See also:

Changing a fuse
Before changing a fuse: the cause of the failure must be identified and rectified, all electrical consumers must be switched off, the vehicle must be immobilised with the ignition off, ident ...

Seat backrest angle
Push the control rearwards. ...

12 V battery
The battery does not require any maintenance. However, check that the terminals are clean and correctly tightened, particularly in summer and winter. When carrying out work on the battery, refer ...