airbag light on

the airbag light on my 99 ext cab is on, is there a harness under the passenger seat that might have a loose plug, there is a switch on the dash to turn the passenger seat airbag on and off, i know there is one under the driver seat

To find the problem.
First thing it needs to be put on a Air bag capable scanner and get codes and read out air bag system data.

Air bags are like a loaded shotgun with safety off.
They can kill or save your life in a split second.

Air bar repair is best left to the professional that is trained in air bag repair.