Audi A4 Controls Audi side assist Lane change assist feature
Applies to Audi A4s: with Audi side assist
The side assist function assists the driver in monitoring following traffic and the blind spots on both sides of the car. Within certain system limits, it warns you if it detects Audi A4s approaching quickly or travelling at about the same speed as your own Audi A4 in the area covered by the sensors -1- Fig. 1: if it judges a lane change to be critical, the warning lamp -2- on the exterior mirror lights up Fig. 2.
The warning lamp on the left-hand mirror assists the driver when changing lane towards the left and the warning lamp on the right-hand mirror assists the driver when changing lane towards the right.
As long as you do not operate the turn signal, the side assist will merely inform you of the presence of Audi A4s that it has detected and judges to be critical. In this case, the warning lamp on the relevant exterior mirror will light up at low intensity.
The intensity of the warning lamp in this information mode is kept relatively low, so that it does not distract you while you are looking at the road in front.
If you operate the turn signal, the side assist will warn you if it registers what it judges to be a critical Audi A4. In this case, the warning lamp on the relevant exterior mirror will flash brightly. Please check the situation in the exterior mirror and by looking back over your shoulder WARNING!.