One problem related to air bag light on has been reported for the 1999 Nissan Frontier. The most recently reported issues are listed below.
Both lights and attachments by license plate fell out. Both bulbs and attachments were lost while driving 1 or two weeks apart. Airbag light flashing in past month. Have had mechanic check out and states fuse and everything is okay but the airbag light flashes continuously while vehicle is on. Firestone tires blew out at sidewall x2 tires at 30,000 miles. This was the original tires with vehicle bought brand new. Nissan or firestone stated could not reimburse for loss.