In order for the foot pod to pair to the Forerunner 405, 405CX, or 410, the watch will need to scan for the foot pod. To pair the foot pod:
The watch will now give a Foot Pod Detected message.
Try changing the CR 2032 battery if the foot pod does not pair. After the old battery is removed, wait one minute before inserting the new battery. Try the pairing process again as detailed above.