See also:

Channel preset
...

Type B audio set (if equipped)
The audio set will operate only when the ignition switch is in the “Acc” or “ON” position. ● Power and sound controls: refer to page 5-6 ● Radio operation: refer to page 5-9 ● ...

Safety
The Insurance Institute for Highway Safety crash-tested the 2008 Impreza, and the car earned a Good overall rating — the highest possible score — in frontal-offset, side-impact and rear crash test ...