Hello, I have the same car as you, a 2009 Citroen C5 X7, In my case the lights work well for me, but the rest of the options such as exterior and interior temperature do not work, climate control and fans from the screen do not work either, I come from another Junsun screen and these basic options did work, I have changed cambus 3 times without a solution since everyone says that the cambus is to blame, and it is not true. From what I see, the DUDU7 system is too green in my opinion, and it needs many adaptations and updates to make it a standard system, I have seen several msg in the forum of people with Peugeot/Citroën with the same problem and they still have no solution, let's see when they give us a joy, Since in my opinion, if they do not have a system prepared and working for a specific brand, they should not sell it as such, in my case after talking a lot with the mekede salesperson and guaranteeing that it was 100x100 compatible with my x7 c5 Citroen, in the end it has not been, so we have to wait until one day they release an update for our cars in dudu7, since in Junsun they do have them more updated.
