Location: Driver's side door panel directly behind and adjacent to the speaker.
Noise description: Noticeable, almost constant rattle/ticking.
Fix method: Removed door panel and secured loose wiring harness behind door panel. It looked like a factory clip to secure the wiring harness was installed but never secured to prevent the wiring harness from moving and vibrating. Noise is completely gone and door panel is tight and silent.
Warranty/BMW Service Action? None. Self-fix in about 10 minutes.
Thread link? None