Question about rear sunshade/sunblind retrofit

[Gt4]

I have 2 E46 M3 and would like to swap the rear sunshade/sunblind from one car to the other. Both cars are 2006/04 production date.

I have a question: is the electric wiring for the mechanism is pre-installed on every E46 M3 or only came on rear sunblind optionned car?

The audio wiring harness has extra connectors for retrofit but was wondering if it was the same with the main chassis harness?

[Casa de Mesa]

I looked at my disassembly photos and can't tell. I only see wiring for speakers, rear window defroster, antenna, etc. but don't see anything extra. It might be further up the harness (same as what I think you're referring to for audio harness). My car is at the shop or I'd go out and look...

[Ianb]

Don't believe wiring is preinstalled, there is some info here -

https://forums.m3cutters.co.uk/threads/rear-sun-blind.20327/