Not sure about the seat belt chime but I recently talked to a GM tech friend of mine. I hate how loud the chime is when you leave the key in the ignition.
I talked to my friend and he said that they can use a techII programmer to change the volume in the ECM.
Just a suggestion. I went to see him this week and had him do a recall on the remote system and forgot to do the chime thing. DUH
Mark
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