Activate radio ready state:

▷ When the ignition is switched off: press ON/ OFF button on the radio.
▷ When the engine is running: press START/ STOP button.

Some electronic systems/power consumers remain ready for operation.

Radio ready state switches off automatically:

▷ After approx. 8 minutes.
▷ When the vehicle is locked using the central locking system.
▷ Shortly before the battery is discharged completely, so that the engine can still be started.