2010 Hummer H3T Owner's Manual - Page 50
2010 Hummer H3T Manual
Page 50 highlights
3-6 Seats and Restraints This feature heats the cushion and seatbacks. Press the top of the switch to turn the heat to the high setting. Press the bottom of the switch to turn the heat to the low setting. Put the switch in the center position to turn the heat off. The ignition must be on for the heated seat feature to work. The seat will heat to the last setting if the ignition has been turned off and then turned back on. For the heated seat feature to work on the passenger seat the safety belt must be fastened. On vehicles with this feature the controls are located on the outboard sides of the front seats. Heated Front Seats { WARNING If you cannot feel temperature change or pain to the skin, the seat heater may cause burns even at low temperatures. To reduce the risk of burns, people with such a condition should use care when using the seat heater, especially for long periods of time. Do not place anything on the seat that insulates against heat, such as a blanket, cushion, cover or similar item. This may cause the seat heater to overheat. An overheated seat heater may cause a burn or may damage the seat.