Who does not know it: the bass behind the driver's seat gets out every now and then, or it doesn't work at all! Here some people resort to the solution of sticking and stabilizing the relay. The whole thing can work and last for a while, but this method should be used with caution (short-circuit spark fire).
 The better method is to solder in a new relay. I've made the experience myself and it does what it says on the tin. We need bass, bass ...
 Scope of delivery:
 relay
 assembly Instructions