how do I get my nissan altima air bag light to stop flashing?

2010 Nissan altima. Husband was fixing carpet and upon hooking the system back up, the air bag light is continuously flashing and the light on the dash shows the air bags are off. We can't reset it. The hand held device for checking out problems shows nothing is wrong. Lights weren't flashing before he unplugged system.
sharon, August 2015


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