Activate Golf IV TDI GRA, Login Code

Hi, can anyone help me figure out how to activate the GRA (Gas Recirculation) on a Golf IV TDI engine with the engine code AJM using VAG-COM?
Ideally, the data would come from the repair manual.
A login code number would also be sufficient.

Hello,

You should search the archive and the error database.

I actually only need the login code.

Hello,

You can find it there too.