sony cdx m610 lost reset code?

I have an m600 and all I have to do is hit the reset button on the top left w/the face opened with a small point like a toothpick .I looked through all my manuals but didn't find any code info or yellow paper. I went to eserviceinfo dot com and found your model service manual and it shows that same switch on a pcb layout.Hope this helps.

Bill
December 2006