yes, the 1990 is the first of the 2nd generation integras.

give some more background on your situation. have the radio EVER worked? also with the seat belts and windows. if your radio needs a code, it will come on and ask for it. if you know how, you can pull the radio and see if power is actually going through the 12+ wires. then you can start to deduct and see if you run into the problem.