I had the same problem - did an internet search and came up with:

Honda Technical Service Bulletin #99-022 "All power locks and left hand power windows Inoperative"

The bulletin states that the probable cause was “interrupt in power to the multiplex control computer.” The bulletin listed a “multiplex control unit wake up procedure.” The procedure had 5 simple steps:

1. Turn the ignition off.
2. Turn the wiper intermittent time ring to the middle position.
3. Turn the ignition on.
4. Verify the operation of all power windows and power door locks.
5. Return the vehicle to the customer.

It worked!