2005 tacoma air bag problems

The light on my dash shows passenger air bag is off.how do i turn it on

 

Where on the dash is it located? Hard to tell from the pic.

 

I think it has a sensor to tell if someone is sitting in the passenger seat. It should automatically turn on when someone is in the seat.

 

By default most vehicles have the passenger air bag turned off if there is no one in the passenger seat. Saves a lot of money in an accident since those things are pricey to replace.