It can be used for anything. If you want to use it for fog lights, you can. If you want to use it for a fuel pump shut off, you can. You have two methods to install fog lights:

• Check to see if you are pre-wired for fog lights and then get all associated hardware
• Buy an aftermarket fog light set and use that hole for the switch

 

I understand that it can be used for anything. My question was what did Toy use it for? What device - a switch, a twisty knob, what? did Toy make for that hole? Can I buy the switch? What part number?

On a previous car - a 2000 Camry - there was a dealer part (a switch) made for an existing knockout hole and I was able to buy that switch and install it. I just walked into the parts department with a photo and the parts guy looked up the XLE parts and handed me the switch.
On this 2011 LE the parts guy hadn't a clue... Maybe it was a clueless parts guy....

 

These, use them in the dash knock outs on my T100 for a aux. light bar.

CH4x4 Small Push Switch for Toyota – Auxiliary Lights Symbol – CH4X4 Industries

www.ch4x4.com

RH Door key lock:

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Anything you can think of. What exactly are you trying to do? Just because you buy an OEM switch doesn't mean it is gonna be used for anything in that slot. It's just a accessory slot for anything.

 

I bit of investigating shows it's not for factory fog lights, as that switch is a rotary knob located on the turn signal stalk.
If you want to add fog lights you could most probably use that housing with a switch. You would have to supply your own wiring as there is nothing already there.

 

My 2007 Camry Hybrid has switches in both of those places. One is to activate 'eco mode' for the HVAC system. The other is the gas door release. The hybrids models have push-buttons for the fuel door located there compared to the floor pull on other Camrys.

All Camrys of that generation (2007-2011) that came from the factory with fog lights had the switch incorporated into the turn signal/headlight stalk.