Hello.
Just bought a 2014 TC Series 10, and do not know what this mini toggle switch on the left panel below the mirror switch is. It is almost all the way down at the bottom of the panel, is round and about the size of a dime. The dealer did not know what it was either.

 

Turns on and off one of the lights can't remember which might be the dash if I remember correctly

 

Nope, nothing is affected by it.

 

You said it then bud. It does nothing.

Why did you ask then?

 

That makes no sense.
Why would it be there then?

 

I've always heard those switches toggle that scion light on the dash that the 10 series' get. If not you could always pull off the panel and see where the wire goes...

 

More switches. It needs More Switches.

 

I know this is very late but i also have a 10 series and that switch toggles the interior "scion 10" logo right above the radio on and of.

So everytime you open the door the logo will appear.