Grand Vitara SUVs from the 2006 through 2011 model years and SX4 small cars from the 2007 through 2011 model years are involved.
Sensor mats measure passengers' weight and determine if the air bag should deploy. Determining who sits in the seat is important because the force of an air bag can injure children or small adults.
Suzuki says the mats can stop working after repeated flexing. If that happens, the bag will deploy even if a small person is in the seat.
The automaker says there are no reports of accidents or injuries due to the problem.
Suzuki will notify owners starting next month. Dealers will replace mats for free.