installing Android radio in Astra J Sports Tourer

[martinl88]

Well, now I'm exactly in the same position as OP.

Original CD500 panel lights up but all the button's functions are messed up (as expected).
When I connect a CD400 panel, then nothing happens (seems to be also an expected behavior).

Tried one of the tips shared here - cutting the purple wire from the display and connecting it to the second empty pin slot at the connector plug. Didn't work. Panel still doesn't light up.
Also, the new HU's wiring loom has a single purple wire with a connector. Another end of that goes to the CANBUS box.
On different pictures I've found over the internet, it seems to be connected with one of the display connectors. Looking more closely I discovered that it's exactly the same purple wire that I should cut to get the panel working.

Conflicting information, so to speak.

You need to swap wires around between the screen and control panel & also at the main radio plug.

That's great! So you just replaced CD500 button panel with CD400 button panel? You didnt use the CD500 wirebox with canbus that the seller sent you?

Wiring changes has to be made.

The cd400 is wired totally different to the rest you need to make your wiring match a cd400.

The cd400 buttons will then work, you can't make the changes and expect a cd500 control panel to work.

Is there some kind of guide available, on what to change and where?