Pioneer AVIC-X1 Manuel D'utilisation page 24

Installation
When the Hide-away unit is installed under the passenger seat, etc., use the installation
board.
2. Decide on the installation position, and drill the holes.
3. Secure it firmly using the self-tapping screws.
23
Installation board
Drill holes of between 4
and 4.5 mm in diameter.
Self-tapping screw
(6 × 16 mm)
Mark up the positions
for drilling the holes.