Aston Martin DB 9 2010 Manual page 25

Programming
Step 1 erases all programming. It only requires completing if
programming Homelink for the first time or when erasing all existing
programming. It does not have to be followed to program the other
HomeLink buttons.
The HomeLink buttons can be reprogrammed individually but
not individually erased. Step 1 must be completed to erase all
programming.
1. Press and hold the two outer
HomeLink buttons, releasing
only when the HomeLink LED
begins to flash after 20 seconds.
All three buttons are now cleared. The HomeLink system is now in
setting mode.
As a security precaution make sure that all programming is erased
in the HomeLink system before selling this vehicle.
2. Hold the original remote control of the device to be
programmed at a distance of 4-12 in (10-30 cm) away from the
HomeLink transmitter unit keeping the LED in view all the time.
The distance between the remote control and the transmitter
unit depends on the system being programmed. You may require
several attempts at different distances. Maintain each setting position
for at least 15 seconds before trying out another.
3. Using both hands, simultaneously push the remote control
button and the desired button (1, 2 or 3).
4. The LED will flash, first
slowly and then rapidly.
When the LED flashes
rapidly, release both
buttons. The rapid
flashing LED shows
successful programming
of the new frequency
signal.
Operation
The vehicle should be within the operating range of the gate or garage
door opener and the ignition should be ON.
2.15