OEM tweeter wiring on UK Yaris

[Paul Evans]

Hi Guys.
This is a bit of a long shot, but I'll ask anyway. I live in the UK and have a 2009 model Yaris SR, which has inbuilt tweeters and airbags in the A pillar.
I don't think US-spec models have OEM tweeters, but I know some other markets do, not just the UK.

I am thinking of replacing the headunit and the front door speakers and tweeters (with component speakers). Lots of threads on these forums about replacing headunits and door speakers, but I can find nothing about replacing the OEM tweeters. If possible I would like to put my new tweeters behind the existing grilles for a stealth look. However, reading the Yaris manual I am nervous of messing with the A pillars since there are airbags there. There is nothing in the Yaris manuals or wiring diagrams which explains how the OEM tweeters are wired, or how they can be accessed.

So - anyone done this? Is it possible to get the tweeter grills and/or tweeters off the A pillars without removing the entire A pillar inside trim? If I take the A pillar trim off, the manual says there are airbag-related clips I need to replace before reassembly. I have tried (gently) to remove the tweeter grilles (sort of rounded off triangles) and they don't seem easy to remove - didn't want to break anything.

And does anyone know how the OEM door speakers and tweeters are wired? Just wondering whether to remove the existing wiring or re-use it, is there a crossover somewhere? (I would need to replace it with the one from the new speakers if so).

Any and all input would be much appreciated!

Thanks

Paul