This has happened twice, First time I wasn't sure but second time, well....
I parked in my normal spot, slight downhill, put it in park, shut off the lights, remove seatbelt and key as I open the door. I hear the warning light like the lights are on but they are not on. The key is in my hand. I put the keyback in and turn it on (not start) then back off and the warning chime goes away. Maybe I am removing the key before the lights are off, or ?? I do it all pretty quick as I am done with work and tired. Anyone seen this? I'll try to figure out more as this is the same routine every night. Everything seems to work OK.