You bought it used I am guessing? Did you buy it from a Pontiac dealer or what? If it is used, was it modified in any? There could be a couple possibilities here. One the previous owner disabled it, or two possibly check the fuse box that controls that feature to insure the fuse is not blown or missing perhaps? I am not sure if that is something in the PCM that can be disabled or enabled, but that is also worth looking into. And if you got it from a GM dealer, I would haul it back there and pitch a ***** if all else fails
Just a couple thoughts on that.
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