You are correct, I hardly ever use mine, last year I wanted to use it as my wife was standing by the door waiting to get it, I said f*** it and drove on. She was not impressed.
Seriously I like things to work, that switch and the drivers bum warmer does not work, I really never use the seat heater but it bugs me anyway.
One more look at the lock switch and I will forget about it for a while.
The switch puts out two voltages and the earth is good, I hate to be beaten by this.