Hello and welcome to Just answer.com, Super mechanic here. About your vehicle.
There may be a problem with the seat belt control module being that it is both seat belts.
You will want to check the fuses (#1 and #16) of course and then the module. Here is a diagram of the airbag that shows the fuses and a test for the SCTM.
SYSTEM OPERATION A seat belt retractor latch solenoid is integral to each of the two outboard front seat belt retractors. The solenoid is grounded at all times through its wire harness connector and circuit. The solenoid receives battery current, which is switched by the Seatbelt Control Timer Module (SCTM), through a fuse in the junction block.When the seat belt retractor latch solenoids are energized the retractor spools are unlatched, and the seat belt webbing can be withdrawn from the retractor. When the solenoids are de-energized the retractor spools latch, preventing the seat belt webbing from being withdrawn any further from the retractor.The seat belt retractor latch solenoids cannot be repaired. If the solenoid is faulty or damaged, the entire seat belt retractor unit must be replaced.
Seat Belt Retractor Latch Solenoid