^That. Or tap the ACC wire at the radio harness. Usually red on aftermarket harnesses. Forget what color BMW uses (red/white maybe?).

As with most 12v electronic problems, there are going to be multiple ways to skin this cat.

So a little digging around and I think I have a better plan to trigger the head unit for a reverse event (if needed). Our electrochromic rear view mirrors get a straight 12V (not PWM) signal from the LCM on pin 39 and goes to pin 1 on the mirror plug (black/green) to disable dimming when in reverse. I can tap into that wire easily right next to the glove box/head unit wiring area.

^That sounds elegant. :thumbup:

Would do the same but I want the PDC button trigger too so I might as well do all my tapping in the rear. :dunno:

I really like the functionality that you guys figured out on the PDC button. Being able to command a view by a simple button press is logical, effective and more ergonomically OEM.

I guess I will just have to command a momentary view (outside of a reverse event) from within the head unit camera app.

There was another thread where the pdc was used to trigger it by tapping to one of the wires on the pdc module but the voltage was really low and needed a micro relay and making your own control box or something. Really neat but I don’t have the slightest clue in making one even with instructions lol

So... I thought I could power up the camera from the right rear fuse box tied into the radio or navigation fuses. Ha, problem is all those fuses back there are sleep enabled switched power. I was specifically looking for terminal 15. :banghead:

My next approach is PDC module X300 (black connector) pin 1 for terminal 15 switched power and pin 6 for ground.

What about the flat blade type distribution block that's behind the 12v cigarette plugins in the cargo area? The one mounted to the back of the body panel. Not sure what all comes off of it but it's before the fuse block.

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Those are grounds. All brown. I thought about the cigarette lighter power too, but again, those are sleep enabled so I think with the camera powered off that circuit it would cause it stay awake and cause the parasitic drain issue.

Well crap. Sorry I thought it was a power distribution block but I hadn't pulled the interior there yet....

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Is there a reverse wire in the trailer plug wiring? That would be 12v surely?