Single chime at engine turn off

[kingrob76]

My 2007 Avalon limited, sitting at almost 60k miles, has started giving me one single chime when I shut off the engine. All doors closed, and no other indications of any problem at any point during operation of the vehicle.

Any ideas?

[grandpapa]

assumed while you are still inside the car with your smartkey with you? would that be low battery signal for the smartkey?
Is it consistent?

[kingrob76]

Yep, inside car, with the smartkey, even with the seatbelt still on. it's very consistent. I've not noticed any issues with the range of the key but I can change the battery just to see.

[Tom in Tacoma]

It's the key fob battery getting low.

[grandpapa]

you should have 2 smartkey, just try out with the other one.