How do you reset airbag light on 2009 GMC Sierra?

To reset the airbag light on a 2009 GMC Sierra, first ensure that the vehicle is in a safe location and the ignition is off. Disconnect the negative battery cable and wait for about 10 minutes to allow the system to reset. Reconnect the battery cable and turn the ignition to the "On" position without starting the engine. If the airbag light remains on, there may be an underlying issue that needs to be diagnosed with a scan tool.