Fasten your seat belt or live with it, it will stop after a few moments.
Under the seat is where the seat belt sensors are located. By disconnecting these it should stop the noise.
The easiest way is to use the seat belt. There is also a method to described in http://forums.genvibe.com/zerothread?id=18678 for 2005-2007 models
To disable the seat belt alarm on a Chevy Colorado, locate the alarm fuse. Pull out the fuse to disable the alarm.
I find that fastening the seat belt disables the alarm immediately
Wear the seat Belt !
Yes. Put the seat belt on.
look for the wire on the seat belt and follow it until you find where it plugs in under the seat and disconnect it.
Put your seat belt on
To disable the seat belt alarm in a Chevy Trailblazer, you typically need to buckle and unbuckle the seat belt multiple times in succession. Start by buckling the seat belt, then unbuckle it and repeat this process about three times within a short timeframe. After doing this, the alarm should be disabled. However, it's important to note that disabling the seat belt alarm may not be recommended for safety reasons.
It should have the shoulder and seat belt.
Look under the seat or at the seat belt anchor point and see if the wire for the alarm has been disconnected.
You cannot deactivate the seat belt alarm. It is installed to keep all riders in the vehicle safe.