See also:

Replacing the battery in the remote key
The batteries should be replaced if: The information symbol illuminates and Low battery in remote control. Please change batteries. is shown in the display and/or if the locks do not react af ...

Low battery voltage
If the battery voltage is too low, the parking brake cannot be applied or released. Connect an auxiliary battery if the battery voltage is too low, see page 114. ...

External sound sources
USB flash drive To simplify the use of a USB flash drive, it is advisable to only store music files on the drive. It will take considerably longer for the system to index the files on the drive ...