1-SW6) is arranged to selectively connect the voltage source to one or the other of the two resistors (R C1, R C2).