junmitech - I have a 2005 TSX and last week, I noticed that I have the exact same problem, with just my drivers side door lock.

I did a quick google search and found (on another site, I think it was acurazine.com) that it may be a "lock activator." It should be covered by warranty.

I called my dealership and scheduled an appointment for next week. I'll post again afterwards and let you know what I find out.

jb