Bury I currently have the same CAN decoder, but with SW version: V0009, and now it plays the turn signal sounds through the built-in speaker. With the previous CAN decoder, I had to connect an additional speaker for the turn signals, and there was a constant central locking error (red door with a key icon) that would disappear when the turn signal was activated, but it would come back shortly after. And just like our friend UK_Matt already mentioned, double-check all the wiring connections and make sure everything is properly secured. You might also try disconnecting the car battery for an hour.
