So, after much trail and error I have managed to replace my APIM (with one I got off ebay for a couple of hundred quid) and now have the factory navigation up and running with F7 maps
So for anyone else in future looking for how to do this, here you go:
- Drop the glovebox by pushing in on the retainers with a flat screwdriver, I found it easier to release the right-hand side first
- Above the glovebox behind the airbag, the APIM is located on a metal shelf, the shelf is held up by two 10mm nuts
- Reach up into the void and undo the two nuts, you can then drop down the whole thing and unscrew the APIM from the its mount (if you have enough slack on the cables)
If you need more slack on the cables, you have to remove the screen and dash section
- Using a plastic pry tool, remove the cover behind the screen and undo the three hex screws
- Lift screen away and disconnect the cables
- Remove the two hex screws holding the piano black dash
- The dash and then be gently pried off by pulling the right side and using a pry tool at the edge, working round with left side coming away last (I did this twice and seems the best way)
- You can now disconnect/unclip the cables to the APIM to gain some slack