a lot of the newer cars have these funny canbus systems where even one part of the seemingly unconnected wiring can affect everything

so put the wires back to the way they were, if everything was working then it stands to reason that putting things back the way they were "should" put things back to the way they were

i know that on my mondeo, if i don't wire the interior lights to the feed and return for the same light loom things get all fucked up