What's this button do?
 

I have on 06 CTT and have no idea what this button does. I've looked through the manual but can't find anything about it. It on the lower part of the pillar to left of driver's seat.

Probably turns the interior alarm motion sensor off and/or the angle sensor

Press the top one when you leave your four legged friends in the car (with the windows down in the shade of course)! :cheers:

When should the bottom one be pressed?

Here's a more descriptive version of what wirunner explained in his post. The pages have been copied from the owner's manual.