OK,I had a look in my factory manual:
The connector on the seatbelt should have 2 terminals ,one for ground and one leading to the BCM.
The seatbelt switch closes the ground path if seatbelt is not fastened.
To test the connection between the BCM and the seatbelt,you īd have to ground both terminals (actually only the one which leads to the BCM, but I donīt know which colors your wires have so just ground both...)
After you grounded the terminals of the connector, switch the ignition on (engine not running). If the connection is ok, you should hear the chime.
If you hear the chime Iīd say your seatbelt switch is stuck or faulty...