I opened one up to have a look, the physical fitting is the same as normal sidebars, the wiring is shown as entering vehicle through existing rubber grommet under van entering under seat, cable then runs up A pillar and has plug and play connections to go into main front roof light.
This makes sense if fitting to a panel van as lighting can be separate between front and rear of vehicle so this will ensure sidebars always light up when locking/unlocking
If the vehicle is a kombi then lighting is linked through the van and all comes on and off together so i cant think why it couldnt be connected to step light which would be much easier to get to with little to no trim removal ?!?!