On my 2004 Lexus GX 470 there is a button to the right of the steering wheel on the knee panel. It is a push-on/push-off with no identification. It is shown in the owners manual but not identified. What is it and what does it do?

I hope someone is out there!!

Am I the only one with this button?

Help!!!!!!!!

I am not sure I have it totally figured out but this button appears to turn on and off the tire pressure monitoring syatem that is not covered in the owners manual.

Correction: this button turns off the tire inflation warning light on the instrument panel.

Am I the only one that has this?