I have a 2009 doing the same thing lights flash when I unlock it with the remote. When I lock it the doors lock but no horn honk or flashing lights. My horn works when pressing the horn button. Mine did work and just stopped working like it was. Did you figure out what the cause was? Mine has a hood switch I unhooked it and looks fine. Is there anyway to test this switch or bypass it to see if the alarm will arm?