dito......
http://vault.alpine-usa.com/products...20CVA-1004.pdf
To activate the DVD mode:
To watch a video source, your vehicle must be
parked with the ignition key in the ACC or ON
position. To do this, follow the procedure below.
1. Push the foot brake to bring your vehicle to a
complete stop at a safe location. Engage the
parking brake.
2. Keep pushing the foot brake and release the
parking brake once then engage it again.
3. While the parking brake is being engaged the
second time, release the foot brake.
Now, the locking system for the DVD mode
operation has been released. Unless the ignition key
is turned OFF, the DVD mode can be activated by
engaging only the parking brake. The steps above (1
through 3) are not necessary. Each time the ignition
key is turned OFF, the above steps must be
repeated.
or ya could just buy a video bypass unit for it