What would cause the drive light to blink on a 2002 Honda Odyssey?

All of the drive lights (and most of the other dash lights) are attached to sensors related to correlated vehicle parts (ie the oil light for oil pressure, gas light for low fuel levels, etc.). When the drive lights start to blink that means one of 2 things, either your transmission is failing or the sensor attached to the transmission is failing. I hope for your case it is the latter. Suspect a bad four wheel drive module, or wheel actuator