Assembly of an optical module support and a connecting device able to receive a means for adjusting the support position

The assembly (10) has a connecting device (12) connected between a support (11) of an optical module (7) and an adjusting unit (13). The adjusting unit adjusts the position of the support of the optical module. The connecting device comprises a portion (21) that allows displacement of the adjusting unit along a sliding axis (C), where the sliding axis is oriented at an angle of inclination (alpha) between 5 and 45 degree with respect to a vertical axis (V). The optical module projects a light beam along an optical axis (A). The sliding axis is located in a longitudinal plane. An independent claim is also included for a lighting and/or signaling device of a vehicle.