Canbus uses various models to control various parts of car’s electrical systems to keep wire numbers, length, compilation and costs down as ever more features and interlinking becomes necessary. Data connection between the modules carries command information on one wire rather than having one circuit for each function.
Step light and tgate open light take control from rear cab idpm
Cabin light is controlled by roof c/u
You may want to look in that direction if you dont solve the problem
Have a gud un!
I bought LEDs from the ElgrandOC shop, and then looked at the posts of people blowing control modules etc. which was worrying. Decided to just do it anyway and see what would happen. Changed front map lights, step lights and above rear door lights recently, all working perfectly! Some where harder to replace than others with my non-existant practical skills but very happy with the end result!