You can set the temperature synchronously for the driver’s side and the passenger’s side in synchronized mode.
1. Press the SYNC button.
2. Adjust the temperature using the driver’s side temperature control dial.
Press the SYNC button to return to dual mode.
When the system is in dual mode, the driver’s side temperature and the passenger’s side temperature can be set separately.
Honda Civic Owners Manual. Accessories
When installing accessories, check the following:
Do not install accessories on the windshield. They can obstruct
your view and
delay your reaction to driving conditions.
Do not install accessories over areas marked SRS AIRBAG, on the
sides or backs
of the front seats, on ...