Sometimes my car honks once when I lock it with the remote. I know its trying to tell me something aint right but when I unlock and then lock again there is silence. It doesnt do it everytime, and I wondered if its something to do with the interior lights not fading out before I push the button. It's a mystery to me. Any ideas. Yes the car still locks OK.

 

I believe that if you push the remote button twice in quick succcession when locking, it disables the interior motionsensor; the horn chirp just lets you know that.

 

stuart - the horn will sound if something is "open" in the car. I took my dog (miniature Dachshund – yeah, German car, German dog ) to the vet the other day and when I locked the car, the horn sounded. Apparently when my dog was moving from the rear seat to the front seats, he stepped on the button that opens the center armrest cover. That is what was triggering the horn to sound. After closing the cover, the car locked without sounding the horn.

 

Your cneter console armrest may not be closed properly. Or perhaps the trunk is not fully seated.