Jayblack

Hi, i got my 2006 C Class coupe tinted and the central locking stopped working. Took it to a garage got it diagnosed and the computer said that the door control module was faulty, he said it was probably waterlogged from the tinting procedure. I changed the modules for both sides and still nothing! He said the key had to be programmed to the new control units. Is this true or did he just not do the job properly?!!!