I've never used the process car feature, just the process ECU. I coded each individually.

If I remember right... I had to add the trailer zoom feature after, but it was only changing a simple code I believe.

Did you follow my post and write the extra code in the FRM? I also had to write a bunch of code into in the AHM. Also, you leave "SL_BEI_KZL_AKTIV" alone, and just write nicht_aktiv.