Citroen c5 mk3 2009 aftermarket in-dash sat nav compatibility

[GiveMeABreak]

In short yes.

You can't just go plugging in anything and expect it to work. Depending on the system you have (again, as per your other post, we'll need a VIN) you may loose vehicle option functionality completely, so don't expect parking assistance to work or to be able to change options (system dependent), plus you will need harnesses and may loose controls of the steering wheel functions too.

A green line usually signifies the display screen has failed or the connection has been upset between the head unit and the screen. - What the heck did they clean the unit with - Battery acid? Is it possible they have got liquid spray into the head unit???

[GiveMeABreak]

Ok, so a VIN will help in the meantime so I can determine exactly what you have.