The headlamp position control device acts with a lamp having a reflector (R) and three mounting points (A1,A2,A3) at the corners of a right-angled triangle. One point (A1) is fixed and the other two are movable but remain aligned vertically or horizontally aligned with the fixed structure. The device includes two drive elements (205,204), each having one end (204',204') attached to the mobile mounting points (A2,A3) for the lamp. A motor drive device (300) is linked to at least one of the drive elements in order to advance or withdraw the element and consequently adjust the position of the reflector.
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