accord door ajar

Hi everyone,
I got a 91 Accord, and the driver side door been replaced. Now the driver door open light is on! I can't get it to shut. I checked the switch, and it doesn't read ground as supposed. The automatic seat belt doesn't retract when I close the door, because it thinks the door is still open. And the buzzer keeps beeping all the time the car is on. It's very annoying. I hope somebody can tell me where is the control unit for this thing, maybe I'll put a new wire or just short it and keep it reading as shut all the time. Any ideas?

Striker/latch adjusted properly?

If you defeat the switch, the seat belt will always be in the way...