Hi,

You do need some wiring. Your current radio/nav receives all its data over the ibus - a single wire.


With a colour screen, you need to feed it the RGB video signal, which is done on 3 x coax cables.

These cables fron from the blue connector on the nav unit to the blue connector on the on-board monitor (screen)

Essentially, to make your system work you need to:
1. Re-code your existing nav unit from mono-screen to colour screen (enables the video outputs); OR buy a newer version nav already coded for a colour screen. A Mk3 or Mk4 has the GPS receiver built in, so the GPS antena unplugs from your separate GPS receiver and connects to the Mk3 or Mk4 nav computer.

2. Run 3 x 75-ohm coax cables from the nav computer to the bordmonitor. Fit the cable into the existing connectors. you'll need to buy some pins to do so, or get an old plug from a wreckers, and reuse the pins.

3. Run a bordmonitor ground wire from the nav computer to the bordmonitor. This ensures the screen and nav share a common ground

4. You may also need to cable the other white plug for the bordmonitor - refer to the retrofit instructions to determine all the wires, their colours and their functions.

All in all achievable, but you'll have to run your own cables. BMW did not, I believe, make a retrofit kit to do what you want to do.

Jochen