Looks "automatic"...seems to check passenger seat for weight when seatbelt latched.
Test...get in driver's seat, turn key full on, all lights illuminate, most go out, including yellow "passenger airbag off" light. Turn key off. Latch passenger's seatbelt, turn key on, yellow "passenger airbag off" light turns on, blinks off, then stays ON indicating that the "ORS" thinks there is a "lightweight" strapped into the passenger seat.
I could not find this in my rather thin manual...but I feel it should be there.