Aston Martin DB 9 2010 Manual page 48

Passenger Seat Airbag PASS AIRBAG OFF Symbol
Empty OFF OFF
Child + Child seat OFF ON
Adult ON OFF
In some cases a small child placed in a child seat will not set the
PASS AIRBAG OFF symbol to ON. If this occurs the passenger airbag
status will be as described above for an empty seat, i.e. passenger seat
airbag 'Not ON' but the PASS AIRBAG OFF symbol will not come ON.
The front passenger sensing system may detect small or medium
objects placed on the seat base. For most objects which are on the
front passenger seat, the passenger front airbag will be disabled. Even
though the passenger airbag is disabled, the PASS AIRBAG OFF
symbol may or may not be ON according to the table above.
3.18
The PASS AIRBAG OFF symbol will come ON for a short period
when the ignition is set to ON to confirm it is functional.
Seating Position
Warning: Even with the Advanced Restraints System,
children aged 12 and under should be properly restrained in the
back seat.
Warning: Always sit upright against your seat back, with your
feet on the floor. Sitting improperly, out of position or with the
seat back reclined too far can take off weight from the seat base
and affect the decision of the front passenger sensing system,
resulting in serious injury or death in a crash.
Warning: Improper installation of a child seat may cause the
front Passenger Sensing system to leave the front airbag ON.
Always make sure that child seats are correctly installed on the
seat. Read the child seat manufacture's installation instructions.
After all occupants have adjusted their seats and put on safety belts,
it's very important that they continue to sit properly. A properly
seated occupant sits upright, leaning against the seat back, and
centered on the seat cushion, with their feet comfortably extended
on the floor. Sitting improperly can increase the chance of injury in a
crash event. For example, if an occupant slouches, lies down, turns
sideways, sits forward, leans forward or side ways, or puts one or both
feet up, the chance of injury during a crash is greatly increased.
If a person of adult size is sitting in the front passenger's seat and the
PASS AIRBAG OFF symbol is ON, it is possible that the person is not
sitting properly in the seat.