the central locking key is flashing red and will not open or lock my car. l cannot open or lock my car manually using the central locking key either. l have had the battery within the key changed but nothing has changed. any ideas what could be the problem? and how can l fix it ?? thank you

OK its the relay for the central locking the control unit under the glove box but l think its the relay if it was the control unit the relay would click or you have a weak fuse l would replace the fuse first a work to the relay all the relay are in the fuse box