LFB illumination won’t go out!

Hello, I have the following problem, my steering wheel remote control will continue to glow after I’ve finished! It doesn’t go out after a long time, but always lights up. The problem is of course the battery….. Well my question is, is there anyone who knows anything? Or is there any relay that is capable of doing so, or does it get electricity from the radio? Which would surprise me, as this actually turns off. Whether now only the LFB power is pulling I can nciht say, on each n case, it’s enough to flatten my new Varta! Hope someone can help me Thanks Greeting KABN PS: Is a facelift