Remote control switch use and function.
With rear system on and rear control enabled, the rear passengers can control the functions (except volume) with the remote.
Rear passengers can control the functions, unless the rear control has been turned off by the front user.
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 ...