[FKI]

I'm having an issue where my car can't seem to detect my key when starting the car. The issue happens in both of my key fobs. I took it to 2 BMW dealerships, and one could not identify the issue, while the other said interior antenna failures are rare and it is most likely the key fob. The fact that it happens with both of my fobs makes me almost certain its the antenna. The issue only happens when the key is in my pocket in the drivers seat and I press the start stop button. However, if the key is placed anywhere else in the car (such as the passenger's side or in the rear), the car starts without any problem. I have found a diagram of the antenna online and believe it is the interior antenna on the front left side. I could not find anything online on where exactly it is. I have no issue unlock/locking the car with the key fob using the buttons. While I don't have any issue unlocking the car using the comfort access door handle, there is an issue sometimes when locking it by holding my finger up against the ridges on the the driver's side door handle after accessing the car. However, I still think the issue is with the interior antenna as there has never been an issue with unlocking the car when I grab the door handle.

[Homersbud]

When the fob is in my pocket, i can't start my f48, either. Once i take it out, all starts fine.

[Billfitz]

The side antennas are underneath the trim panels that are below the doors.

[FKI]

Originally Posted by Billfitz

The side antennas are underneath the trim panels that are below the doors.

Those seem to be for the exterior antennas. I'm looking for the interior antenna (labeled in the diagram as "1") with part number 65209220832

[FKI]

Originally Posted by Homersbud

When the fob is in my pocket, i can't start my f48, either. Once i take it out, all starts fine.

Have you tried using your spare fob? I am having this problem with both fobs so I am almost confident it is an antenna problem.

[FKI]

Finally figured out what the problem was after reading this thread: https://f30.bimmerpost.com/forums/sh....php?t=1396657

Turns out some eBay projector lights somehow interfere with the key detection system. Can't really fully explain why, but I as soon as I took out the projectors all my issues disappeared.

[tpo209]

Anybody know where the antenna in the trunk is? My trunk comfort access isn't working but front doors are.

[gameson]

Originally Posted by FKI

Finally figured out what the problem was after reading this thread: https://f30.bimmerpost.com/forums/sh....php?t=1396657

Turns out some eBay projector lights somehow interfere with the key detection system. Can't really fully explain why, but I as soon as I took out the projectors all my issues disappeared.

Projectors emits frequency and it seems it uses the same frequency as your antenna, hence the interference that cause the left side antenna doesn’t work as intended

[Billfitz]

If that's true they're not meeting FCC regulations, which really shouldn't apply to LED lamps, as there's no reason for a lamp to emit RFI. But that's one of the things that Asian sources tend to be lax on.

[paul e]

Originally Posted by tpo209

Anybody know where the antenna in the trunk is? My trunk comfort access isn't working but front doors are.

Never a good idea to ask a separate question in a thread. It just gets overlooked.

Suggest you start your own new thread.

[tpo209]

Originally Posted by paul e

Never a good idea to ask a separate question in a thread. It just gets overlooked.

Suggest you start your own new thread.

Such a useful response thanks so much.

[paul e]

Originally Posted by tpo209

Such a useful response thanks so much.

Trying to help, you’ll notice you got zero response.

But you do you. And you are so welcome.

[Onizukachan]

Well said