Cd400 to nav500 upgrade.

[tucpal]

this is the problem with the insignia if you also have the armrest controller on the nav 500 already
then you would be disabling it also by adding the cd400 controls as the cd400 in the insignia never had armrest controls
it can be retro fitted though this will give you an idaea how to do it

https://www.youtube.com/watch?v=60lx_Nec_yI

rusty may be able to work it out by the youtube clip

or you could ask on insignia es forum they may help