Hi,

as you have to remove the relay and fuse treminal, to get access to the plugs at the back side, you may did loosen other plugs. Did you check all plugs in position before putting the terminal back in place?

I did the same modification with a selfdesign solution, similar to yours and everything is working properly.

Check with the wiring diagram, which plug is responsible for your non working feartures and check plugs and fuses.

The retrofit kit does not affect other functions.

Gruß, Markus