From bigclivedotcom.

Having seen an interesting car fuse box which had been wired with discrete wires routed very accurately in a form, I thought I’d get one to take a closer look. But mine turned out to be very different, with multiple PCBs and a neat busbar system.

This also explains why some vehicles can’t just have the fuse box swapped between two identical vehicles without flagging up a fault. I’m not sure what data is stored on this unit. It might just be to identify a specific configuration of fuse box, or it might be locked to a vehicle with a VIN code and possibly even odometer data to protect against mileage tampering on used vehicles.

Or it might just be to gouge the customer for programming fees at the dealership.

This unit was bought from an eBay vehicle breaker, and is apparently from a Nissan Micra/Note.

To see how complex it is just to change a module, here’s a link to L1 Automotive Training:-
https://www.youtube.com/@L1Training/videos

And of course, one of the best vehicle repair channels – Eric-O at South Main Auto:-
https://www.youtube.com/@SouthMainAuto/videos

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