Mjd5182

Hi, I recently bought a 2011 Citroen relay lwb high roof, was all fine until last night, the fob stopped working the locking but the indicators where flashing, I changed the battery and now nothing ! Not locking no lights nothing !! Checked all doors are closed properly, noticed the side door catches are already packed out etc .... I'm lost, will the key need re programming ? ( forgot to mention the key starts the van & locks opens etc) thanks in advance guys