The starter of this thread (Freefly) said the light came after he installed a new stereo... I'm pretty sure that he disconnected the passenger seat airbag light (in the part of the dash that he removed) and tried his new stereo with the dash not re-installed... The airbag computer sees the missing light and signals it as a fault.
To avoid this problem (and work on the stereo with the center part of the dash removed) you should let the light plugged but unscrew it from the rear to free the dash panel.
To avoid this problem (and work on the stereo with the center part of the dash removed) you should let the light plugged but unscrew it from the rear to free the dash panel.
