No Power at Center Mirror?

[DrMrFancyPants]

I have a 23' Pro ER. Purchased one of the power adapters off of Amazon that connects to the wire connector going to the rear view mirror and provides USB power such as for a dash cam. When I hooked it up, no power. So I tested the black and white wires that are spliced off of the factory wiring and turns out there is not 12v power to the rear view mirror, at least not on these pins. Is this normal? I also tried and failed about a year ago to connect the rain sensor. I assume that also has no power which is now a known issue and there is a wiring harness that can be purchased to run from the steering column to the mirror cover. However I believe it only provides power to the rain sensor, it would not also provide power to the rear view mirror would it? Is there another way to get power to the rear view mirror?

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[B177y]

I have a '24 Pro and I just installed a FitCamX that plugs into the mirror harness. Camera gets power and the mirror still dims.

Does/did your Pro mirror automatically dim at night prior to the camera install attempt? Does it work now if you connect it normally without the camera bypass harness? If it works, it's getting power from somewhere.

Have you checked the fuses to make sure you didn't blow one while unplugging or adding the new bypass harness for the camera?

This would be my troubleshooting algorithm to try, let us know if there's any results from this. I can't think of anything beyond those basics. If the mirror doesn't work now or never worked prior, you can try the dealer/warranty route assuming you're still under 36,000 mi. Remove the bypass harness and plug the normal mirror harness back in before bringing to the dealer.

 

[bmwhitetx]

All 2023 Lightnings have the auto-dimming rear view mirror as standard equipment.

Like @B177y says, check your fuses. Looks like it is powered by Fuse 36 in the BCM (passenger scuff panel). The mirror connector is 16 pins. Pin 1 is power and pin 4 is ground.

NOTE - the mirror is powered only when vehicle is ON.

 

[SFsparkie]

I noticed the harness for my dash cam has an inline fuse covered by black tape. Could that be blown if you are reading voltage from the harness?

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