Aston Martin DB 9 2010 Manual page 34

Seat Comfort
The ignition must be ON before the heated seat and lumbar
support can be operated.
[5] - Press forwards or rearwards to increase or reduce the lower
lumbar support.
[6] - Press forwards or rearwards to increase or reduce the upper
lumbar support.
[7] - Press to the rear for the lower heat setting, press to the front for
the higher heat setting. A LED shows which heat level is ON. Press
to the centre position for OFF (LEDs OFF).
3.4
Seat Back Release
Press and hold in button A to
release the seat back, once the seat
has been moved forward release
the button and manually move the
seat back forwards.
In the unlikely event of power
failure a manual release strap is
provided in the seat back. Pull and hold
the strap to release the seat back and
then move the seat back forward.