Code In PCM
 

I have a problem I just hope you can help me.

The Navigation Unit PCM1 has a code and the PCM display has other code.

But, where is stored the code? one in the navi unit and other in display?,
or is stored in the car memory ?

I want to replace navi unit but seller has not code card, he says code is the same I have in my old navi unit. but I dont see clear because I have seen new pcm navi unit with a grey code card.

HELP!!!