I've decided to replace the original Blaupunkt HU with an 2DIN Alpine. Also, I wanted to keep the BOSE system.
The new HU is already installed and there's sound coming out from all the speakers, but not everything is OK:
- There's always a static noise in the background even when the volume is at 0.
- When I press Mute, the volume fades away, but not entirely. I can hear clearly the music playing.
- Also, it seems it's transmitting too much power to the speakers, as the sound distorts more easily.
Looks like the HU is sending the signal directly to the speakers without going through the BOSE amp.
I believe everything it's correctly wired. I've followed "shiny_car"'s tutorial (thank you
), and connected the blue wire - labeled "REM" to the blue wire of the car. This should power up the BOSE amp.
I still haven't connected with the RCA's as I couldn't get the adapter yet.
Now my doubt is:
There is a cable with a yellow connector that was connected to the original HU, and now it doesn't have anything to connect to.
Could this be the BOSE amp energy cable?
Another doubt is the black box underneath the original HU.
I don't know if this would be the BOSE equalizer or just the Blue&Me module.
The only label says Magneti Marelli (?!)
If I start the engine with this box disconnected, the KM's start flashing. What is really the funcion of this box?
Thank you for your help and Merry Christmas to all