Ok.. Hello my horn only works when my engine is off.. the remote lock unlock buttons will sound horn.. when I have the engine off.. not to sure about if the horn will function with the key forword but not on.. also my OnStar rear view mirror seems to have a short that only starts to flicker on and off after I have been driving the vehical for 20 minutes or so.. it seems to be once the engine warms up,the rear view mirror starts to flicker on and off.. any ideas?..