Today I went to start the car and got "I-Key System Fault" on the dash display.
As far as I can tell, the car seems to run fine, and all i-key functions continue to work. Remote door lock/unlock, Drive/Reverse/Park, etc.
It pops up the "I-Key System Fault" on every startup and shutdown.
I tried both keys, same result.
I did try the proximity key power on p5-10, but no change. Seems like the battery is fine. There is just some stuck message about "I-Key System Fault".