I have a device I can put inline with interior lights that will hold them on for an additional 10 seconds then fade slowly to off. Or if they are on and ignition is turned they fade without delay.

Lovely look

But I noticed on my 560 SEL that with the front doors open, only the fronts come on. Same for back. Which I think is normal. Is it? If

it is I can only wire up the front or back with what I have. Or I need to tie them up so when any door is open they all come on.

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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car