See also:

Service booklet
Perform maintenance work at the service center, and record the work in the service booklet. The entries are proof of regular maintenance. ...

Tone
Only treble and bass can be set in the rear. The settings are made separately for the left and right headphones. Operation is the same as for the front tone. ...

Software Update
The vehicle supports various external devices depending on the current software version. With a software update, the vehicle can support new cell phones or new external device, for example. ...