The drivers side seat moves forward and back, but will not further adjust. on 2002 Volvo S80

The seat moves up and back, but the seat-back does not adjust, and the memory settings do not work. the seat-belt alarm also does not work. I just purchased this beautifully maintained car, and this is the only problem so far.A dealership wants to do a $100 diagnostic. I think it has to be easier than that.

Asked by for the 2002 Volvo S80
Well it does need to be checked for the problem. Thinking it's easier is someone who doesn't know what is involved in circuit issues. You could replace the seat, that would be easier, but it might not work either.