The invention relates to a method of controlling an electrochromic mirror and to an electrochromic system which are intended for a motor vehicle. The inventive method comprises the following steps: a) detection of the incidence on the mirror of a light signal with a light intensity above a pre-determined threshold; b) upon detection of said signal, the electrchromic mirror darkens to a pre-fixed maximum level of darkness; c) when the light signal is no longer incident on the electrochromic mirror, the mirror lightens to a minimum level of darkness, thereby improving the driver's view of the exterior of the vehicle; d) the electrochromic mirror is lightened or darkened to an intermediate level; e) detection of the incidence on the mirror of a subsequent light signal with a light intensity above a pre-determined threshold; f) upon detection of said signal, the electrochromic mirror is darkened from the intermediate level to a maximum level of darkness; and g) when the subsequent light signal is no longer incident on the electrochromic mirror, the mirror returns to the intermediate level of darkness.
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