Interior buttons not lighting up

[JohnCalifornia]

Hi, I was out in my Cali the other evening and noticed that my stop start and front parking sensor buttons don’t light up red like the rest of the buttons in the cab when the head lights are on. I didn’t think much of it until I was looking at pictures of a similar Cali on AT and they were lit up red like all the other buttons. When the buttons on my Cali are pressed they light up orange and they obviously work as I always turn the stop start off when driving and use the front parking sensors when required Could there be a bulb behind them that’s gone or am I missing something simple?
Thanks for any replies