See also:

Weights
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Welcome lamps
When parking the vehicle, leave the switch in position or : the parking and interior lamps light up briefly when the vehicle is unlocked. Activating/deactivating the welcome lamps 1. " ...

Switching off automatically
The system switches off and the LED goes out: After approx. 160 ft/50 m when driving forward. Above approx. 22 mph/36 km/h when driving forward. Switch on the system again if necessary. ...