[Ballistacold]

Hi all.
I'm having intermittent audio issues.
2007 335xi logic 7
I have the protool and cable and everything, not certain where to scan for codes.

No sound at all from any speakers most of the time. Maybe 1 out of 7 or 8 drives around the sound will work and work fine until the car is shutoff again. Then most likely no sound again.

Head unit was faded so replaced with an eonon. - no sound
Replaced logic 7 amp - no sound.
Amp has power and ground.
Fiber optic is flashing red at amp.
Fiber optic is flashing red under the dash.

Not sure what the diagnostic procedure is or what module to check for codes at the least? I've read the new amp needs to be coded or firmware updated? Maybe the amp was fine and it was a problem elsewhere?

Any ideas? I know this is common but I'm a bit slow lol. Thanks.