Why does my 1990 Honda Prelude Si door and seat belt light stay on?

The door and seat belt light on your 1990 Honda Prelude Si may stay on due to a malfunctioning door switch, which indicates that the door is open even when it's closed. Additionally, a fault in the seat belt buckle sensor could also cause the light to remain illuminated. It's advisable to check both the door switches and seat belt connections for any dirt, damage, or disconnection. If the issue persists, consulting a mechanic for further diagnosis may be necessary.