Honda Odyssey 2018 Owner's Manual page 256

uuClimate Control SystemuUsing Automatic Climate Control
■
Synchronization Mode
You can set the temperature synchronously for the driver side, the passenger side
and the rear passenger compartment in synchronization mode.
1. Press the SYNC button.
u The system switches to synchronization mode.
2. Adjust the temperature using the driver's side temperature control switch.
Press the SYNC button to return to tri-zone mode.
254
1Synchronization Mode
When the system is not in synchronization mode, the
temperature for the driver side, passenger side, and
rear passenger compartment can be set separately.