The invention relates to a drive of a sliding door of a motor vehicle comprising an electric drive unit (2), a drive cable (10) and a guide (3) for the drive cable (10). Said drive unit (2), the drive cable (10) and the guide (3) are fixed in the vehicle body (K) and the sliding door can be moved by means of the drive cable (10) with respect to the vehicle body. At least one sub-assembly (33) of the guide (3) of the drive cable (10) is modular and the drive cable (10) can be deflected by the modular sub-assembly (33).