My brother bought a 1993 Honda Civic and his car won't start, because the alarm systems shut down. The sunroof doesn't open, and the car won't start. The system functions are stuck. What to do?

I guess your alarm wiring interferes with starting the car. Try to troubleshoot alarm wiring first, or disconnect the alarm altogether, and then try to start the car... that way you'll see if the alarm is to blame.

Are all fuses intact?