Roll Bar: I suggest reading the diagnostic codes from the roll bar controller. The method is explained in several threads.

Seat Belt Light: this can be switched-on by either of two little "safety package" control modules under each of the two front seat cushions. There may be a problem with the wiring from one of the switches on a seat back rest to a control module. If you want to pull the lower seat cushions and check the wiring, I can tell you what points to measure.