HelloCustomerand welcome to justanswer.com,
Do all the locks not work?
Have you tried to reprogram the remotes?
What year is your Odyssey? I believe the reprogramming procedure is the same, I will send you the procedure for the USA model of the same year.
It is a 2000 Honda Odyssey (RA6) but this model never made it to the US. It has the 2.3Litre 4 cyl engine not the V6 and has normal car type rear doors instead of the sliding ones. see this link - http://en.wikipedia.org/wiki/Honda_Odyssey#Second_generation_.281999-2003.29
Thanks for the info. I have enclosed the procedure for the last Odyssey with the same type of body style. try this procedure and see if it works.