[M135imike]

Hey bimmers!

I've recently had NBT retrofitted, I'm having an issue where my sound will only come on if the car is completely turned on (engine running).

If I press the start button once without my foot on the brake to start it, the head unit comes on etc, but I get no sound at all?

I've read about tapping into the 'thinnest' wire on the amp, which I've found is a black one, and running it to the fuse box, but that doesn't seem to be fixing the issue.

Im coming from business nav in a 2014 M135i (can't seem to get replies on the 1 series forum)