Toyota key wont turn past acc

I have a 2009 Enclave that now has the keys stuck in the ignition and won't turn past the ACC position and so cannot be removed. I can start it fine, the battery has lots of juice. I've had to disconnected to positive terminal at the fuse box under the hood. Also, the rear lights (brake, running, signal) are not working.
Things started with the drivers controls for windows not working, and from there, the heat seat (driver side) stopped working, although the lights indicate that it it on "high." The latest addition to the issues is that now, when I use the remote lock, or put the car in gear, only the rear doors auto-lock.
I have checked all fuses, replaced respective relays, and even replaced the BCM ($650.00 I could have done without dishing out...) only to still be in the same spot I was before.
Can anyone offer something that makes sense?

Thanks in advance, Mike

Who installed the BCM? Is it in warranty? Have you has any water leaks?
Just one more thing. How old is the battery, lots of gremlins reported associated with low battery voltage in past posts.

The BCM was dealership installed, (once installed, it cannot be returned, but would be under warranty, if it were defective) and there are no water leaks anywhere. The battery is fully charged, and alternator is putting out 14V

The BCM was dealership installed, (once installed, it cannot be returned, but would be under warranty, if it were defective) and there are no water leaks anywhere. The battery is fully charged, and alternator is putting out 14V

I'm having the exact same issue on my 2011 Enclave did you ever get official results

Part number 20793134 SL-N-HOUSING

My 2011 Enclave is doing the same thing off and on, haven’t replaced the ignition switch housing yet. Just remove the top plastic steering column cover and you can reach in and press the plunger on the right side of the column when sitting in the car (see plunger shown in picture) and it will let you turn from ACC to OFF then remove key.

The key-in lock is not being deactivated. This can be caused by several things, such as it doesn't think you have put the vehicle in Park even though you have. The problem is in order to correctly diagnose this issue, you have to be able to know what prevents the key-in lock from being deactivated and then read those values to see what the body computer (BCM) is seeing. Was the BCM replaced for THIS issue and if so, who diagnosed it. Unfortunately I'm not familiar with this vehicle as I was with Land Rover for the last 20 plus years prior to retiring. Your other issues sound like a Can Bus problem and may or may not be related to the key issue. Unless you can come up with a scanner to read real time values it's all guess work. What I would do in the meantime until it is repaired correctly is open the power OR ground circuit to the key-in lock which will prevent it from activating. Keep in mind that the key can then be removed at anytime including while you're driving down the road. These type of safe guards came about because some people should not be driving vehicles and the lawyers get involved. Sorry I could not be of more help and good luck.