Remove the passenger's dashboard undercover and the glove box.
Disconnect the connectors (A) from the stereo amplifier (B). Loosen the bolt (C), and remove the nuts (D).
Honda Odyssey Service Manual > HondaVAC™ System Description: Sound Pattern of the Buzzer Pattern 1 ONOFF120±12 ms880±88 ms1000±100 ms Pattern 2 OFFON3000±300 ms ...