I have been searching all over for this and haven't come across anyone who has had the same issue. Out of the blue, my horn stopped chirping when pressing the lock button twice on my keyfob. I have checked the DIC and the horn chirp is set to on. I have tried toggling it on/off, but no luck there either.
Any ideas? I had to install a new tpms sensor and I can't get it to go into the learn mode. I am assuming this is becuase I am not getting the horn chirp when locking. It is a 2008 Grand Prix base with factory keyless entry.
thanks,
Josh