Pretty sure the 2006 doesn't have a specific steering calibration, since it was still hydraulic. Newer cars with EPS are generally calibrated by turning the wheel fully to the left, then right, then center. If your wheel is off-center, your intermediate shaft or rack is probably misaligned.
After a battery reset, you may have to reset some other things such as power windows & sunroof. For each side, roll the window down a little, then pull the switch all the way up and wait a second or two after the window stops traveling. This re-initializes the automatic function. About the same for the sunroof.
Here's a wiring diagram.