Turn on the floor light permanently in the case of an unoccupied vehicle – how?

Hello together someone has already discovered of you a possibility to let the stand light in the parked vehicle light permanently without someone sitting in the vehicle?? I recently had a situation where I stopped in the dark to help someone. I want to at least permanently light the vehicle with the stand light. However, all lights turn off automatically after a short time, whether I had activated them manually or not. The mobile phone as “Zündsc Hlüssel” of course stayed in the car. Then the M3 is absolutely unlit and extremely risky on the road. Very dangerous. There would be an advantage at least to let still better dipped light shine permanently. The same topic would be with a spontaneous help at night with someone with accident, if you are even obliged to stop. There you quickly become a victim. Does anyone have a solution here? The operating instructions also give nothing. One could of course artificially with some weight outsmart the driver’s seat contact switch, then it would work. But that’s not my approach. Thanks for the answers. LG