No you just need the 4 digit code,Its pretty much plug and play.
The only prob you will have,If your car is older than 2008 you will need
a different can-bus gateway,this is a small black box that talks to the stereo
through the ecu and tells it to shut down once the car has been turned off for a while.
If you have an old can-bus the stereo doesn't shut down and the HDD keeps running and your
Battery will go flat, the other option to prevent this,is to change the Firmware of the stereo
to an earlier version