Honda PASSPORT 2023 Owner's Manual page 219

uuClimate Control SystemuSynchronization Mode
Synchronization Mode
You can set the temperature synchronously for the driver side, front passenger side
and rear seats in synchronization mode.
1. Press the SYNC button.
u The system will switch to synchronization mode.
2. Adjust the temperature using driver's side temperature control switch.
Press the SYNC button to return to synchronization mode off.
218
1Synchronization Mode
When you press the button, the system changes
to synchronization mode.
When the system is in synchronization mode off, the
temperature for the driver, front passenger, and rear
seats can be set separately.