Yes, immobiliser needs programming as well. You did just remote lock programming. If you have 2 working keys you can do it yourselt, otherwise dealer`s help will be needed.
DIY instructions:
Insert the first already programmed key into the ignition and turn to position II
Turn back to 0 and remove the key
Insert the second already programmed key into the ignition and turn to position II
Turn back to 0 and remove the key
Key programming mode is now activated and you have ten seconds to:
Insert the unprogrammed new key into the ignition and turn to position II
Turn back to 0 and remove the key
Allow 10 seconds to pass for the system to exit programming mode.
Coss
February 2009