2010 Honda Civic Owner's Manual - Page 107

Seat Heaters Passenger's Seat In the HI setting, the heater turns off when the seat gets warm, and turns back on after the seat's temperature drops. In the LO setting, the heater runs continuously. It does not cycle with temperature changes. Follow these precautions whenever you use the seat heaters: SEAT HEATER SWITCHES Instruments and Controls HEATERS Driver's Seat If equipped Both front seats are equipped with seat heaters. Because of the sensors for the side airbag cutoff system, there is no heater in the passenger's seat-back. The ignition switch must be in the ON (II) position to use the heaters. Push the front of the switch, HI, to rapidly heat up the seat. After the seat reaches a comfortable temperature, select LO by pushing the back of the switch. This will keep the seat warm. Use the HI setting only to heat the seats quickly, because it draws large amounts of current from the battery. If the engine is left idling for an extended period, do not use the seat heaters even on the LO setting. It can weaken the battery, causing hard starting. 101