Recently had my fog lights polished and noticed it looks like there might be two bulbs. The fog light bulb and perhaps a side marker light I would think that comes on when you turn on your turn signal either left or right.
A search turned up only overseas Celsior had them?

Owners manual pg 517 show's a 5 watt type D bulb. But no mention of when it turns on.

Anyone?

 

Our US cars just have a blank space there.
You can tap into the turn signal and add a bulb there if you like though, I did it and it's pretty straightforward