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i believe that was for an optional 6 cd charger. Not sure if you can hook up something on the back tho. I would just get an aftermarket deck, they're cheap. You can get one with bluetooth and aux/usb for less than 100$ and just get the conversion harness and it will plug and play. First upgrade i did on my 05
Canada EX and EX-L models came with the CD/AUX button.
It can be used for an auxiliary device. In back of the audio unit, Connector B (14-P) is where an auxiliary wire harness would be plugged in. That port should be empty on a Canada model EX and EX-L.
On U.S EX and SE models, the button was labeled as CD/XM. On U.S. model EX and SE, this was an option to add XM radio as an accessory. U.S. EX and SE models came with the wire harness that ran to the left quarter panel to can be used to plug into the XM receiver (accessory).
Aftermarket has aux adapters that can plug into the Connector B 14 pin port.
This is an example of an aftermarket product that can be plugged into the 14-P port. There are likely other updated products that work and may even be less expensive.