Aston Martin DB 9 2010 Manual page 84

If the tire warning symbol comes ON while driving, reduce speed to
30 mph (48 km/h) and stop in safe place as soon as possible. Do not
stop the engine.
Ensuring that neutral has been selected and that the parking brake is
applied, check the status of the control unit LEDs. After noting the
control unit LEDs status stop the engine and follow the actions listed
in the following tables.
4.22
Warning Symbol: Constant.
Message Centre (Right): Check Tires.
Control module: Control module LED constant green. Tire LED(s)
constant red.
Fault: Tire pressure below specification.
Action: Check the tire pressure of the affected tire(s), shown by the
tire LEDs on the control unit. Re-inflate the affected tire(s). After
inflating the tire(s) to the manufacturer's recommended inflation
pressure as shown on the Tire Label (located on the edge of driver's
door or the B-Pillar), the vehicle must be driven for at least five
minutes over 20 mph (32 km/h) before the warning symbol goes OFF.
Warning Symbol: Flashing for 75 seconds then constant.
Message Centre (Right): Tire System Fault.
Control module: Control module LED flashing amber.
Tire LED(s) constant amber.
Fault: Tire transmitter fault.
Possible Cause:
• Wheels and tires have been installed which do not have TPMS
sensors
Action: Continue at a reduced speed of 30 mph (48 km/h)
maximum. Have the TPMS checked at the earliest opportunity.
Consult your Aston Martin Dealer.