Dimming Interior Lighting, Function

The dome lamp with delay/front reading lamp (N70e1), the rear dome lamp (E15/3) (not on model 208.4) and the D-pillar interior lamps (E25/3, E25/4) (model 210.2 only) or trunk lamp (E18/1) (models 202.07/08/18 only) are faded on and off by the associated control module

This means that the electrical power provided by the output stage is increased linearly over a period of 1 second when the lamp is switched on and reduced linearly for a period of 3 seconds when the lamp is switched off.