See also:

To enter the passive mode
If you wish to program the passive arming mode, have it done by your SUBARU dealer. ...

Precautions against vehicle modification
Always consult your SUBARU dealer if you want to install any accessory parts to your vehicle. Do not perform any of the following modifications. Such modifications can interfere with proper opera ...

When CD is in the player (type A)/ When playing back all CDs in the player (type B)
When the “CD/AUX” button is pressed, the player will start playback. ...