Its not the extra electrical toys that are the problem, its the fact that their cars leak!
its water getting in and corroding and shorting the unsealed looms and PCB's.
A bit of conformal coating and some decent weatherproofing on the exposed sections of the looms would fix most problems.
The only secret that should get out is how they get away with charging soo much for spare parts for cars that are less than 10 years old!
and dont even get me onto the Anti-EU Regulation, Anti-Competative, Closed practices regarding CLIP diagnostics on all the OBDC-II / CAM-BUS fitted cars
if we Renault drivers want to PIMP our cars up, we should be able to!
along with being able to fix our cars without being forced to flush money down the drain on OverPriced Renault Dealership Clip diagnostics checks after which the mechanics still cant fix most faults first time without replacing almost all the wiring and electronics modules.
(which must be supplied direct only by renault and not from spares from scrapped cars).