See also:

System self-test
If an adult occupant is properly sitting on the passenger seat and the OCS classifies the occupant as an adult, the indicator lamp illuminates and goes out again after approximately 6 seconds ...

Using the rear center seat belt
If the left-hand rear seat backrest is folded down and back up again, the rear center seat belt may lock. The seat belt can then not be pulled out. To release the rear center seat belt: pull out ...

Socket in the front-compartment center console
To open: slide cover 1 forwards until it engages. Lift up the cover of socket 2. To close: press cover 1 briefly at the front. The cover moves back. ...